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author | Paul Eggert <eggert@cs.ucla.edu> | 2011-01-08 22:57:07 -0800 |
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committer | Paul Eggert <eggert@cs.ucla.edu> | 2011-01-08 22:57:07 -0800 |
commit | 1fd182f01815629114a83d6987568dce72cc6bf5 (patch) | |
tree | 17148e38af034214416d362909d5a3ec8c4e6c4a /m4/stddef_h.m4 | |
parent | e84aba69759680c3d2461570168aabf52c5e12aa (diff) | |
download | emacs-1fd182f01815629114a83d6987568dce72cc6bf5.tar.gz |
Regenerate.
Diffstat (limited to 'm4/stddef_h.m4')
-rw-r--r-- | m4/stddef_h.m4 | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/m4/stddef_h.m4 b/m4/stddef_h.m4 new file mode 100644 index 00000000000..3a5ecc57117 --- /dev/null +++ b/m4/stddef_h.m4 @@ -0,0 +1,45 @@ +dnl A placeholder for POSIX 2008 <stddef.h>, for platforms that have issues. +# stddef_h.m4 serial 2 +dnl Copyright (C) 2009-2011 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]) + 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 $gl_cv_decl_null_works = no; then + REPLACE_NULL=1 + STDDEF_H=stddef.h + fi + if test -n "$STDDEF_H"; then + gl_CHECK_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_WCHAR_T=1; AC_SUBST([HAVE_WCHAR_T]) + STDDEF_H=''; AC_SUBST([STDDEF_H]) +]) |