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# Copyright (C) 1991-2014 Free Software Foundation, Inc.
# This file is part of the GNU C Library.
# The GNU C Library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
# The GNU C Library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# Lesser General Public License for more details.
# You should have received a copy of the GNU Lesser General Public
# License along with the GNU C Library; if not, see
# <>.
# Makefile configuration options for the GNU C library.
ifneq (,)
This makefile requires GNU Make.
all: # Make this the default goal
ifneq "$(origin +included-Makeconfig)" "file"
+included-Makeconfig := yes
ifdef subdir
.. := ../
# $(common-objdir) is the place to put objects and
# such that are not specific to a single subdir.
ifdef objdir
objpfx := $(patsubst %//,%/,$(objdir)/$(subdir)/)
common-objpfx = $(objdir)/
common-objdir = $(objdir)
objdir must be defined by the build-directory Makefile.
# Root of the sysdeps tree.
sysdep_dir := $(..)sysdeps
export sysdep_dir := $(sysdep_dir)
# Get the values defined by options to `configure'.
include $(common-objpfx)config.make
# What flags to give to sources which call user provided callbacks
uses-callbacks = $(exceptions)
# What flags to give to tests which test stack alignment
stack-align-test-flags =
# Complete path to sysdep dirs.
# `configure' writes a definition of `config-sysdirs' in `config.make'.
sysdirs := $(foreach D,$(config-sysdirs),$(firstword $(filter /%,$D) $(..)$D))
# Add-ons that contribute sysdeps trees get added to the include list
# after sysdeps/generic. This makes #include <sysdeps/...> work right
# to find specific add-on files without assuming the add-on directory name.
# It also means that headers can go into an add-on's base directory
# instead of the add-on needing a sysdeps/generic of its own.
sysdeps-srcdirs := $(foreach add-on,$(sysdeps-add-ons),\
$(firstword $(filter /%,$(add-on)) \
+sysdep_dirs = $(sysdirs) $(sysdeps-srcdirs)
ifdef objdir
+sysdep_dirs := $(objdir) $(+sysdep_dirs)
# Run config.status to update config.make and config.h. We don't show the
# dependence of config.h to Make, because it is only touched when it
# changes and so config.status would be run every time; the dependence of
# config.make should suffice to force regeneration and re-exec, and the new
# image will notice if config.h changed.
$(common-objpfx)config.make: $(common-objpfx)config.status \
$(..) $(..)
cd $(<D); $(SHELL) $(<F)
# Find all the add-on and sysdeps configure fragments, to make sure we
# re-run configure when any of them changes.
$(common-objpfx)config.status: $(..)version.h $(..)configure \
$(foreach dir,$(sysdirs),\
$(wildcard $(dir)/Implies) \
$(firstword $(wildcard \
$(addprefix $(dir)/,configure \
$(wildcard $(..)sysdeps/*/preconfigure $(..)sysdeps/*/ \
$(foreach add-on,$(add-ons),\
$(firstword $(wildcard \
$(addprefix $(firstword $(filter /%,$(add-on)) $(..)$(add-on))/,\
configure \
$(wildcard $(addprefix $(firstword $(filter /%,$(add-on)) $(..)$(add-on))/,\
sysdeps/*/preconfigure sysdeps/*/
@cd $(@D); if test -f $(@F); then exec $(SHELL) $(@F) --recheck; else \
echo The GNU C library has not been configured. >&2; \
echo Run \`configure\' to configure it before building. >&2; \
echo Try \`configure --help\' for more details. >&2; \
exit 1; fi
# We don't want CPPFLAGS to be exported to the command running configure.
unexport CPPFLAGS
# Get the user's configuration parameters.
ifneq ($(wildcard $(..)configparms),)
include $(..)configparms
ifneq ($(objpfx),)
ifneq ($(wildcard $(common-objpfx)configparms),)
include $(common-objpfx)configparms
#### These are the configuration variables. You can define values for
#### the variables below in the file `configparms'.
#### Do NOT edit this file.
# Common prefix for machine-independent installation directories.
ifeq ($(origin prefix),undefined) # ifndef would override explicit empty value.
prefix = /usr/local
# Decide whether we shall build the programs or not. We always do this
# unless the user tells us (in configparms) or we are building for a
# standalone target.
ifndef build-programs
ifneq ($(config-os),none)
# Common prefix for machine-dependent installation directories.
ifeq ($(origin exec_prefix),undefined)
exec_prefix = $(prefix)
# Where to install the library and object files.
ifndef libdir
libdir = $(exec_prefix)/lib
inst_libdir = $(install_root)$(libdir)
# Where to install the shared library.
ifndef slibdir
slibdir = $(exec_prefix)/lib
inst_slibdir = $(install_root)$(slibdir)
# Where to install the dynamic linker.
ifndef rtlddir
rtlddir = $(slibdir)
inst_rtlddir = $(install_root)$(rtlddir)
# Prefix to put on files installed in $(libdir). For libraries `libNAME.a',
# the prefix is spliced between `lib' and the name, so the linker switch
# `-l$(libprefix)NAME' finds the library; for other files the prefix is
# just prepended to the whole file name.
ifeq ($(origin libprefix),undefined)
libprefix =
# Where to install the header files.
ifndef includedir
includedir = $(prefix)/include
inst_includedir = $(install_root)$(includedir)
