| dnl Process this file with autoconf to produce a configure script. |
| dnl Note we do not use AC_PREREQ here! See aclocal.m4 for what we use instead. |
| AC_INIT([GNU C Library], [(see version.h)], [https://sourceware.org/bugzilla/], [glibc]) |
| AC_CONFIG_SRCDIR([include/features.h]) |
| AC_CONFIG_HEADERS([config.h]) |
| AC_CONFIG_AUX_DIR([scripts]) |
| |
| ACX_PKGVERSION([GNU libc]) |
| ACX_BUGURL([http://www.gnu.org/software/libc/bugs.html]) |
| AC_DEFINE_UNQUOTED([PKGVERSION], ["$PKGVERSION"], |
| [Package description]) |
| AC_DEFINE_UNQUOTED([REPORT_BUGS_TO], ["$REPORT_BUGS_TO"], |
| [Bug reporting address]) |
| |
| # Glibc should not depend on any header files |
| AC_DEFUN([_AC_INCLUDES_DEFAULT_REQUIREMENTS], |
| [m4_divert_text([DEFAULTS], |
| [ac_includes_default='/* none */'])]) |
| |
| # We require GCC, and by default use its preprocessor. Override AC_PROG_CPP |
| # here to work around the Autoconf issue discussed in |
| # <https://sourceware.org/ml/libc-alpha/2013-01/msg00721.html>. |
| AC_DEFUN([AC_PROG_CPP], |
| [AC_REQUIRE([AC_PROG_CC])dnl |
| AC_ARG_VAR([CPP], [C preprocessor])dnl |
| _AC_ARG_VAR_CPPFLAGS()dnl |
| # On Suns, sometimes $CPP names a directory. |
| if test -n "$CPP" && test -d "$CPP"; then |
| CPP= |
| fi |
| if test -z "$CPP"; then |
| CPP="$CC -E" |
| fi |
| AC_SUBST(CPP)dnl |
| ])# AC_PROG_CPP |
| |
| # We require GCC. Override _AC_PROG_CC_C89 here to work around the Autoconf |
| # issue discussed in |
| # <https://sourceware.org/ml/libc-alpha/2013-01/msg00757.html>. |
| AC_DEFUN([_AC_PROG_CC_C89], [[$1]]) |
| |
| dnl This is here so we can set $subdirs directly based on configure fragments. |
| AC_CONFIG_SUBDIRS() |
| |
| AC_CANONICAL_HOST |
| |
| AC_PROG_CC |
| if test $host != $build; then |
| AC_CHECK_PROGS(BUILD_CC, gcc cc) |
| fi |
| AC_SUBST(cross_compiling) |
| AC_PROG_CPP |
| AC_CHECK_TOOL(READELF, readelf, false) |
| |
| # We need the C++ compiler only for testing. |
| AC_PROG_CXX |
| # It's useless to us if it can't link programs (e.g. missing -lstdc++). |
| AC_CACHE_CHECK([whether $CXX can link programs], libc_cv_cxx_link_ok, [dnl |
| AC_LANG_PUSH([C++]) |
| # Default, dynamic case. |
| AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])], |
| [libc_cv_cxx_link_ok=yes], |
| [libc_cv_cxx_link_ok=no]) |
| # Static case. |
| old_LDFLAGS="$LDFLAGS" |
| LDFLAGS="$LDFLAGS -static" |
| AC_LINK_IFELSE([AC_LANG_SOURCE([ |
| #include <iostream> |
| |
| int |
| main() |
| { |
| std::cout << "Hello, world!"; |
| return 0; |
| } |
| ])], |
| [], |
| [libc_cv_cxx_link_ok=no]) |
| LDFLAGS="$old_LDFLAGS" |
| AC_LANG_POP([C++])]) |
| AS_IF([test $libc_cv_cxx_link_ok != yes], [CXX=]) |
| |
| if test "`cd $srcdir; pwd -P`" = "`pwd -P`"; then |
| AC_MSG_ERROR([you must configure in a separate build directory]) |
| fi |
| |
| # This will get text that should go into config.make. |
| config_vars= |
| |
| # Check for a --with-gd argument and set libgd-LDFLAGS in config.make. |
| AC_ARG_WITH([gd], |
| AC_HELP_STRING([--with-gd=DIR], |
| [find libgd include dir and library with prefix DIR]), |
| [dnl |
| case "$with_gd" in |
| yes|''|no) ;; |
| *) libgd_include="-I$withval/include" |
| libgd_ldflags="-L$withval/lib" ;; |
| esac |
| ]) |
| AC_ARG_WITH([gd-include], |
| AC_HELP_STRING([--with-gd-include=DIR], |
| [find libgd include files in DIR]), |
| [dnl |
| case "$with_gd_include" in |
| ''|no) ;; |
| *) libgd_include="-I$withval" ;; |
| esac |
| ]) |
| AC_ARG_WITH([gd-lib], |
| AC_HELP_STRING([--with-gd-lib=DIR], |
| [find libgd library files in DIR]), |
| [dnl |
| case "$with_gd_lib" in |
| ''|no) ;; |
| *) libgd_ldflags="-L$withval" ;; |
| esac |
| ]) |
| |
| if test -n "$libgd_include"; then |
| config_vars="$config_vars |
| CFLAGS-memusagestat.c = $libgd_include" |
| fi |
| if test -n "$libgd_ldflags"; then |
| config_vars="$config_vars |
| libgd-LDFLAGS = $libgd_ldflags" |
| fi |
| |
| dnl Arguments to specify presence of other packages/features. |
| AC_ARG_WITH([binutils], |
| AC_HELP_STRING([--with-binutils=PATH], |
| [specify location of binutils (as and ld)]), |
| [path_binutils=$withval], |
| [path_binutils='']) |
| AC_ARG_WITH([selinux], |
| AC_HELP_STRING([--with-selinux], |
| [if building with SELinux support]), |
| [with_selinux=$withval], |
| [with_selinux=auto]) |
| dnl This is a temporary hack, to help sort out wired-in GCC assumptions. |
| AC_ARG_WITH([clang], |
| AC_HELP_STRING([--with-clang], |
| [if building with clang (temporary)]), |
| [with_clang=$withval], |
| [with_clang=no]) |
| LIBC_CONFIG_VAR([with-clang], [$with_clang]) |
| dnl This is a temporary hack, to help with BFD LD vs LLD debugging. |
| AC_ARG_WITH([lld], |
| AC_HELP_STRING([--with-lld], |
| [if building/linking with lld (temporary)]), |
| [with_lld=$withval], |
| [with_lld=no]) |
| LIBC_CONFIG_VAR([with-lld], [$with_lld]) |
| |
| AC_ARG_WITH([headers], |
| AC_HELP_STRING([--with-headers=PATH], |
| [location of system headers to use |
| (for example /usr/src/linux/include) |
| @<:@default=compiler default@:>@]), |
| [sysheaders=$withval], |
| [sysheaders='']) |
| AC_SUBST(sysheaders) |
| |
| AC_SUBST(use_default_link) |
| AC_ARG_WITH([default-link], |
| AC_HELP_STRING([--with-default-link], |
| [do not use explicit linker scripts]), |
| [use_default_link=$withval], |
| [use_default_link=default]) |
| |
| AC_ARG_ENABLE([sanity-checks], |
| AC_HELP_STRING([--disable-sanity-checks], |
| [really do not use threads (should not be used except in special situations) @<:@default=yes@:>@]), |
| [enable_sanity=$enableval], |
| [enable_sanity=yes]) |
| |
| AC_ARG_ENABLE([shared], |
| AC_HELP_STRING([--enable-shared], |
| [build shared library @<:@default=yes if GNU ld@:>@]), |
| [shared=$enableval], |
| [shared=yes]) |
| AC_ARG_ENABLE([profile], |
| AC_HELP_STRING([--enable-profile], |
| [build profiled library @<:@default=no@:>@]), |
| [profile=$enableval], |
| [profile=no]) |
| AC_ARG_ENABLE([static-pie], |
| AC_HELP_STRING([--enable-static-pie], |
| [enable static PIE support and use it in the testsuite @<:@default=no@:>@]), |
| [static_pie=$enableval], |
| [static_pie=no]) |
| AC_ARG_ENABLE([timezone-tools], |
| AC_HELP_STRING([--disable-timezone-tools], |
| [do not install timezone tools @<:@default=install@:>@]), |
| [enable_timezone_tools=$enableval], |
| [enable_timezone_tools=yes]) |
| AC_SUBST(enable_timezone_tools) |
| |
| AC_ARG_ENABLE([hardcoded-path-in-tests], |
| AC_HELP_STRING([--enable-hardcoded-path-in-tests], |
| [hardcode newly built glibc path in tests @<:@default=no@:>@]), |
| [hardcoded_path_in_tests=$enableval], |
| [hardcoded_path_in_tests=no]) |
| AC_SUBST(hardcoded_path_in_tests) |
| |
| AC_ARG_ENABLE([stackguard-randomization], |
| AC_HELP_STRING([--enable-stackguard-randomization], |
| [initialize __stack_chk_guard canary with a random number at program start]), |
| [enable_stackguard_randomize=$enableval], |
| [enable_stackguard_randomize=no]) |
| if test "$enable_stackguard_randomize" = yes; then |
| AC_DEFINE(ENABLE_STACKGUARD_RANDOMIZE) |
| fi |
| |
| AC_ARG_ENABLE([hidden-plt], |
| AC_HELP_STRING([--disable-hidden-plt], |
| [do not hide internal function calls to avoid PLT]), |
| [hidden=$enableval], |
| [hidden=yes]) |
| if test "x$hidden" = xno; then |
| AC_DEFINE(NO_HIDDEN) |
| fi |
| |
| AC_ARG_ENABLE([bind-now], |
| AC_HELP_STRING([--enable-bind-now], |
| [disable lazy relocations in DSOs]), |
| [bindnow=$enableval], |
| [bindnow=no]) |
| AC_SUBST(bindnow) |
| if test "x$bindnow" = xyes; then |
| AC_DEFINE(BIND_NOW) |
| fi |
| |
| dnl Build glibc with -fstack-protector, -fstack-protector-all, or |
| dnl -fstack-protector-strong. |
