| dnl A placeholder for <stddef.h>, for platforms that have issues. |
| # stddef_h.m4 serial 5 |
| dnl Copyright (C) 2009-2017 Free Software Foundation, Inc. |
| dnl This file is free software; the Free Software Foundation |
| dnl gives unlimited permission to copy and/or distribute it, |
| dnl with or without modifications, as long as this notice is preserved. |
| |
| AC_DEFUN([gl_STDDEF_H], |
| [ |
| AC_REQUIRE([gl_STDDEF_H_DEFAULTS]) |
| AC_REQUIRE([gt_TYPE_WCHAR_T]) |
| STDDEF_H= |
| AC_CHECK_TYPE([max_align_t], [], [HAVE_MAX_ALIGN_T=0; STDDEF_H=stddef.h], |
| [[#include <stddef.h> |
| ]]) |
| if test $gt_cv_c_wchar_t = no; then |
| HAVE_WCHAR_T=0 |
| STDDEF_H=stddef.h |
| fi |
| AC_CACHE_CHECK([whether NULL can be used in arbitrary expressions], |
| [gl_cv_decl_null_works], |
| [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stddef.h> |
| int test[2 * (sizeof NULL == sizeof (void *)) -1]; |
| ]])], |
| [gl_cv_decl_null_works=yes], |
| [gl_cv_decl_null_works=no])]) |
| if test $gl_cv_decl_null_works = no; then |
| REPLACE_NULL=1 |
| STDDEF_H=stddef.h |
| fi |
| AC_SUBST([STDDEF_H]) |
| AM_CONDITIONAL([GL_GENERATE_STDDEF_H], [test -n "$STDDEF_H"]) |
| if test -n "$STDDEF_H"; then |
| gl_NEXT_HEADERS([stddef.h]) |
| fi |
| ]) |
| |
| AC_DEFUN([gl_STDDEF_MODULE_INDICATOR], |
| [ |
| dnl Use AC_REQUIRE here, so that the default settings are expanded once only. |
| AC_REQUIRE([gl_STDDEF_H_DEFAULTS]) |
| gl_MODULE_INDICATOR_SET_VARIABLE([$1]) |
| ]) |
| |
| AC_DEFUN([gl_STDDEF_H_DEFAULTS], |
| [ |
| dnl Assume proper GNU behavior unless another module says otherwise. |
| REPLACE_NULL=0; AC_SUBST([REPLACE_NULL]) |
| HAVE_MAX_ALIGN_T=1; AC_SUBST([HAVE_MAX_ALIGN_T]) |
| HAVE_WCHAR_T=1; AC_SUBST([HAVE_WCHAR_T]) |
| ]) |