# Where to install machine-independent data files.
# These are the timezone database, and the locale database.
ifndef datadir
datadir = $(prefix)/share
inst_datadir = $(install_root)$(datadir)
# Where to install the timezone data files (which are machine-independent).
ifndef zonedir
zonedir = $(datadir)/zoneinfo
inst_zonedir = $(install_root)$(zonedir)
# Where to install the locale files.
ifndef localedir
localedir = $(libdir)/locale
inst_localedir = $(install_root)$(localedir)
# Where to install the message catalog data files (which are
# machine-independent).
ifndef msgcatdir
msgcatdir = $(datadir)/locale
inst_msgcatdir = $(install_root)$(msgcatdir)
# Where to install the locale charmap source files.
ifndef i18ndir
i18ndir = $(datadir)/i18n
inst_i18ndir = $(install_root)$(i18ndir)
# Where to install the shared object for charset transformation.
ifndef gconvdir
gconvdir = $(libdir)/gconv
inst_gconvdir = $(install_root)$(gconvdir)
# Where to install programs.
ifndef bindir
bindir = $(exec_prefix)/bin
inst_bindir = $(install_root)$(bindir)
# Where to install internal programs.
ifndef libexecdir
libexecdir = $(exec_prefix)/libexec
inst_libexecdir = $(install_root)$(libexecdir)
# Where to install administrative programs.
ifndef rootsbindir
rootsbindir = $(exec_prefix)/sbin
inst_rootsbindir = $(install_root)$(rootsbindir)
ifndef sbindir
sbindir = $(exec_prefix)/sbin
inst_sbindir = $(install_root)$(sbindir)
# Where to install the Info files.
ifndef infodir
infodir = $(prefix)/info
inst_infodir = $(install_root)$(infodir)
# Where to install audit libraries.
ifndef auditdir
auditdir = $(libdir)/audit
inst_auditdir = $(install_root)$(auditdir)
# Where to install default configuration files. These include the local
# timezone specification and network data base files.
ifndef sysconfdir
sysconfdir = $(prefix)/etc
inst_sysconfdir = $(install_root)$(sysconfdir)
# Directory for the database files and Makefile for nss_db.
ifndef vardbdir
vardbdir = $(localstatedir)/db
inst_vardbdir = $(install_root)$(vardbdir)
# Where to install the "localtime" timezone file; this is the file whose
# contents $(localtime) specifies. If this is a relative pathname, it is
# relative to $(zonedir). It is a good idea to put this somewhere
# other than there, so the zoneinfo directory contains only universal data,
# localizing the configuration data elsewhere.
ifndef localtime-file
localtime-file = $(sysconfdir)/localtime
# What to use for leap second specifications in compiling the default
# timezone files. Set this to `/dev/null' for no leap second handling as
# 1003.1 requires, or to `leapseconds' for proper leap second handling.
# Both zone flavors are always available as `posix/ZONE' and `right/ZONE'.
# This variable determines the default: if it's `/dev/null',
# ZONE==posix/ZONE; if it's `leapseconds', ZONE==right/ZONE.
ifndef leapseconds
leapseconds = /dev/null
# What timezone's DST rules should be used when a POSIX-style TZ
# environment variable doesn't specify any rules. For 1003.1 compliance
# this timezone must use rules that are as U.S. federal law defines DST.
# Run `make -C time echo-zonenames' to see a list of available zone names.
# This setting can be changed with `zic -p TIMEZONE' at any time.
# If you want POSIX.1 compatibility, use `America/New_York'.
ifndef posixrules
posixrules = America/New_York
# Where to install the "posixrules" timezone file; this is file
# whose contents $(posixrules) specifies. If this is a relative
# pathname, it is relative to $(zonedir).
ifndef posixrules-file
posixrules-file = posixrules
# Directory where your system's native header files live.
# This is used on Unix systems to generate some GNU libc header files.
ifndef sysincludedir
sysincludedir = /usr/include
# Commands to install files.
ifndef INSTALL
INSTALL = install
# The name of the C compiler.
# If you've got GCC, and it works, use it.
ifeq ($(origin CC),default)
CC := gcc
# The name of the C compiler to use for compilations of programs to run on
# the host that is building the library. If you set CC to a
# cross-compiler, you must set this to the normal compiler.
ifndef BUILD_CC
# Default flags to pass the C compiler.
ifndef default_cflags
ifeq ($(release),stable)