| AC_ARG_ENABLE([stack-protector], |
| AC_HELP_STRING([--enable-stack-protector=@<:@yes|no|all|strong@:>@], |
| [Use -fstack-protector[-all|-strong] to detect glibc buffer overflows]), |
| [enable_stack_protector=$enableval], |
| [enable_stack_protector=no]) |
| case "$enable_stack_protector" in |
| all|yes|no|strong) ;; |
| *) AC_MSG_ERROR([Not a valid argument for --enable-stack-protector: \"$enable_stack_protector\"]);; |
| esac |
| |
| dnl On some platforms we cannot use dynamic loading. We must provide |
| dnl static NSS modules. |
| AC_ARG_ENABLE([static-nss], |
| AC_HELP_STRING([--enable-static-nss], |
| [build static NSS modules @<:@default=no@:>@]), |
| [static_nss=$enableval], |
| [static_nss=no]) |
| dnl Enable static NSS also if we build no shared objects. |
| if test x"$static_nss" = xyes || test x"$shared" = xno; then |
| static_nss=yes |
| AC_DEFINE(DO_STATIC_NSS) |
| fi |
| |
| AC_ARG_ENABLE([force-install], |
| AC_HELP_STRING([--disable-force-install], |
| [don't force installation of files from this package, even if they are older than the installed files]), |
| [force_install=$enableval], |
| [force_install=yes]) |
| AC_SUBST(force_install) |
| |
| AC_ARG_ENABLE([maintainer-mode], |
| AC_HELP_STRING([--enable-maintainer-mode], |
| [enable make rules and dependencies not useful (and sometimes confusing) to the casual installer]), |
| [maintainer=$enableval], |
| [maintainer=no]) |
| |
| dnl On some platforms we allow dropping compatibility with all kernel |
| dnl versions. |
| AC_ARG_ENABLE([kernel], |
| AC_HELP_STRING([--enable-kernel=VERSION], |
| [compile for compatibility with kernel not older than VERSION]), |
| [minimum_kernel=$enableval], |
| []) |
| dnl Prevent unreasonable values. |
| if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then |
| # Better nothing than this. |
| minimum_kernel="" |
| else |
| if test "$minimum_kernel" = current; then |
| minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel= |
| fi |
| fi |
| |
| dnl For the development we sometimes want gcc to issue even more warnings. |
| dnl This is not the default since many of the extra warnings are not |
| dnl appropriate. |
| AC_ARG_ENABLE([all-warnings], |
| AC_HELP_STRING([--enable-all-warnings], |
| [enable all useful warnings gcc can issue]), |
| [all_warnings=$enableval], |
| []) |
| AC_SUBST(all_warnings) |
| |
| AC_ARG_ENABLE([werror], |
| AC_HELP_STRING([--disable-werror], |
| [do not build with -Werror]), |
| [enable_werror=$enableval], |
| [enable_werror=yes]) |
| AC_SUBST(enable_werror) |
| |
| AC_ARG_ENABLE([multi-arch], |
| AC_HELP_STRING([--enable-multi-arch], |
| [enable single DSO with optimizations for multiple architectures]), |
| [multi_arch=$enableval], |
| [multi_arch=default]) |
| |
| AC_ARG_ENABLE([experimental-malloc], |
| AC_HELP_STRING([--disable-experimental-malloc], |
| [disable experimental malloc features]), |
| [experimental_malloc=$enableval], |
| [experimental_malloc=yes]) |
| AC_SUBST(experimental_malloc) |
| |
| AC_ARG_ENABLE([nss-crypt], |
| AC_HELP_STRING([--enable-nss-crypt], |
| [enable libcrypt to use nss]), |
| [nss_crypt=$enableval], |
| [nss_crypt=no]) |
| if test x$nss_crypt = xyes; then |
| nss_includes=-I$(nss-config --includedir 2>/dev/null) |
| if test $? -ne 0; then |
| AC_MSG_ERROR([cannot find include directory with nss-config]) |
| fi |
| nspr_includes=-I$(nspr-config --includedir 2>/dev/null) |
| if test $? -ne 0; then |
| AC_MSG_ERROR([cannot find include directory with nspr-config]) |
| fi |
| old_CFLAGS="$CFLAGS" |
| CFLAGS="$CFLAGS $nss_includes $nspr_includes" |
| AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool; |
| #include <hasht.h> |
| #include <nsslowhash.h> |
| void f (void) { NSSLOW_Init (); }])], |
| libc_cv_nss_crypt=yes, |
| AC_MSG_ERROR([ |
| cannot find NSS headers with lowlevel hash function interfaces])) |
| old_LIBS="$LIBS" |
| old_LDFLAGS="$LDFLAGS" |
| LIBS="$LIBS -lfreebl3" |
| AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool; |
| #include <hasht.h> |
| #include <nsslowhash.h>], |
| [NSSLOW_Init();])], |
| libc_cv_nss_crypt=yes, |
| AC_MSG_ERROR([ |
| cannot link program using lowlevel NSS hash functions])) |
| # Check to see if there is a static NSS cryptographic library. |
| # If there isn't then we can't link anything with libcrypt.a, |
| # and that might mean disabling some static tests. |
| LDFLAGS="$LDFLAGS -static" |
| AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool; |
| #include <hasht.h> |
| #include <nsslowhash.h>], |
| [NSSLOW_Init();])], |
| libc_cv_static_nss_crypt=yes, |
| libc_cv_static_nss_crypt=no) |
| LDFLAGS="$old_LDFLAGS" |
| CFLAGS="$old_CFLAGS" |
| LIBS="$old_LIBS" |
| else |
| libc_cv_nss_crypt=no |
| libc_cv_static_nss_crypt=no |
| fi |
| AC_SUBST(libc_cv_nss_crypt) |
| AC_SUBST(libc_cv_static_nss_crypt) |
| |
| |
| AC_ARG_ENABLE([obsolete-rpc], |
| AC_HELP_STRING([--enable-obsolete-rpc], |
| [build and install the obsolete RPC code for link-time usage]), |
| [link_obsolete_rpc=$enableval], |
| [link_obsolete_rpc=no]) |
| AC_SUBST(link_obsolete_rpc) |
| |
| if test "$link_obsolete_rpc" = yes; then |
| AC_DEFINE(LINK_OBSOLETE_RPC) |
| fi |
| |
| AC_ARG_ENABLE([obsolete-nsl], |
| AC_HELP_STRING([--enable-obsolete-nsl], |
| [build and install the obsolete libnsl library and depending NSS modules]), |
| [build_obsolete_nsl=$enableval], |
| [build_obsolete_nsl=no]) |
| AC_SUBST(build_obsolete_nsl) |
| |
| if test "$build_obsolete_nsl" = yes; then |
| AC_DEFINE(LINK_OBSOLETE_NSL) |
| fi |
| |
| AC_ARG_ENABLE([systemtap], |
| [AS_HELP_STRING([--enable-systemtap], |
| [enable systemtap static probe points @<:@default=no@:>@])], |
| [systemtap=$enableval], |
| [systemtap=no]) |
| if test "x$systemtap" != xno; then |
| AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl |
| old_CFLAGS="$CFLAGS" |
| CFLAGS="-std=gnu11 $CFLAGS" |
| AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h> |
| void foo (int i, void *p) |
| { |
| asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) "" |
| :: STAP_PROBE_ASM_OPERANDS (2, i, p)); |
| }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no]) |
| CFLAGS="$old_CFLAGS"]) |
| if test $libc_cv_sdt = yes; then |
| AC_DEFINE([USE_STAP_PROBE]) |
| elif test "x$systemtap" != xauto; then |
| AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support]) |
| fi |
| fi |
| |
| AC_ARG_ENABLE([build-nscd], |
| [AS_HELP_STRING([--disable-build-nscd], |
| [disable building and installing the nscd daemon])], |
| [build_nscd=$enableval], |
| [build_nscd=default]) |
| AC_SUBST(build_nscd) |
| |
| # Note the use of $use_nscd is near the bottom of the file. |
| AC_ARG_ENABLE([nscd], |
| [AS_HELP_STRING([--disable-nscd], |
| [library functions will not contact the nscd daemon])], |
| [use_nscd=$enableval], |
| [use_nscd=yes]) |
| |
| AC_ARG_ENABLE([pt_chown], |
| [AS_HELP_STRING([--enable-pt_chown], |
| [Enable building and installing pt_chown])], |
| [build_pt_chown=$enableval], |
| [build_pt_chown=no]) |
| AC_SUBST(build_pt_chown) |
| if test "$build_pt_chown" = yes; then |
| AC_DEFINE(HAVE_PT_CHOWN) |
| fi |
| |
| AC_ARG_ENABLE([tunables], |
| [AS_HELP_STRING([--enable-tunables], |
| [Enable tunables support. Known values are 'yes', 'no' and 'valstring'])], |
| [have_tunables=$enableval], |
| [have_tunables=yes]) |
| AC_SUBST(have_tunables) |
| if test "$have_tunables" = yes; then |
| AC_DEFINE(HAVE_TUNABLES) |
| fi |
| |
| AC_ARG_ENABLE([float128], |
| AC_HELP_STRING([--disable-float128], |
| [disable float128 support]), |
| [enable_float128=$enableval], |
| [enable_float128=yes]) |
| AC_SUBST(enable_float128) |
