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47 lines
1.5 KiB
47 lines
1.5 KiB
dnl A placeholder for POSIX 2008 <stddef.h>, for platforms that have issues. |
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# stddef_h.m4 serial 4 |
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dnl Copyright (C) 2009-2011 Free Software Foundation, Inc. |
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dnl This file is free software; the Free Software Foundation |
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dnl gives unlimited permission to copy and/or distribute it, |
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dnl with or without modifications, as long as this notice is preserved. |
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AC_DEFUN([gl_STDDEF_H], |
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[ |
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AC_REQUIRE([gl_STDDEF_H_DEFAULTS]) |
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AC_REQUIRE([gt_TYPE_WCHAR_T]) |
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STDDEF_H= |
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if test $gt_cv_c_wchar_t = no; then |
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HAVE_WCHAR_T=0 |
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STDDEF_H=stddef.h |
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fi |
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AC_CACHE_CHECK([whether NULL can be used in arbitrary expressions], |
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[gl_cv_decl_null_works], |
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[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stddef.h> |
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int test[2 * (sizeof NULL == sizeof (void *)) -1]; |
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]])], |
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[gl_cv_decl_null_works=yes], |
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[gl_cv_decl_null_works=no])]) |
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if test $gl_cv_decl_null_works = no; then |
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REPLACE_NULL=1 |
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STDDEF_H=stddef.h |
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fi |
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AC_SUBST([STDDEF_H]) |
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AM_CONDITIONAL([GL_GENERATE_STDDEF_H], [test -n "$STDDEF_H"]) |
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if test -n "$STDDEF_H"; then |
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gl_NEXT_HEADERS([stddef.h]) |
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fi |
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]) |
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AC_DEFUN([gl_STDDEF_MODULE_INDICATOR], |
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[ |
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dnl Use AC_REQUIRE here, so that the default settings are expanded once only. |
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AC_REQUIRE([gl_STDDEF_H_DEFAULTS]) |
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gl_MODULE_INDICATOR_SET_VARIABLE([$1]) |
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]) |
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AC_DEFUN([gl_STDDEF_H_DEFAULTS], |
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[ |
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dnl Assume proper GNU behavior unless another module says otherwise. |
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REPLACE_NULL=0; AC_SUBST([REPLACE_NULL]) |
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HAVE_WCHAR_T=1; AC_SUBST([HAVE_WCHAR_T]) |
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])
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