default_cflags := -g -O2
default_cflags := -g -O
# Flags to pass the C compiler when assembling preprocessed assembly code
# (`.S' files). On some systems the assembler doesn't understand the `#' line
# directives the preprocessor produces. If you have troubling compiling
# assembly code, try using -P here to suppress these directives.
ifndef asm-CPPFLAGS
as-needed := -Wl,--as-needed
no-as-needed := -Wl,--no-as-needed
# Must be supported by the linker.
no-whole-archive = -Wl,--no-whole-archive
whole-archive = -Wl,--whole-archive
# Installed name of the startup code.
# The ELF convention is that the startfile is called crt1.o
start-installed-name = crt1.o
# On systems that do not need a special startfile for statically linked
# binaries, simply set it to the normal name.
ifndef static-start-installed-name
static-start-installed-name = $(start-installed-name)
ifeq (yesyes,$(build-shared)$(have-z-combreloc))
combreloc-LDFLAGS = -Wl,-z,combreloc += $(combreloc-LDFLAGS)
LDFLAGS-rtld += $(combreloc-LDFLAGS)
relro-LDFLAGS = -Wl,-z,relro += $(relro-LDFLAGS)
LDFLAGS-rtld += $(relro-LDFLAGS)
ifeq (yes,$(have-hash-style))
# For the time being we unconditionally use 'both'. At some time we
# should declare statically linked code as 'out of luck' and compile
# with --hash-style=gnu only.
hashstyle-LDFLAGS = -Wl,--hash-style=both += $(hashstyle-LDFLAGS)
LDFLAGS-rtld += $(hashstyle-LDFLAGS)
# Command for linking PIE programs with the C library.
ifndef +link-pie
+link-pie-before-libc = $(CC) -pie -Wl,-O1 -nostdlib -nostartfiles -o $@ \
$(sysdep-LDFLAGS) $(LDFLAGS) $(LDFLAGS-$(@F)) \
$(combreloc-LDFLAGS) $(relro-LDFLAGS) $(hashstyle-LDFLAGS) \
$(addprefix $(csu-objpfx),S$(start-installed-name)) \
$(+preinit) $(+prectorS) \
$(filter-out $(addprefix $(csu-objpfx),start.o \
$(+preinit) $(link-extra-libs) \
$(common-objpfx)libc% $(+postinit),$^) \
+link-pie-after-libc = $(+postctorS) $(+postinit)
+link-pie = $(+link-pie-before-libc) $(rtld-LDFLAGS) $(link-libc) \
+link-pie-tests = $(+link-pie-before-libc) $(rtld-tests-LDFLAGS) \
$(link-libc-tests) $(+link-pie-after-libc)
# Command for statically linking programs with the C library.
ifndef +link-static
+link-static-before-libc = $(CC) -nostdlib -nostartfiles -static -o $@ \
$(sysdep-LDFLAGS) $(LDFLAGS) $(LDFLAGS-$(@F)) \
$(addprefix $(csu-objpfx),$(static-start-installed-name)) \
$(+preinit) $(+prectorT) \
$(filter-out $(addprefix $(csu-objpfx),start.o \
$(+preinit) $(link-extra-libs-static) \
$(common-objpfx)libc% $(+postinit),$^) \
+link-static-after-libc = $(+postctorT) $(+postinit)
+link-static = $(+link-static-before-libc) $(link-libc-static) \
+link-static-tests = $(+link-static-before-libc) $(link-libc-static-tests) \
# Commands for linking programs with the C library.
ifndef +link
ifeq (yes,$(build-shared))
+link-before-libc = $(CC) -nostdlib -nostartfiles -o $@ \
$(sysdep-LDFLAGS) $(LDFLAGS) $(LDFLAGS-$(@F)) \
$(combreloc-LDFLAGS) $(relro-LDFLAGS) $(hashstyle-LDFLAGS) \
$(addprefix $(csu-objpfx),$(start-installed-name)) \
$(+preinit) $(+prector) \
$(filter-out $(addprefix $(csu-objpfx),start.o \
$(+preinit) $(link-extra-libs) \
$(common-objpfx)libc% $(+postinit),$^) \
+link-after-libc = $(+postctor) $(+postinit)
+link = $(+link-before-libc) $(rtld-LDFLAGS) $(link-libc) \
+link-tests = $(+link-before-libc) $(rtld-tests-LDFLAGS) \
$(link-libc-tests) $(+link-after-libc)
+link = $(+link-static)
+link-tests = $(+link-static-tests)
ifeq (yes,$(build-shared))
ifndef rtld-LDFLAGS
rtld-LDFLAGS = -Wl,-dynamic-linker=$(rtlddir)/$(rtld-installed-name)
ifndef rtld-tests-LDFLAGS
ifeq (yes,$(build-hardcoded-path-in-tests))
rtld-tests-LDFLAGS = -Wl,-dynamic-linker=$(common-objpfx)elf/
rtld-tests-LDFLAGS = $(rtld-LDFLAGS)
ifndef link-libc
ifeq (yes,$(build-shared))
# We need the versioned name of in the deps of $(others) et al
# so that the symlink to is created before anything tries to
# run the linked programs.
link-libc-rpath-link = -Wl,-rpath-link=$(rpath-link)
ifeq (yes,$(build-hardcoded-path-in-tests))
link-libc-tests-rpath-link = -Wl,-rpath=$(rpath-link)
link-libc-tests-rpath-link = $(link-libc-rpath-link)
link-libc-before-gnulib = $(common-objpfx)$( \
$(common-objpfx)$(patsubst %,$(libtype.oS),c) \
$(as-needed) $(common-objpfx)elf/ \
link-libc = $(link-libc-rpath-link) $(link-libc-before-gnulib) $(gnulib)
link-libc-tests = $(link-libc-tests-rpath-link) \
$(link-libc-before-gnulib) $(gnulib-tests)