| if test "$enable_float128" = yes; then |
| AC_DEFINE(WANT_FLOAT128) |
| fi |
| |
| # The abi-tags file uses a fairly simplistic model for name recognition that |
| # can't distinguish i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a |
| # $host_os of `gnu*' here to be `gnu-gnu*' just so that it can tell. |
| # This doesn't get used much beyond that, so it's fairly safe. |
| case "$host_os" in |
| linux*) |
| ;; |
| gnu*) |
| host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'` |
| ;; |
| esac |
| |
| AC_ARG_ENABLE([mathvec], |
| [AS_HELP_STRING([--enable-mathvec], |
| [Enable building and installing mathvec @<:@default depends on architecture@:>@])], |
| [build_mathvec=$enableval], |
| [build_mathvec=notset]) |
| |
| # We keep the original values in `$config_*' and never modify them, so we |
| # can write them unchanged into config.make. Everything else uses |
| # $machine, $vendor, and $os, and changes them whenever convenient. |
| config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os |
| |
| # Don't allow vendor == "unknown" |
| test "$config_vendor" = unknown && config_vendor= |
| config_os="`echo $config_os | sed 's/^unknown-//'`" |
| |
| # Some configurations imply other options. |
| elf=yes |
| |
| # The configure fragment of a port can modify these to supplement |
| # or override the table in the case statement below. No fragment should |
| # ever change the config_* variables, however. |
| machine=$config_machine |
| vendor=$config_vendor |
| os=$config_os |
| base_os='' |
| |
| submachine= |
| AC_ARG_WITH([cpu], |
| AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]), |
| [dnl |
| case "$withval" in |
| yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;; |
| no) ;; |
| *) submachine="$withval" ;; |
| esac |
| ]) |
| |
| # An preconfigure script can set this when it wants to disable the sanity |
| # check below. |
| libc_config_ok=no |
| |
| # A preconfigure script for a system that may or may not use fpu |
| # sysdeps directories sets this to a preprocessor conditional for |
| # whether to use such directories. |
| with_fp_cond=1 |
| |
| dnl Let sysdeps/*/preconfigure act here. |
| LIBC_PRECONFIGURE([$srcdir], [for sysdeps]) |
| |
| |
| ### |
| ### By using the undocumented --enable-hacker-mode option for configure |
| ### one can skip this test to make the configuration not fail for unsupported |
| ### platforms. |
| ### |
| if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then |
| case "$machine-$host_os" in |
| *-linux* | *-gnu*) |
| ;; |
| *) |
| AC_MSG_ERROR([ |
| *** The GNU C library is currently unavailable for this platform. |
| *** If you are interested in seeing glibc on this platform visit |
| *** the "How to submit a new port" in the wiki: |
| *** https://sourceware.org/glibc/wiki/#Development |
| *** and join the community!]) |
| ;; |
| esac |
| fi |
| |
| # Set base_machine if not set by a preconfigure fragment. |
| test -n "$base_machine" || base_machine=$machine |
| AC_SUBST(base_machine) |
| |
| # Determine whether to use fpu or nofpu sysdeps directories. |
| AC_CACHE_CHECK([for use of fpu sysdeps directories], |
| libc_cv_with_fp, [dnl |
| cat > conftest.c <<EOF |
| #if $with_fp_cond |
| int dummy; |
| #else |
| # error "no hardware floating point" |
| #endif |
| EOF |
| libc_cv_with_fp=no |
| if ${CC-cc} $CFLAGS $CPPFLAGS -S conftest.c -o conftest.s \ |
| 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD ; then |
| libc_cv_with_fp=yes |
| fi |
| rm -f conftest*]) |
| AC_SUBST(libc_cv_with_fp) |
| |
| AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl |
| LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector], |
| [libc_cv_ssp=yes], |
| [libc_cv_ssp=no]) |
| ]) |
| |
| AC_CACHE_CHECK(for -fstack-protector-strong, libc_cv_ssp_strong, [dnl |
| LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-strong], |
| [libc_cv_ssp_strong=yes], |
| [libc_cv_ssp_strong=no]) |
| ]) |
| |
| AC_CACHE_CHECK(for -fstack-protector-all, libc_cv_ssp_all, [dnl |
| LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-all], |
| [libc_cv_ssp_all=yes], |
| [libc_cv_ssp_all=no]) |
| ]) |
| |
| stack_protector= |
| no_stack_protector= |
| if test "$libc_cv_ssp" = yes; then |
| no_stack_protector="-fno-stack-protector -DSTACK_PROTECTOR_LEVEL=0" |
| AC_DEFINE(HAVE_CC_NO_STACK_PROTECTOR) |
| fi |
| |
| if test "$enable_stack_protector" = yes && test "$libc_cv_ssp" = yes; then |
| stack_protector="-fstack-protector" |
| AC_DEFINE(STACK_PROTECTOR_LEVEL, 1) |
| elif test "$enable_stack_protector" = all && test "$libc_cv_ssp_all" = yes; then |
| stack_protector="-fstack-protector-all" |
| AC_DEFINE(STACK_PROTECTOR_LEVEL, 2) |
| elif test "$enable_stack_protector" = strong && test "$libc_cv_ssp_strong" = yes; then |
| stack_protector="-fstack-protector-strong" |
| AC_DEFINE(STACK_PROTECTOR_LEVEL, 3) |
| else |
| stack_protector="-fno-stack-protector" |
| AC_DEFINE(STACK_PROTECTOR_LEVEL, 0) |
| fi |
| AC_SUBST(libc_cv_ssp) |
| AC_SUBST(stack_protector) |
| AC_SUBST(no_stack_protector) |
| |
| if test -n "$stack_protector"; then |
| dnl Don't run configure tests with stack-protection on, to avoid problems with |
| dnl bootstrapping. |
| no_ssp=-fno-stack-protector |
| else |
| no_ssp= |
| |
| if test "$enable_stack_protector" != no; then |
| AC_MSG_ERROR([--enable-stack-protector=$enable_stack_protector specified, but specified level of stack protection is not supported by the compiler.]) |
| fi |
| fi |
| |
| # For the multi-arch option we need support in the assembler & linker. |
| AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support], |
| libc_cv_ld_gnu_indirect_function, [dnl |
| cat > conftest.S <<EOF |
| .type foo,%gnu_indirect_function |
| foo: |
| .globl _start |
| _start: |
| .globl __start |
| __start: |
| .data |
| #ifdef _LP64 |
| .quad foo |
| #else |
| .long foo |
| #endif |
| EOF |
| libc_cv_ld_gnu_indirect_function=no |
| if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \ |
| -nostartfiles -nostdlib $no_ssp \ |
| -o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then |
| # Do a link to see if the backend supports IFUNC relocs. |
| $READELF -r conftest 1>&AS_MESSAGE_LOG_FD |
| LC_ALL=C $READELF -r conftest | grep 'no relocations' >/dev/null || { |
| libc_cv_ld_gnu_indirect_function=yes |
| } |
| fi |
| rm -f conftest*]) |
| |
| # Check if gcc supports attribute ifunc as it is used in libc_ifunc macro. |
| AC_CACHE_CHECK([for gcc attribute ifunc support], |
| libc_cv_gcc_indirect_function, [dnl |
| cat > conftest.c <<EOF |
| extern int func (int); |
| int used_func (int a) |
| { |
| return a; |
| } |
| static void *resolver () |
| { |
| return &used_func; |
| } |
| extern __typeof (func) func __attribute__ ((ifunc ("resolver"))); |
| EOF |
| libc_cv_gcc_indirect_function=no |
| if ${CC-cc} -c conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD \ |
| 2>&AS_MESSAGE_LOG_FD ; then |
| if $READELF -s conftest.o | grep IFUNC >/dev/null 2>&AS_MESSAGE_LOG_FD; then |
| libc_cv_gcc_indirect_function=yes |
| fi |
| fi |
| rm -f conftest*]) |
| |
| # Check if gcc warns about alias for function with incompatible types. |
| AC_CACHE_CHECK([if compiler warns about alias for function with incompatible types], |
| libc_cv_gcc_incompatible_alias, [dnl |
| cat > conftest.c <<EOF |
| int __redirect_foo (const void *s, int c); |
| |
| __typeof (__redirect_foo) *foo_impl (void) __asm__ ("foo"); |
| __typeof (__redirect_foo) *foo_impl (void) |
| { |
| return 0; |
| } |
| |
| extern __typeof (__redirect_foo) foo_alias __attribute__ ((alias ("foo"))); |
| EOF |
| libc_cv_gcc_incompatible_alias=yes |
| if ${CC-cc} -Werror -c conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD ; then |
| libc_cv_gcc_incompatible_alias=no |
| fi |
| rm -f conftest*]) |
| |
| if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then |
| if test x"$multi_arch" = xyes; then |
| AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support]) |
| else |
| multi_arch=no |
| fi |
| fi |
| if test x"$libc_cv_gcc_indirect_function" != xyes; then |
| # GCC 8+ emits a warning for alias with incompatible types and it might |
| # fail to build ifunc resolvers aliases to either weak or internal |
| # symbols. Disables multiarch build in this case. |
| if test x"$libc_cv_gcc_incompatible_alias" == xyes; then |
| AC_MSG_WARN([gcc emits a warning for alias between functions of incompatible types]) |
| if test x"$multi_arch" = xyes; then |
| AC_MSG_ERROR([--enable-multi-arch support requires a gcc with gnu-indirect-function support]) |
| fi |
| AC_MSG_WARN([Multi-arch is disabled.]) |
| multi_arch=no |
| elif test x"$multi_arch" = xyes; then |
| AC_MSG_WARN([--enable-multi-arch support recommends a gcc with gnu-indirect-function support. |
| Please use a gcc which supports it by default or configure gcc with --enable-gnu-indirect-function]) |
| fi |
| fi |
| multi_arch_d= |
| if test x"$multi_arch" != xno; then |
| multi_arch_d=/multiarch |
| fi |
| |
| # Compute the list of sysdep directories for this configuration. |
| # This can take a while to compute. |
| sysdep_dir=$srcdir/sysdeps |
| AC_MSG_CHECKING(sysdep dirs) |
| dnl We need to use [ and ] for other purposes for a while now. |
| changequote(,)dnl |
| # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1. |
| os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`" |
| |
| test "x$base_os" != x || case "$os" in |
| gnu*) |
| base_os=mach/hurd ;; |
| linux*) |
| base_os=unix/sysv ;; |
| esac |
| |
| # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos. |
| tail=$os |
| ostry=$os |
| while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do |
| ostry="$ostry /$o" |
| tail=$o |
| done |
| o=`echo $tail | sed 's/[0-9]*$//'` |
| if test $o != $tail; then |
| ostry="$ostry /$o" |
| fi |
| # For linux-gnu, try linux-gnu, then linux. |
| o=`echo $tail | sed 's/-.*$//'` |
| if test $o != $tail; then |
| ostry="$ostry /$o" |
| fi |
| |
| # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix. |
| base= |
| tail=$base_os |
| while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do |
| set $b |
| base="$base /$1" |
| tail="$2" |
| done |
| |
| # For sparc/sparc32, try sparc/sparc32 and then sparc. |
| mach= |
| tail=$machine${submachine:+/$submachine} |
| while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do |
| set $m |
| # Prepend the machine's FPU directory unless --without-fp. |
| if test "$libc_cv_with_fp" = yes; then |
| maybe_fpu=/fpu |
| else |
| maybe_fpu=/nofpu |
| fi |
| # For each machine term, try it with and then without /multiarch. |
| for try_fpu in $maybe_fpu ''; do |
| for try_multi in $multi_arch_d ''; do |
| mach="$mach /$1$try_fpu$try_multi" |
| done |
| done |
| tail="$2" |
| done |
| |
| dnl We are done with glob and regexp uses of [ and ]; return to autoconf. |
| changequote([,])dnl |
| |
| # Find what sysdep directories exist. |
| sysnames= |
| for b in $base ''; do |
| for m0 in $mach ''; do |
| for v in /$vendor ''; do |
| test "$v" = / && continue |
| for o in /$ostry ''; do |
| test "$o" = / && continue |
| for m in $mach ''; do |
| try_suffix="$m0$b$v$o$m" |
| if test -n "$try_suffix"; then |
| try_srcdir="${srcdir}/" |
| try="sysdeps$try_suffix" |
| test -n "$enable_debug_configure" && |
| echo "$0 [DEBUG]: try $try" >&2 |
| if test -d "$try_srcdir$try"; then |
| sysnames="$sysnames $try" |
| { test -n "$o" || test -n "$b"; } && os_used=t |
| { test -n "$m" || test -n "$m0"; } && machine_used=t |
| case x${m0:-$m} in |
| x*/$submachine) submachine_used=t ;; |
| esac |
| fi |
| fi |
| done |
| done |
| done |
| done |
| done |
| |
| # If the assembler supports gnu_indirect_function symbol type and the |
| # architecture supports multi-arch, we enable multi-arch by default. |
| case $sysnames in |
| *"$multi_arch_d"*) |
| ;; |
| *) |
| test x"$multi_arch" = xdefault && multi_arch=no |
| ;; |
| esac |
| if test x"$multi_arch" != xno; then |
| AC_DEFINE(USE_MULTIARCH) |
| fi |
| AC_SUBST(multi_arch) |
| |
| if test -z "$os_used" && test "$os" != none; then |
| AC_MSG_ERROR(Operating system $os is not supported.) |
| fi |
| if test -z "$machine_used" && test "$machine" != none; then |
| AC_MSG_ERROR(The $machine is not supported.) |
| fi |
| if test -z "$submachine_used" && test -n "$submachine"; then |
| AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.) |
| fi |
| AC_SUBST(submachine) |
| |
| # We have now validated the configuration. |
| |
| # Expand the list of system names into a full list of directories |
| # from each element's parent name and Implies file (if present). |
| set $sysnames |
| names= |
| while test $# -gt 0; do |
| name=$1 |
| shift |
| |
| case " $names " in *" $name "*) |
| # Already in the list. |
| continue |
| esac |
| |
| # Report each name as we discover it, so there is no long pause in output. |
| echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD |
| |
| name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'` |
| |
| case $name in |
| /*) xsrcdir= ;; |
| *) xsrcdir=$srcdir/ ;; |
| esac |
| test -n "$enable_debug_configure" && |
| echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2 |
| |
| for implies_file in Implies Implies-before Implies-after; do |
| implies_type=`echo $implies_file | sed s/-/_/` |
| eval ${implies_type}= |
| if test -f $xsrcdir$name/$implies_file; then |
| # Collect more names from the `Implies' file (removing comments). |
| implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`" |
| for x in $implied_candidate; do |
| found=no |
| if test -d $xsrcdir$name_base/$x; then |
| eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\"" |
| found=yes |
| fi |
| try="sysdeps/$x" |
| try_srcdir=$srcdir/ |
| test -n "$enable_debug_configure" && |
| echo "[DEBUG]: $name $implies_file $x try() {$try_srcdir}$try" >&2 |
| if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try; |
| then |
| eval "${implies_type}=\"\$${implies_type} \$try\"" |
| found=yes |
| fi |
| if test $found = no; then |
| AC_MSG_WARN($name/$implies_file specifies nonexistent $x) |
| fi |
| done |
| fi |
| done |
| |
| # Add NAME to the list of names. |
| names="$names $name" |
| |
| # Find the parent of NAME, using the empty string if it has none. |
| changequote(,)dnl |
| parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`" |
| changequote([,])dnl |
| |
| test -n "$enable_debug_configure" && |
| echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \ |
| Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2 |
| |
| # Add the names implied by NAME, and NAME's parent (if it has one), to |
| # the list of names to be processed (the argument list). We prepend the |
| # implied names to the list and append the parent. We want implied |
| # directories to come before further directories inferred from the |
| # configuration components; this ensures that for sysv4, unix/common |
| # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*) |
| # after sysv4). |
| sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`" |
| test -n "$sysnames" && set $sysnames |
| done |
| |
| # Add the default directories. |
| default_sysnames="sysdeps/generic" |
| sysnames="$names $default_sysnames" |
| AC_SUBST(sysnames) |
| # The other names were emitted during the scan. |
| AC_MSG_RESULT($default_sysnames) |