# This is how to find at build-time things that will be installed there.
rpath-dirs = math elf dlfcn nss nis rt resolv crypt
rpath-link = \
$(common-objdir):$(subst $(empty) ,:,$(patsubst ../$(subdir),.,$(rpath-dirs:%=$(common-objpfx)%)))
link-libc = $(common-objpfx)libc.a $(otherlibs) $(gnulib) $(common-objpfx)libc.a $(gnulib)
link-libc-tests = $(common-objpfx)libc.a $(otherlibs) $(gnulib-tests) $(common-objpfx)libc.a $(gnulib-tests)
elfobjdir := $(patsubst ../$(subdir),.,$(common-objpfx)elf)
# Differences in the linkers on the various platforms.
LDFLAGS-rpath-ORIGIN = -Wl,-rpath,'$$ORIGIN'
LDFLAGS-soname-fname = -Wl,-soname,$(@F)
LDFLAGS-rdynamic = -rdynamic
LDFLAGS-Bsymbolic = -Bsymbolic
# Choose the default search path for the dynamic linker based on
# where we will install libraries.
ifneq ($(libdir),$(slibdir))
default-rpath = $(slibdir):$(libdir)
default-rpath = $(libdir)
ifndef link-extra-libs
link-extra-libs = $(LDLIBS-$(@F))
link-extra-libs-static = $(link-extra-libs)
# The static libraries.
link-libc-static = -Wl,--start-group $(common-objpfx)libc.a $(static-gnulib) -Wl,--end-group
link-libc-static-tests = -Wl,--start-group $(common-objpfx)libc.a $(static-gnulib-tests) -Wl,--end-group
# How to link against libgcc. Some libgcc functions, such as those
# for "long long" arithmetic or software floating point, can always be
# built without use of C library headers and do not have any global
# state so can safely be linked statically into any executable or
# shared library requiring them; these functions are in libgcc.a.
# Other functions, relating to exception handling, may require C
# library headers to build and it may not be safe to have more than
# one copy of them in a process; these functions are only in
# and libgcc_eh.a.
# To avoid circular dependencies when bootstrapping, it is desirable
# to avoid use of libgcc_s and libgcc_eh in building glibc. Where any
# glibc functionality (in particular, thread cancellation) requires
# exception handling, this is implemented through dlopen of libgcc_s
# to avoid unnecessary dependencies on libgcc_s by programs not using
# that functionality; executables built with glibc do not use
# exception handling other than through thread cancellation.
# Undefined references to functions from libgcc_eh or libgcc_s may
# arise for code built with -fexceptions. In the case of statically
# linked programs installed by glibc, unwinding will never actually
# occur at runtime and the use of elf/static-stubs.c to resolve these
# references is safe. In the case of statically linked test programs
# and test programs built with -fexceptions, unwinding may occur in
# some cases and it is preferable to link with libgcc_eh or libgcc_s
# so that the testing is as similar as possible to how programs will
# be built with the installed glibc.
# Some architectures have architecture-specific systems for exception
# handling that may involve undefined references to
# architecture-specific functions. On those architectures,
# gnulib-arch and static-gnulib-arch may be defined in sysdeps
# makefiles to use additional libraries for linking executables and
# shared libraries built by glibc.
ifndef gnulib
ifneq ($(have-cc-with-libunwind),yes)
libunwind =
libunwind = -lunwind
libgcc_eh := -Wl,--as-needed -lgcc_s $(libunwind) -Wl,--no-as-needed
gnulib-arch =
gnulib = -lgcc $(gnulib-arch)
gnulib-tests := -lgcc $(libgcc_eh)
static-gnulib-arch =
# By default, elf/static-stubs.o, instead of -lgcc_eh, is used to
# statically link programs. When --disable-shared is used, we use
# -lgcc_eh since elf/static-stubs.o isn't sufficient.
ifeq (yes,$(build-shared))
static-gnulib = -lgcc $(static-gnulib-arch)
static-gnulib = -lgcc -lgcc_eh $(static-gnulib-arch)
static-gnulib-tests := -lgcc -lgcc_eh $(libunwind) := -lgcc
+preinit = $(addprefix $(csu-objpfx),crti.o)
+postinit = $(addprefix $(csu-objpfx),crtn.o)