| |
| |
| ### Locate tools. |
| |
| AC_PROG_INSTALL |
| if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then |
| # The makefiles need to use a different form to find it in $srcdir. |
| INSTALL='\$(..)./scripts/install-sh -c' |
| fi |
| AC_PROG_LN_S |
| |
| LIBC_PROG_BINUTILS |
| |
| if test "$with_clang" = no; then |
| # Accept binutils 2.25 or newer. |
| AC_CHECK_PROG_VER(AS, $AS, --version, |
| [GNU assembler.* \([0-9]*\.[0-9.]*\)], |
| [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*], |
| AS=: critic_missing="$critic_missing as") |
| fi |
| |
| if test "$with_lld" = no; then |
| if test -n "`$LD --version | sed -n 's/^GNU \(gold\).*$/\1/p'`"; then |
| # Accept gold 1.14 or higher |
| AC_CHECK_PROG_VER(LD, $LD, --version, |
| [GNU gold.* \([0-9][0-9]*\.[0-9.]*\)], |
| [1.1[4-9]*|1.[2-9][0-9]*|1.1[0-9][0-9]*|[2-9].*|[1-9][0-9]*], |
| LD=: critic_missing="$critic_missing GNU gold") |
| else |
| AC_CHECK_PROG_VER(LD, $LD, --version, |
| [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)], |
| [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*], |
| LD=: critic_missing="$critic_missing GNU ld") |
| fi |
| fi |
| |
| # These programs are version sensitive. |
| AC_CHECK_TOOL_PREFIX |
| AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version, |
| [GNU Make[^0-9]*\([0-9][0-9.]*\)], |
| [3.79* | 3.[89]* | [4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make") |
| |
| AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version, |
| [GNU gettext.* \([0-9]*\.[0-9.]*\)], |
| [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*], |
| MSGFMT=: aux_missing="$aux_missing msgfmt") |
| AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version, |
| [GNU texinfo.* \([0-9][0-9.]*\)], |
| [4.[7-9]*|4.[1-9][0-9]*|[5-9].*], |
| MAKEINFO=: aux_missing="$aux_missing makeinfo") |
| AC_CHECK_PROG_VER(SED, sed, --version, |
| [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)], |
| [3.0[2-9]*|3.[1-9]*|[4-9]*], |
| SED=: aux_missing="$aux_missing sed") |
| AC_CHECK_PROG_VER(AWK, gawk, --version, |
| [GNU Awk[^0-9]*\([0-9][0-9.]*\)], |
| [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk") |
| AC_CHECK_PROG_VER(BISON, bison, --version, |
| [bison (GNU Bison) \([0-9]*\.[0-9.]*\)], |
| [2.7*|[3-9].*|[1-9][0-9]*], critic_missing="$critic_missing bison") |
| |
| AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [ |
| AC_TRY_COMPILE([], [ |
| #if !defined __GNUC__ || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 9) |
| #if !defined __clang__ |
| #error insufficient compiler |
| #endif |
| #endif], |
| [libc_cv_compiler_ok=yes], |
| [libc_cv_compiler_ok=no])]) |
| AS_IF([test $libc_cv_compiler_ok != yes], |
| [critic_missing="$critic_missing compiler"]) |
| |
| AC_CHECK_TOOL(NM, nm, false) |
| |
| if test "x$maintainer" = "xyes"; then |
| AC_CHECK_PROGS(AUTOCONF, autoconf, no) |
| case "x$AUTOCONF" in |
| xno|x|x:) AUTOCONF=no ;; |
| *) |
| AC_CACHE_CHECK(dnl |
| whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl |
| if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then |
| libc_cv_autoconf_works=yes |
| else |
| libc_cv_autoconf_works=no |
| fi]) |
| test $libc_cv_autoconf_works = yes || AUTOCONF=no |
| ;; |
| esac |
| if test "x$AUTOCONF" = xno; then |
| aux_missing="$aux_missing autoconf" |
| fi |
| else |
| AUTOCONF=no |
| fi |
| |
| # Check for python3 if available, or else python. |
| AC_CHECK_PROGS(PYTHON_PROG, python3 python,no) |
| case "x$PYTHON_PROG" in |
| xno|x|x:) PYTHON_PROG=no ;; |
| *) ;; |
| esac |
| |
| if test "x$PYTHON_PROG" = xno; then |
| aux_missing="$aux_missing python" |
| else |
| PYTHON="$PYTHON_PROG -B" |
| AC_SUBST(PYTHON) |
| fi |
| |
| test -n "$critic_missing" && AC_MSG_ERROR([ |
| *** These critical programs are missing or too old:$critic_missing |
| *** Check the INSTALL file for required versions.]) |
| |
| test -n "$aux_missing" && AC_MSG_WARN([ |
| *** These auxiliary programs are missing or incompatible versions:$aux_missing |
| *** some features or tests will be disabled. |
| *** Check the INSTALL file for required versions.]) |
| |
| # if using special system headers, find out the compiler's sekrit |
| # header directory and add that to the list. NOTE: Only does the right |
| # thing on a system that doesn't need fixincludes. (Not presently a problem.) |
| if test -n "$sysheaders"; then |
| SYSINCLUDES=-nostdinc |
| for d in include include-fixed; do |
| i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" && |
| SYSINCLUDES="$SYSINCLUDES -isystem $i" |
| done |
| SYSINCLUDES="$SYSINCLUDES \ |
| -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`" |
| if test -n "$CXX"; then |
| CXX_SYSINCLUDES= |
| for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \ |
| | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do |
| test "x$cxxheaders" != x && |
| CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders" |
| done |
| fi |
| fi |
| AC_SUBST(SYSINCLUDES) |
| AC_SUBST(CXX_SYSINCLUDES) |
| |
| # Obtain some C++ header file paths. This is used to make a local |
| # copy of those headers in Makerules. |
| changequote(,)dnl |
| if test -n "$CXX"; then |
| # In theory the clang and gcc regexes can be merged, but the |
| # result is incomprehensible. |
| if test "$with_clang" != no; then |
| find_cxx_header () { |
| echo "#include <$1>" | $CXX -M -MP -x c++ - 2>/dev/null \ |
| | sed -n "\,^[o.-]*[ :] /.*/$1 [\]$,{s,^[o.-]*[ :] /,/,;s/ [\]$//;p}" |
| } |
| else |
| find_cxx_header () { |
| echo "#include <$1>" | $CXX -M -MP -x c++ - 2>/dev/null \ |
| | sed -n "\,$1:,{s/:\$//;p}" |
| } |
| fi |
| CXX_CSTDLIB_HEADER="$(find_cxx_header cstdlib)" |
| CXX_CMATH_HEADER="$(find_cxx_header cmath)" |
| CXX_BITS_STD_ABS_H="$(find_cxx_header bits/std_abs.h)" |
| fi |
| changequote([,])dnl |
| AC_SUBST(CXX_CSTDLIB_HEADER) |
| AC_SUBST(CXX_CMATH_HEADER) |
| AC_SUBST(CXX_BITS_STD_ABS_H) |
| |
| # Test if LD_LIBRARY_PATH contains the notation for the current directory |
| # since this would lead to problems installing/building glibc. |
| # LD_LIBRARY_PATH contains the current directory if one of the following |
| # is true: |
| # - one of the terminals (":" and ";") is the first or last sign |
| # - two terminals occur directly after each other |
| # - the path contains an element with a dot in it |
| AC_MSG_CHECKING(LD_LIBRARY_PATH variable) |
| changequote(,)dnl |
| case ${LD_LIBRARY_PATH} in |
| [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* ) |
| ld_library_path_setting="contains current directory" |
| ;; |
| *) |
| ld_library_path_setting="ok" |
| ;; |
| esac |
| changequote([,])dnl |
| AC_MSG_RESULT($ld_library_path_setting) |
| if test "$ld_library_path_setting" != "ok"; then |
| AC_MSG_ERROR([ |
| *** LD_LIBRARY_PATH shouldn't contain the current directory when |
| *** building glibc. Please change the environment variable |
| *** and run configure again.]) |
| fi |
| |
| AC_PATH_PROG(BASH_SHELL, bash, no) |
| |
| AC_PATH_PROG(PERL, perl, no) |
| if test "$PERL" != no && |
| (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then |
| PERL=no |
| fi |
| AC_PATH_PROG(INSTALL_INFO, install-info, no, |
| $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin) |
| |
| AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl |
| cat > conftest.s <<EOF |
| .text |
| foo: |
| .set glibc_conftest_frobozz,foo |
| .globl glibc_conftest_frobozz |
| EOF |
| # The alpha-dec-osf1 assembler gives only a warning for `.set' |
| # (but it doesn't work), so we must do a linking check to be sure. |
| cat > conftest1.c <<\EOF |
| extern int glibc_conftest_frobozz; |
| void _start() { glibc_conftest_frobozz = 1; } |
| EOF |
| if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \ |
| -nostartfiles -nostdlib $no_ssp \ |
| -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then |
| libc_cv_asm_set_directive=yes |
| else |
| libc_cv_asm_set_directive=no |
| fi |
| rm -f conftest*]) |
| if test $libc_cv_asm_set_directive = yes; then |
| AC_DEFINE(HAVE_ASM_SET_DIRECTIVE) |
| fi |
| |
| AC_CACHE_CHECK(linker support for protected data symbol, |
| libc_cv_protected_data, |
| [cat > conftest.c <<EOF |
| int bar __attribute__ ((visibility ("protected"))) = 1; |
| EOF |
| libc_cv_protected_data=no |
| if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -o conftest.so); then |
| cat > conftest.c <<EOF |
| extern int bar; |
| int main (void) { return bar; } |
| EOF |
| if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp conftest.c -o conftest conftest.so); then |
| libc_cv_protected_data=yes |
| fi |
| fi |
| rm -f conftest.* |
| ]) |
| AC_SUBST(libc_cv_protected_data) |
| |
| AC_CACHE_CHECK(linker support for INSERT in linker script, |
| libc_cv_insert, |
| [cat > conftest.c <<EOF |
| const int __attribute__ ((section(".bar"))) bar = 0x12345678; |
| int test (void) { return bar; } |
| EOF |
| cat > conftest.t <<EOF |
| SECTIONS |
| { |
| .bar : { *(.bar) } |
| } |
| INSERT AFTER .rela.dyn; |
| EOF |
| libc_cv_insert=no |
| if AC_TRY_COMMAND([${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -Wl,-T,conftest.t -o conftest.so]); then |
| libc_cv_insert=yes |
| fi |
| rm -f conftest.* |
| ]) |
| AC_SUBST(libc_cv_insert) |
| |
| AC_CACHE_CHECK(for broken __attribute__((alias())), |
| libc_cv_broken_alias_attribute, |
| [cat > conftest.c <<EOF |
| extern int foo (int x) __asm ("xyzzy"); |
| int bar (int x) { return x; } |
| extern __typeof (bar) foo __attribute ((weak, alias ("bar"))); |
| extern int dfoo; |
| extern __typeof (dfoo) dfoo __asm ("abccb"); |
| int dfoo = 1; |
| EOF |
| libc_cv_broken_alias_attribute=yes |
| if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then |
| if grep 'xyzzy' conftest.s >/dev/null && |
| grep 'abccb' conftest.s >/dev/null; then |
| libc_cv_broken_alias_attribute=no |
| fi |
| fi |
| rm -f conftest.c conftest.s |
| ]) |
| if test $libc_cv_broken_alias_attribute = yes; then |
| AC_MSG_ERROR(working alias attribute support required) |
| fi |
| |
| AC_CACHE_CHECK(whether to put _rtld_local into .sdata section, |
| libc_cv_have_sdata_section, |
| [echo "int i;" > conftest.c |
| libc_cv_have_sdata_section=no |
| if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \ |
| | grep '\.sdata' >/dev/null; then |
| libc_cv_have_sdata_section=yes |
| fi |
| rm -f conftest.c conftest.so |
| ]) |
| if test $libc_cv_have_sdata_section = yes; then |
| AC_DEFINE(HAVE_SDATA_SECTION) |
| fi |
| |
| AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer, |
| libc_cv_ctors_header, [dnl |
| libc_cv_ctors_header=yes |
| LIBC_TRY_LINK_STATIC([ |
| __attribute__ ((constructor)) void ctor (void) { asm (""); } |
| __attribute__ ((destructor)) void dtor (void) { asm (""); } |
| ], |
| [dnl |
| AS_IF([$READELF -WS conftest$ac_exeext | $AWK ' |
| { gsub(/\@<:@ */, "@<:@") } |
| $2 == ".ctors" || $2 == ".dtors" { |
| size = strtonum("0x" $6) |
| align = strtonum("0x" $NF) |
| seen@<:@$2@:>@ = 1 |
| stub@<:@$2@:>@ = size == align * 2 |
| } |
| END { |
| ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@ |
| dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@ |
| exit ((ctors_ok && dtors_ok) ? 0 : 1) |
| } |
| '], [libc_cv_ctors_header=no]) |
| ], [dnl |
| AC_MSG_ERROR([missing __attribute__ ((constructor)) support??]) |
| ]) |
| ]) |
| if test $libc_cv_ctors_header = no; then |
| AC_DEFINE(NO_CTORS_DTORS_SECTIONS) |
| fi |
| |
| AC_CACHE_CHECK(for libunwind-support in compiler, |
| libc_cv_cc_with_libunwind, [ |
| cat > conftest.c <<EOF |
| int main (void) { return 0; } |
| EOF |
| if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \ |
| conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then |
| libc_cv_cc_with_libunwind=yes |
| else |
| libc_cv_cc_with_libunwind=no |
| fi |
| rm -f conftest*]) |
| AC_SUBST(libc_cv_cc_with_libunwind) |
| if test $libc_cv_cc_with_libunwind = yes; then |
| AC_DEFINE(HAVE_CC_WITH_LIBUNWIND) |
| fi |
| |
| ASFLAGS_config= |
| AC_CACHE_CHECK(whether --noexecstack is desirable for .S files, |
| libc_cv_as_noexecstack, [dnl |
| cat > conftest.c <<EOF |
| void foo (void) { } |
| EOF |
| if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS |
| -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \ |
| && grep .note.GNU-stack conftest.s >/dev/null \ |
| && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack |
| -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD]) |
| then |
| libc_cv_as_noexecstack=yes |
| else |
| libc_cv_as_noexecstack=no |
| fi |
| rm -f conftest*]) |
| if test $libc_cv_as_noexecstack = yes; then |
| ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack" |
| fi |
| AC_SUBST(ASFLAGS_config) |
| |
| AC_CACHE_CHECK(for -z combreloc, |
| libc_cv_z_combreloc, [dnl |
| cat > conftest.c <<EOF |
| extern int bar (int); |
| extern int mumble; |
| int foo (void) { return bar (mumble); } |
| EOF |
| if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS |
| -fPIC -shared $no_ssp -o conftest.so conftest.c |
| -nostdlib -nostartfiles |
| -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD]) |
| then |
| dnl The following test is a bit weak. We must use a tool which can test |
| dnl cross-platform since the gcc used can be a cross compiler. Without |
| dnl introducing new options this is not easily doable. Instead use a tool |
| dnl which always is cross-platform: readelf. To detect whether -z combreloc |
| dnl look for a section named .rel.dyn or .rela.dyn. |
| if $READELF -S conftest.so | grep -E '.rela?.dyn' > /dev/null; then |
| libc_cv_z_combreloc=yes |
| else |
| libc_cv_z_combreloc=no |
| fi |
| else |
| libc_cv_z_combreloc=no |
| fi |
| rm -f conftest*]) |
| if test "$libc_cv_z_combreloc" = yes; then |
| AC_DEFINE(HAVE_Z_COMBRELOC) |
| fi |
| AC_SUBST(libc_cv_z_combreloc) |
| |
| LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack], |
| [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no]) |
| AC_SUBST(libc_cv_z_execstack) |
| |
| if test "$with_lld" = no; then |
| LIBC_LINKER_FEATURE([--no-dynamic-linker], |
| [-Wl,--no-dynamic-linker], |
| [libc_cv_no_dynamic_linker=yes], |
| [libc_cv_no_dynamic_linker=no]) |
| else |
| libc_cv_no_dynamic_linker=yes |
| fi |
| LIBC_CONFIG_VAR([have-no-dynamic-linker], [$libc_cv_no_dynamic_linker]) |
| |
| AC_CACHE_CHECK(for -static-pie, libc_cv_static_pie, [dnl |
| LIBC_TRY_CC_OPTION([-static-pie], |
| [libc_cv_static_pie=yes], |
| [libc_cv_static_pie=no]) |
| ]) |
| LIBC_CONFIG_VAR([have-static-pie], [$libc_cv_static_pie]) |
| |
| AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl |
| LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no]) |
| ]) |
| |
| AC_SUBST(libc_cv_fpie) |
| |
| AC_CACHE_CHECK(for --hash-style option, |
| libc_cv_hashstyle, [dnl |
| cat > conftest.c <<EOF |
| int _start (void) { return 42; } |
| EOF |
| if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp |
| -fPIC -shared -o conftest.so conftest.c |
| -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD]) |
| then |
| libc_cv_hashstyle=yes |
| else |
| libc_cv_hashstyle=no |
| fi |
| rm -f conftest*]) |
| AC_SUBST(libc_cv_hashstyle) |
| |
| # The linker's default -shared behavior is good enough if it |
| # does these things that our custom linker scripts ensure that |
| # all allocated NOTE sections come first. |
| if test "$use_default_link" = default; then |