+prector = `$(CC) $(sysdep-LDFLAGS) --print-file-name=crtbegin.o`
+postctor = `$(CC) $(sysdep-LDFLAGS) --print-file-name=crtend.o`
# Variants of the two previous definitions for linking PIE programs.
+prectorS = `$(CC) $(sysdep-LDFLAGS) --print-file-name=crtbeginS.o`
+postctorS = `$(CC) $(sysdep-LDFLAGS) --print-file-name=crtendS.o`
# Variants of the two previous definitions for statically linking programs.
+prectorT = `$(CC) $(sysdep-LDFLAGS) --print-file-name=crtbeginT.o`
+postctorT = `$(CC) $(sysdep-LDFLAGS) --print-file-name=crtend.o`
+interp = $(addprefix $(elf-objpfx),interp.os)
csu-objpfx = $(common-objpfx)csu/
elf-objpfx = $(common-objpfx)elf/
# A command that, prepended to the name and arguments of a program,
# and run on the build system, causes that program with those
# arguments to be run on the host for which the library is built.
ifndef test-wrapper
test-wrapper =
# Likewise, but the name of the program is preceded by
# <variable>=<value> assignments for environment variables.
ifndef test-wrapper-env
test-wrapper-env = $(test-wrapper) env
# Whether to run test programs built for the library's host system.
ifndef run-built-tests
ifeq (yes|,$(cross-compiling)|$(test-wrapper))
run-built-tests = no
run-built-tests = yes
# How to run a program we just linked with our library.
# The program binary is assumed to be $(word 2,$^).
built-program-file = $(dir $(word 2,$^))$(notdir $(word 2,$^))
rtld-prefix = $(elf-objpfx)$(rtld-installed-name) \
--library-path \
$(rpath-link)$(patsubst %,:%,$(sysdep-library-path))
ifeq (yes,$(build-shared))
comma = ,
sysdep-library-path = \
$(subst $(empty) ,:,$(strip $(patsubst -Wl$(comma)-rpath-link=%, %,\
$(filter -Wl$(comma)-rpath-link=%,\
# $(run-via-rtld-prefix) is a command that, when prepended to the name
# of a program built with the newly built library, produces a command
# that, executed on the host for which the library is built, runs that
# program. For tests listed in tests-static or xtests-static, it is
# empty.
run-via-rtld-prefix = \
$(if $(strip $(filter $(notdir $(built-program-file)), \
$(tests-static) $(xtests-static))),, $(rtld-prefix))
run-via-rtld-prefix =
# $(run-program-prefix) is a command that, when prepended to the name
# of a program built with the newly built library, produces a command
# that, executed on the build system on which "make" is run, runs that
# program.
run-program-prefix = $(test-wrapper) $(run-via-rtld-prefix)
# $(built-program-cmd) is a command that, executed on the build system
# on which "make" is run, runs the newly built program that is the
# second dependency of the makefile target in which
# $(built-program-cmd) is used.
built-program-cmd = $(test-wrapper) \
$(run-via-rtld-prefix) $(built-program-file)
# $(host-built-program-cmd) is a command that, executed on the host
# for which the library is built, runs the newly built program that is
# the second dependency of the makefile target in which
# $(host-built-program-cmd) is used.
host-built-program-cmd = $(run-via-rtld-prefix) $(built-program-file)
ifndef LD
LD := ld -X
# $(test-via-rtld-prefix) is a command that, when prepended to the name
# of a test program built with the newly built library, produces a command
# that, executed on the host for which the library is built, runs that
# program. For tests listed in tests-static or xtests-static as well
# as when test programs are hardcoded to the newly built libraries, it
# is empty.
# $(test-program-prefix) is a command that, when prepended to the name
# of a test program built with the newly built library, produces a command
# that, executed on the build system on which "make" is run, runs that
# test program.
# $(test-program-cmd) is a command that, executed on the build system
# on which "make" is run, runs the newly built test program that is the
# second dependency of the makefile target in which
# $(test-program-cmd) is used.
# $(host-test-program-cmd) is a command that, executed on the host
# for which the library is built, runs the newly built test program that
# is the second dependency of the makefile target in which
# $(host-test-program-cmd) is used.
ifeq (yes,$(build-hardcoded-path-in-tests))
test-via-rtld-prefix =
test-program-prefix = $(test-wrapper)
test-program-cmd = $(test-wrapper) $(built-program-file)
host-test-program-cmd = $(built-program-file)
test-via-rtld-prefix = $(run-via-rtld-prefix)
test-program-prefix = $(run-program-prefix)
test-program-cmd = $(built-program-cmd)
host-test-program-cmd = $(host-built-program-cmd)
# Extra flags to pass to GCC.
ifeq ($(all-warnings),yes)
+gccwarn := -Wall -Wwrite-strings -Winline -Wcast-qual -Wbad-function-cast -Wmissing-noreturn -Wmissing-prototypes -Wmissing-declarations -Wcomment -Wcomments -Wtrigraphs -Wsign-compare -Wfloat-equal -Wmultichar