| AC_CACHE_CHECK([for sufficient default -shared layout], |
| libc_cv_use_default_link, [dnl |
| libc_cv_use_default_link=no |
| cat > conftest.s <<\EOF |
| .section .note.a,"a",%note |
| .balign 4 |
| .long 4,4,9 |
| .string "GNU" |
| .string "foo" |
| .section .note.b,"a",%note |
| .balign 4 |
| .long 4,4,9 |
| .string "GNU" |
| .string "bar" |
| EOF |
| if AC_TRY_COMMAND([dnl |
| ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) && |
| ac_try=`$READELF -S conftest.so | sed -n \ |
| ['${x;p;} |
| s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/ |
| t a |
| b |
| : a |
| H']` |
| then |
| libc_seen_a=no libc_seen_b=no |
| set -- $ac_try |
| while test $# -ge 2 -a "$1" = NOTE; do |
| case "$2" in |
| .note.a) libc_seen_a=yes ;; |
| .note.b) libc_seen_b=yes ;; |
| esac |
| shift 2 |
| done |
| case "$libc_seen_a$libc_seen_b" in |
| yesyes) |
| libc_cv_use_default_link=yes |
| ;; |
| *) |
| echo >&AS_MESSAGE_LOG_FD "\ |
| $libc_seen_a$libc_seen_b from: |
| $ac_try" |
| ;; |
| esac |
| fi |
| rm -f conftest*]) |
| use_default_link=$libc_cv_use_default_link |
| fi |
| |
| AC_CACHE_CHECK(for GLOB_DAT reloc, |
| libc_cv_has_glob_dat, [dnl |
| cat > conftest.c <<EOF |
| extern int mumble; |
| int foo (void) { return mumble; } |
| EOF |
| if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS |
| -fPIC -shared -o conftest.so conftest.c |
| -nostdlib -nostartfiles $no_ssp |
| 1>&AS_MESSAGE_LOG_FD]) |
| then |
| dnl look for GLOB_DAT relocation. |
| if $READELF -rW conftest.so | grep '_GLOB_DAT' > /dev/null; then |
| libc_cv_has_glob_dat=yes |
| else |
| libc_cv_has_glob_dat=no |
| fi |
| else |
| libc_cv_has_glob_dat=no |
| fi |
| rm -f conftest*]) |
| AC_SUBST(libc_cv_has_glob_dat) |
| |
| AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl |
| if libc_cv_output_format=` |
| ${CC-cc} -nostartfiles -nostdlib $no_ssp -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD` |
| then |
| : |
| else |
| libc_cv_output_format= |
| fi |
| test -n "$libc_cv_output_format" || libc_cv_output_format=unknown]) |
| AC_SUBST(libc_cv_output_format) |
| |
| AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl |
| cat > conftest.c <<EOF |
| int foo; |
| EOF |
| if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors |
| conftest.c 1>&AS_MESSAGE_LOG_FD]) |
| then |
| libc_cv_fno_toplevel_reorder=yes |
| else |
| libc_cv_fno_toplevel_reorder=no |
| fi |
| rm -f conftest*]) |
| if test $libc_cv_fno_toplevel_reorder = yes; then |
| fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors" |
| else |
| fno_unit_at_a_time=-fno-unit-at-a-time |
| fi |
| AC_SUBST(fno_unit_at_a_time) |
| |
| AC_CACHE_CHECK([for -mtls-dialect=gnu2], libc_cv_mtls_dialect_gnu2, |
| [dnl |
| cat > conftest.c <<EOF |
| __thread int i; |
| void foo (void) |
| { |
| i = 10; |
| } |
| EOF |
| if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fPIC -mtls-dialect=gnu2 |
| conftest.c 1>&AS_MESSAGE_LOG_FD]) |
| then |
| libc_cv_mtls_dialect_gnu2=yes |
| else |
| libc_cv_mtls_dialect_gnu2=no |
| fi |
| rm -f conftest*]) |
| AC_SUBST(libc_cv_mtls_dialect_gnu2) |
| LIBC_CONFIG_VAR([have-mtls-dialect-gnu2], [$libc_cv_mtls_dialect_gnu2]) |
| |
| AC_CACHE_CHECK(whether cc puts quotes around section names, |
| libc_cv_have_section_quotes, |
| [cat > conftest.c <<EOF |
| static const int foo |
| __attribute__ ((section ("bar"))) = 1; |
| EOF |
| if ${CC-cc} -S conftest.c -o conftest.s; then |
| if grep '\.section.*"bar"' conftest.s >/dev/null; then |
| libc_cv_have_section_quotes=yes |
| else |
| libc_cv_have_section_quotes=no |
| fi |
| else |
| libc_cv_have_section_quotes=unknown |
| fi |
| rm -f conftest.{c,s} |
| ]) |
| if test $libc_cv_have_section_quotes = yes; then |
| AC_DEFINE(HAVE_SECTION_QUOTES) |
| fi |
| |
| AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl |
| cat > conftest.c <<\EOF |
| void zero (void *x) |
| { |
| __builtin_memset (x, 0, 1000); |
| } |
| EOF |
| dnl |
| if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "memset" > /dev/null]); |
| then |
| libc_cv_gcc_builtin_memset=no |
| else |
| libc_cv_gcc_builtin_memset=yes |
| fi |
| rm -f conftest* ]) |
| if test "$libc_cv_gcc_builtin_memset" = yes ; then |
| AC_DEFINE(HAVE_BUILTIN_MEMSET) |
| fi |
| |
| AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl |
| cat > conftest.c <<\EOF |
| extern char *strstr (const char *, const char *) __asm ("my_strstr"); |
| char *foo (const char *a, const char *b) |
| { |
| return __builtin_strstr (a, b); |
| } |
| EOF |
| dnl |
| if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "strstr" > /dev/null]); |
| then |
| libc_cv_gcc_builtin_redirection=yes |
| else |
| libc_cv_gcc_builtin_redirection=no |
| fi |
| rm -f conftest* ]) |
| if test "$libc_cv_gcc_builtin_redirection" = no; then |
| AC_MSG_ERROR([support for the symbol redirection needed]) |
| fi |
| |
| dnl Determine how to disable generation of FMA instructions. |
| AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions], |
| libc_cv_cc_nofma, [dnl |
| libc_cv_cc_nofma= |
| for opt in -ffp-contract=off -mno-fused-madd; do |
| LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break]) |
| done]) |
| AC_SUBST(libc_cv_cc_nofma) |
| |
| if test -n "$submachine"; then |
| AC_CACHE_CHECK([for compiler option for CPU variant], |
| libc_cv_cc_submachine, [dnl |
| libc_cv_cc_submachine=no |
| for opt in "-march=$submachine" "-mcpu=$submachine"; do |
| LIBC_TRY_CC_OPTION([$opt], [ |
| libc_cv_cc_submachine="$opt" |
| break], []) |
| done]) |
| if test "x$libc_cv_cc_submachine" = xno; then |
| AC_MSG_ERROR([${CC-cc} does not support $submachine]) |
| fi |
| fi |
| AC_SUBST(libc_cv_cc_submachine) |
| |
| AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \ |
| __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl |
| cat > conftest.c <<EOF |
| void |
| __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns"))) |
| foo (void) {} |
| EOF |
| libc_cv_cc_loop_to_function=no |
| if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -Werror -c conftest.c]) |
| then |
| libc_cv_cc_loop_to_function=yes |
| fi |
| rm -f conftest*]) |
| if test $libc_cv_cc_loop_to_function = yes; then |
| AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL) |
| fi |
| AC_SUBST(libc_cv_cc_loop_to_function) |
| |
| dnl Check whether we have the gd library available. |
| AC_MSG_CHECKING(for libgd) |
| if test "$with_gd" != "no"; then |
| old_CFLAGS="$CFLAGS" |
| CFLAGS="$CFLAGS $libgd_include" |
| old_LDFLAGS="$LDFLAGS" |
| LDFLAGS="$LDFLAGS $libgd_ldflags" |
| old_LIBS="$LIBS" |
| LIBS="$LIBS -lgd -lpng -lz -lm" |
| AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no) |
| CFLAGS="$old_CFLAGS" |
| LDFLAGS="$old_LDFLAGS" |
| LIBS="$old_LIBS" |
| else |
| LIBGD=no |
| fi |
| AC_MSG_RESULT($LIBGD) |
| AC_SUBST(LIBGD) |
| |
| # SELinux detection |
| if test x$with_selinux = xno ; then |
| have_selinux=no; |
| else |
| # See if we have the SELinux library |
| AC_CHECK_LIB(selinux, is_selinux_enabled, |
| have_selinux=yes, have_selinux=no) |
| if test x$with_selinux = xyes ; then |
| if test x$have_selinux = xno ; then |
| AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found]) |
| fi |
| fi |
| fi |
| # Check if we're building with SELinux support. |
| if test "x$have_selinux" = xyes; then |
| AC_DEFINE(HAVE_SELINUX, 1, [SELinux support]) |
| |
| # See if we have the libaudit library |
| AC_CHECK_LIB(audit, audit_log_user_avc_message, |
| have_libaudit=yes, have_libaudit=no) |
| if test "x$have_libaudit" = xyes; then |
| AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support]) |
| fi |
| AC_SUBST(have_libaudit) |
| |