+gccwarn := -Wall -Wwrite-strings -Winline
+gccwarn-c = -Wstrict-prototypes
# We do not depend on the address of constants in different files to be
# actually different, so allow the compiler to merge them all.
+merge-constants = -fmerge-all-constants
# We have to assume that glibc functions are called in any rounding
# mode and also change the rounding mode in a few functions. So,
# disable any optimization that assume default rounding mode.
+math-flags = -frounding-math
# This is the program that generates makefile dependencies from C source files.
# The -MP flag tells GCC >= 3.2 (which we now require) to produce dummy
# targets for headers so that removed headers don't break the build.
ifndef +mkdep
+mkdep = $(CC) -M -MP
# The program that makes Emacs-style TAGS files.
ETAGS := etags
# The `xgettext' program for producing .pot files from sources.
XGETTEXT = xgettext
# The `m4' macro processor; this is used by sysdeps/sparc/Makefile (and
# perhaps others) to preprocess assembly code in some cases.
M4 = m4
# To force installation of files even if they are older than the
# installed files. This variable is included in the dependency list
# of all installation targets.
ifeq ($(force-install),yes)
+force = force-install
+force =
#### End of configuration variables.
# This tells some versions of GNU make before 3.63 not to export all variables.
# We want to echo the commands we're running without
# umpteen zillion filenames along with it (we use `...' instead)
# but we don't want this echoing done when the user has said
# he doesn't want to see commands echoed by using -s.
ifneq "$(findstring s,$(MAKEFLAGS))" "" # if -s
+cmdecho := echo >/dev/null
else # not -s
+cmdecho := echo
endif # -s
# These are the flags given to the compiler to tell
# it what sort of optimization and/or debugging output to do.
ifndef +cflags
# If `CFLAGS' was defined, use that.
ifdef CFLAGS
+cflags := $(filter-out -I%,$(CFLAGS))
endif # CFLAGS
endif # +cflags
# If none of the above worked, default to "-g -O".
ifeq "$(strip $(+cflags))" ""
+cflags := $(default_cflags)
endif # $(+cflags) == ""
+cflags += $(cflags-cpu) $(+gccwarn) $(+merge-constants) $(+math-flags)
+gcc-nowarn := -w
# Don't duplicate options if we inherited variables from the parent.
+cflags := $(sort $(+cflags))
# Each sysdeps directory can contain header files that both will be
# used to compile and will be installed. Each can also contain an
# include/ subdirectory, whose header files will be used to compile
# but will not be installed, and will take precedence over the
# installed files. This mirrors the top-level include/ subdirectory.
+sysdep-includes := $(foreach dir,$(+sysdep_dirs),\
$(addprefix -I,$(wildcard $(dir)/include) $(dir)))
# These are flags given to the C compiler to tell it to look for
# include files (including ones given in angle brackets) in the parent
# library source directory, in the include directory, and in the
# current directory.
+includes = -I$(..)include $(if $(subdir),$(objpfx:%/=-I%)) \
$(+sysdep-includes) $(includes) \
$(patsubst %/,-I%,$(..)) $(libio-include) -I. $(sysincludes)
# Since libio has several internal header files, we use a -I instead
# of many little headers in the include directory.
libio-include = -I$(..)libio
# These are the variables that the implicit compilation rules use.
# Note that we can't use -std=* in CPPFLAGS, because it overrides
# the implicit -lang-asm and breaks cpp behavior for .S files--notably
# it causes cpp to stop predefining __ASSEMBLER__.
CPPFLAGS = $(CPPUNDEFS) $(CPPFLAGS-config) $($(subdir)-CPPFLAGS) \
$(+includes) $(defines) \
-include $(..)include/libc-symbols.h $(sysdep-CPPFLAGS) \
$(CPPFLAGS-$(suffix $@)) \
$(foreach lib,$(libof-$(basename $(@F))) \
$(libof-$(<F)) $(libof-$(@F)),$(CPPFLAGS-$(lib))) \
$(CPPFLAGS-$(<F)) $(CPPFLAGS-$(@F)) $(CPPFLAGS-$(basename $(@F)))
override CFLAGS = -std=gnu99 $(gnu89-inline-CFLAGS) $(config-extra-cflags) \
$(filter-out %frame-pointer,$(+cflags)) $(+gccwarn-c) \
$(sysdep-CFLAGS) $(CFLAGS-$(suffix $@)) $(CFLAGS-$(<F)) \
$(CFLAGS-$(@F)) \
$(foreach lib,$(libof-$(basename $(@F))) \
$(libof-$(<F)) $(libof-$(@F)),$(CFLAGS-$(lib)))
override CXXFLAGS = $(c++-sysincludes) \
$(filter-out %frame-pointer,$(+cflags)) $(sysdep-CFLAGS) \
$(CFLAGS-$(suffix $@)) $(CFLAGS-$(<F)) $(CFLAGS-$(@F))
# If everything is compiled with -fPIC (implicitly) we must tell this by
# defining the PIC symbol.
ifeq (yes,$(build-pic-default))
pic-default = -DPIC
# Enable object files for different versions of the library.
# Various things use $(object-suffixes) to know what all to make.
# The compilation rules use $(CPPFLAGS-${SUFFIX}) and $(CFLAGS-${SUFFIX})
# to pass different flags for each flavor.
libtypes = $(foreach o,$(object-suffixes-for-libc),$(libtype$o))
all-object-suffixes := .o .os .op .og .oS
object-suffixes :=
CPPFLAGS-.o = $(pic-default)
CFLAGS-.o = $(filter %frame-pointer,$(+cflags))
libtype.o := lib%.a
object-suffixes += .o
ifeq (yes,$(build-shared))