| # See if we have the libcap library |
| AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no) |
| if test "x$have_libcap" = xyes; then |
| AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support]) |
| fi |
| AC_SUBST(have_libcap) |
| fi |
| AC_SUBST(have_selinux) |
| |
| CPPUNDEFS= |
| dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE. |
| dnl Since we are building the implementations of the fortified functions here, |
| dnl having the macro defined interacts very badly. |
| AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source, |
| [AC_TRY_COMPILE([], [ |
| #ifdef _FORTIFY_SOURCE |
| # error bogon |
| #endif], |
| [libc_cv_predef_fortify_source=no], |
| [libc_cv_predef_fortify_source=yes])]) |
| if test $libc_cv_predef_fortify_source = yes; then |
| CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE" |
| fi |
| AC_SUBST(CPPUNDEFS) |
| |
| # Some linkers on some architectures support __ehdr_start but with |
| # bugs. Make sure usage of it does not create relocations in the |
| # output (as the linker should resolve them all for us). |
| AC_CACHE_CHECK([whether the linker provides working __ehdr_start], |
| libc_cv_ehdr_start, [ |
| old_CFLAGS="$CFLAGS" |
| old_LDFLAGS="$LDFLAGS" |
| old_LIBS="$LIBS" |
| CFLAGS="$CFLAGS -fPIC" |
| LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared $no_ssp" |
| LIBS= |
| AC_LINK_IFELSE([AC_LANG_SOURCE([ |
| typedef struct { |
| char foo; |
| long val; |
| } Ehdr; |
| extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden"))); |
| long ehdr (void) { return __ehdr_start.val; } |
| ])], |
| [if $READELF -r conftest | grep -F __ehdr_start >/dev/null; then |
| libc_cv_ehdr_start=broken |
| else |
| libc_cv_ehdr_start=yes |
| fi], [libc_cv_ehdr_start=no]) |
| CFLAGS="$old_CFLAGS" |
| LDFLAGS="$old_LDFLAGS" |
| LIBS="$old_LIBS" |
| ]) |
| if test "$libc_cv_ehdr_start" = yes; then |
| AC_DEFINE([HAVE_EHDR_START]) |
| elif test "$libc_cv_ehdr_start" = broken; then |
| AC_MSG_WARN([linker is broken -- you should upgrade]) |
| fi |
| |
| AC_CACHE_CHECK(for __builtin_trap with no external dependencies, |
| libc_cv_builtin_trap, [dnl |
| libc_cv_builtin_trap=no |
| AC_TRY_COMPILE([], [__builtin_trap ()], [ |
| libc_undefs=`$NM -u conftest.o | |
| LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \ |
| 2>&AS_MESSAGE_LOG_FD` || { |
| AC_MSG_ERROR([confusing output from $NM -u]) |
| } |
| echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'" |
| if test -z "$libc_undefs"; then |
| libc_cv_builtin_trap=yes |
| fi])]) |
| if test $libc_cv_builtin_trap = yes; then |
| AC_DEFINE([HAVE_BUILTIN_TRAP]) |
| fi |
| |
| dnl C++ feature tests. |
| AC_LANG_PUSH([C++]) |
| |
| AC_CACHE_CHECK([whether the C++ compiler supports thread_local], |
| libc_cv_cxx_thread_local, [ |
| old_CXXFLAGS="$CXXFLAGS" |
| CXXFLAGS="$CXXFLAGS -std=gnu++11" |
| AC_COMPILE_IFELSE([AC_LANG_SOURCE([ |
| #include <thread> |
| |
| // Compiler support. |
| struct S |
| { |
| S (); |
| ~S (); |
| }; |
| thread_local S s; |
| S * get () { return &s; } |
| |
| // libstdc++ support. |
| #ifndef _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL |
| #error __cxa_thread_atexit_impl not supported |
| #endif |
| ])], |
| [libc_cv_cxx_thread_local=yes], |
| [libc_cv_cxx_thread_local=no]) |
| CXXFLAGS="$old_CXXFLAGS" |
| ]) |
| AC_SUBST(libc_cv_cxx_thread_local) |
| |
| AC_LANG_POP([C++]) |
| dnl End of C++ feature tests. |
| |
| ### End of automated tests. |
| ### Now run sysdeps configure fragments. |
| |
| # They also can set these variables. |
| use_ldconfig=no |
| ldd_rewrite_script=no |
| libc_cv_sysconfdir=$sysconfdir |
| libc_cv_localstatedir=$localstatedir |
| libc_cv_gcc_unwind_find_fde=no |
| libc_cv_idn=no |
| |
| # Iterate over all the sysdep directories we will use, running their |
| # configure fragments. |
| for dir in $sysnames; do |
| case $dir in |
| /*) dest=$dir ;; |
| *) dest=$srcdir/$dir ;; |
| esac |
| if test -r $dest/configure; then |
| AC_MSG_RESULT(running configure fragment for $dir) |
| . $dest/configure |
| fi |
| done |
| |
| if test x"$build_mathvec" = xnotset; then |
| build_mathvec=no |
| fi |
| LIBC_CONFIG_VAR([build-mathvec], [$build_mathvec]) |
| |
| AC_SUBST(libc_extra_cflags) |
| AC_SUBST(libc_extra_cppflags) |
| |
| if test x$libc_cv_gcc_unwind_find_fde = xyes; then |
| AC_DEFINE(EXPORT_UNWIND_FIND_FDE) |
| fi |
| AC_SUBST(libc_cv_gcc_unwind_find_fde) |
| |
| # A sysdeps configure fragment can reset this if IFUNC is not actually |
| # usable even though the assembler knows how to generate the symbol type. |
| if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then |
| AC_DEFINE(HAVE_IFUNC) |
| fi |
| |
| if test x"$libc_cv_gcc_indirect_function" = xyes; then |
| AC_DEFINE(HAVE_GCC_IFUNC) |
| fi |
| |
| # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps |
| # configure fragment can override the value to prevent this AC_DEFINE. |
| AC_SUBST(use_nscd) |
| if test "x$use_nscd" != xno; then |
| AC_DEFINE([USE_NSCD]) |
| fi |
| if test "x$build_nscd" = xdefault; then |
| build_nscd=$use_nscd |
| fi |
| |
| AC_SUBST(libc_cv_slibdir) |
| AC_SUBST(libc_cv_rtlddir) |
| AC_SUBST(libc_cv_complocaledir) |
| AC_SUBST(libc_cv_sysconfdir) |
| AC_SUBST(libc_cv_localstatedir) |
| AC_SUBST(libc_cv_rootsbindir) |
| |
| if test x$use_ldconfig = xyes; then |
| AC_DEFINE(USE_LDCONFIG) |
| fi |
| AC_SUBST(use_ldconfig) |
| AC_SUBST(ldd_rewrite_script) |
| |
| AC_SUBST(static) |
| AC_SUBST(shared) |
| |
| AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default, |
| [libc_cv_pic_default=yes |
| cat > conftest.c <<EOF |
| #if defined __PIC__ || defined __pic__ || defined PIC || defined pic |
| # error PIC is default. |
| #endif |
| EOF |
| if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then |
| libc_cv_pic_default=no |
| fi |
| rm -f conftest.*]) |
| AC_SUBST(libc_cv_pic_default) |
| |
| AC_CACHE_CHECK([whether -fPIE is default], libc_cv_cc_pie_default, |
| [libc_cv_cc_pie_default=yes |
| cat > conftest.c <<EOF |
| #if defined __PIE__ || defined __pie__ || defined PIE || defined pie |
| # error PIE is default. |
| #endif |
| EOF |
| if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then |
| libc_cv_cc_pie_default=no |
| fi |
| rm -f conftest.*]) |
| libc_cv_pie_default=$libc_cv_cc_pie_default |
| AC_SUBST(libc_cv_cc_pie_default) |
| AC_SUBST(libc_cv_pie_default) |
| |
| # Set the `multidir' variable by grabbing the variable from the compiler. |
| # We do it once and save the result in a generated makefile. |
| libc_cv_multidir=. |
| if test "$with_clang" = no; then |
| libc_cv_multidir=`${CC-cc} $CFLAGS $CPPFLAGS -print-multi-directory` |
| fi |
| AC_SUBST(libc_cv_multidir) |
| |
| if test "$static_pie" = yes; then |
| # The linker must support --no-dynamic-linker. |
| if test "$libc_cv_no_dynamic_linker" != yes; then |
| AC_MSG_ERROR([linker support for --no-dynamic-linker needed]) |
| fi |
| # Default to PIE. |
| libc_cv_pie_default=yes |
| AC_DEFINE(ENABLE_STATIC_PIE) |
| fi |
| LIBC_CONFIG_VAR([enable-static-pie], [$static_pie]) |
| |
| AC_SUBST(profile) |
| AC_SUBST(static_nss) |
| |
| AC_SUBST(DEFINES) |
| |
| dnl See sysdeps/mach/configure.ac for this variable. |
| AC_SUBST(mach_interface_list) |
| |
| VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h` |
| RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h` |
| AC_SUBST(VERSION) |
| AC_SUBST(RELEASE) |
| |
| AC_CONFIG_FILES([config.make Makefile]) |
| AC_CONFIG_COMMANDS([default],[[ |
| case $CONFIG_FILES in *config.make*) |
| echo "$config_vars" >> config.make;; |
| esac |
| test -d bits || mkdir bits]],[[config_vars='$config_vars']]) |
| AC_OUTPUT |