# Under --enable-shared, we will build a shared library of PIC objects.
# The PIC object files are named foo.os.
object-suffixes += .os
CFLAGS-.os = $(filter %frame-pointer,$(+cflags)) $(pic-ccflag)
libtype.os := lib%_pic.a
# This can be changed by a sysdep makefile
pic-ccflag = -fPIC
# This one should always stay like this unless there is a very good reason.
PIC-ccflag = -fPIC
# This can be changed by a sysdep makefile
pie-ccflag = -fpie
# This one should always stay like this unless there is a very good reason.
PIE-ccflag = -fPIE
ifeq (yes,$(build-profile))
# Under --enable-profile, we will build a static library of profiled objects.
# The profiled object files are named foo.op.
object-suffixes += .op
CPPFLAGS-.op = -DPROF $(pic-default)
CFLAGS-.op = -pg
libtype.op = lib%_p.a
# Convenience variable for when we want to treat shared-library cases
# differently from the rest.
object-suffixes-noshared := $(filter-out .os,$(object-suffixes))
object-suffixes-for-libc := $(object-suffixes)
ifeq (yes,$(build-shared))
# Build special library that contains the static-only routines for libc.
object-suffixes-for-libc += .oS
# Must build the routines as PIC, though, because they can end up in (users')
# shared objects. We don't want to use CFLAGS-os because users may, for
# example, make that processor-specific.
CFLAGS-.oS = $(CFLAGS-.o) $(PIC-ccflag)
libtype.oS = lib%_nonshared.a
# The assembler can generate debug information too.
ifndef ASFLAGS
ASFLAGS := $(filter -g% -fdebug-prefix-map=%,$(CFLAGS))
ASFLAGS += $(ASFLAGS-config) $(asflags-cpu)
ifndef BUILD_CC
move-if-change = $(SHELL) $(..)scripts/move-if-change
-include $(common-objpfx)sysd-sorted
subdirs = $(sorted-subdirs)
subdir-srcdirs = $(foreach dir,$(subdirs),\
$(firstword $($(dir)-srcdir) $(..)$(dir)))
# This is a pair of implicit rules to preprocess a file with # comments,
# %ifdef et al, based on config.h settings or other %include'd files.
# We use chained rules instead of a pipeline here so that we can properly
# check the exit status of cpp rather than using its bad output when there
# is a preprocessing error. Another rule should depend on the output file
# `FOO.v', and along with that `FOO.v.i' should be given dependencies
# listing both its input files, and any header files that it may reference
# (but no commands).
%.v.i: $(common-objpfx)config.h $(..)Makeconfig
sed '/^[ ]*%/!s/#.*$$//;/^[ ]*$$/d;s/^[ ]*%/#/' \
$(filter-out FORCE %.h $(..)Makeconfig,$^) \
| $(CC) -E -undef $(CPPFLAGS) -x assembler-with-cpp - \
> $@T
mv -f $@T $@
%.v: %.v.i
sed '/^[ ]*#/d;/^[ ]*$$/d' $< > $@T
mv -f $@T $@
ifeq (yes, $(build-shared))
# To generate a header to support more than one ABI for different
# architecture variants, the CPU/Makefile defines abi-variants to be a
# list of names for those variants (e.g. 32 64), and, for each variant,
# defines abi-$(variant)-condition to be the condition for those options
# to use in a C #if condition. abi-includes may be defined to a list of
# headers to include in the generated header, if the default does not
# suffice. default-abi is defined to be the ABI for the current glibc
# build.
ifndef abi-includes
abi-includes := bits/wordsize.h
# Process the shlib-versions file, which tells us what shared library
# version numbers to use when we install shared objects on this system.
# We need to wait until $(subdirs) is complete.
ifeq ($(sysd-sorted-done),t)
-include $(common-objpfx)
ifndef avoid-generated
# This lets add-ons give more-specific matches that override defaults
# in the top-level file.
$(common-objpfx)shlib-versions.v.i: \
$(wildcard $(+sysdep_dirs:=/shlib-versions) \
$(subdir-srcdirs:=/shlib-versions)) \
soversions-default-setname = $(patsubst %, %,\
$(filter-out %_default,\
$(common-objpfx)soversions.i: $(..)scripts/soversions.awk \
$(AWK) -v default_setname='$(soversions-default-setname)' \
-v cpu='$(config-machine)' \
-v vendor='$(config-vendor)' \
-v os='$(config-os)' \
-f $^ > $@T
mv -f $@T $@
$(common-objpfx) $(common-objpfx)soversions.i $(..)Makeconfig
(while read which lib number setname; do \
eval seen_$$which=1; \
test x"$$which" != xABI || echo abi-name = "$$lib"; \
test x"$$which" = xDEFAULT || continue; \
case $$number in \
[0-9]*) echo "$$$$number"; \
echo "all-sonames+=$$lib=$$\$$($$";;\
*) echo "$$\$$(if \$$(abi-$(default-abi)-$$lib-soname),\$$(abi-$(default-abi)-$$lib-soname),$$number)"; \
echo "all-sonames+=$$lib=\$$($$";;\
esac; \
done; \
echo = t;) < $< > $@T; exit 0
mv -f $@T $@
postclean-generated += soversions.i \
shlib-versions.v shlib-versions.v.i
# Generate the header containing the names of all shared libraries.
# We use a stamp file to avoid unnecessary recompilations.
before-compile += $(common-objpfx)gnu/lib-names.h
ifeq ($(,t)
$(common-objpfx)gnu/lib-names.h: $(common-objpfx)gnu/lib-names.stmp; @:
$(common-objpfx)gnu/lib-names.stmp: $(..)scripts/lib-names.awk \
{ \
echo '/* This file is automatically generated.';\
echo ' It defines macros to allow user program to find the shared'; \
echo ' library files which come as part of GNU libc. */'; \
echo '#ifndef __GNU_LIB_NAMES_H'; \
echo '#define __GNU_LIB_NAMES_H 1'; \
echo ''; \
$(if $(abi-includes), \
$(foreach h,$(abi-includes), echo '#include <$(h)>';) \
echo '';) \
$(if $(abi-variants), \
$(foreach v,$(abi-variants),\
$(if $(abi-$(v)-condition),\
echo '#if $(abi-$(v)-condition)'; \
($(foreach s,$(all-sonames), \
$(if $(abi-$(v)-$(firstword $(subst =, ,$(s)))-soname),\
echo $(firstword $(subst =, ,$(s)))=$(abi-$(v)-$(firstword $(subst =, ,$(s)))-soname);, \
echo $(s);))) \
| LC_ALL=C $(AWK) -v multi=1 -f $(firstword $^) | LC_ALL=C sort;) \
$(if $(abi-$(v)-condition),echo '#endif';)), \
($(foreach s,$(all-sonames), echo $(s);)) \
| LC_ALL=C $(AWK) -f $(firstword $^) | LC_ALL=C sort;) \
echo ''; \
echo '#endif /* gnu/lib-names.h */'; \
} > ${@:stmp=T}
$(move-if-change) ${@:stmp=T} ${@:stmp=h}
touch $@
common-generated += gnu/lib-names.h gnu/lib-names.stmp
# The name under which the run-time dynamic linker is installed.
# We are currently going for the convention that `/lib/'
# names the SVR4/ELF ABI-compliant dynamic linker.
ifndef rtld-installed-name
rtld-installed-name = $(
rtld-installed-name =
ifndef rtld-version-installed-name
rtld-version-installed-name = ld-$(version).so
endif # build-shared
ifeq ($(build-shared),yes)
libdl = $(common-objpfx)dlfcn/$(
libdl = $(common-objpfx)dlfcn/libdl.a
ifeq ($(build-shared),yes)
libm = $(common-objpfx)math/$(
libm = $(common-objpfx)math/libm.a
# These are the subdirectories containing the library source. The order
# is more or less arbitrary. The sorting step will take care of the
# dependencies.
all-subdirs = csu assert ctype locale intl catgets math setjmp signal \
stdlib stdio-common libio malloc string wcsmbs time dirent \
grp pwd posix io termios resource misc socket sysvipc gmon \
gnulib iconv iconvdata wctype manual shadow gshadow po argp \
crypt localedata timezone rt conform debug \
$(add-on-subdirs) dlfcn elf
ifndef avoid-generated
# sysd-sorted itself will contain rules making the sysd-sorted target
# depend on Depend files. But if you just added a Depend file to an
# existing directory not in all-subdirs, then sysd-sorted needs to
# be regenerated, so it depends on existing $(sorted-subdirs:=/Depend) files.
all-Depend-files := $(wildcard $(sort \
$(foreach dir,$(all-subdirs),\
$(firstword $($(dir)-srcdir) \
$(..)$(dir))/Depend) \
$(common-objpfx)sysd-sorted: $(..)scripts/gen-sorted.awk \
$(common-objpfx)config.make $(..)Makeconfig \
$(wildcard $(sysdirs:=/Subdirs)) \
$(AWK) -f $< \
-v subdirs='$(all-subdirs)' \
-v srcpfx='$(..)' \
$(filter %/Subdirs %/Depend,$^) > $@-tmp
mv -f $@-tmp $@
$(all-Depend-files): ;
# This gives partial TARGET:SOURCE pattern pairs to have rules
# emitted into sysd-rules. A sysdeps Makeconfig fragment can
# add its own special object file prefix to this list with e.g. foo-%:%
# to have foo-*.? compiled from *.? using $(foo-CPPFLAGS).
sysd-rules-patterns := %:% rtld-%:rtld-% rtld-%:% m_%:s_%
# Let sysdeps/ subdirs contain a Makeconfig fragment for us to include here.
sysdep-makeconfigs := $(wildcard $(+sysdep_dirs:=/Makeconfig))
ifneq (,$(sysdep-makeconfigs))
include $(sysdep-makeconfigs)
# Compute just the target patterns. Makeconfig has set sysd-rules-patterns.
sysd-rules-targets := $(sort $(foreach p,$(sysd-rules-patterns),\
$(firstword $(subst :, ,$p))))
# A sysdeps Makeconfig fragment may set libc-reentrant to yes.
ifeq (yes,$(libc-reentrant))
defines += -D_LIBC_REENTRANT
libio-mtsafe = -D_IO_MTSAFE_IO
endif # Makeconfig not yet included
# Local Variables:
# mode: makefile
# End: