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authorThomas White <taw@bitwiz.org.uk>2010-12-07 19:58:08 -0700
committerThomas White <taw@physics.org>2012-02-22 15:27:08 +0100
commit508de274d96794a194694cf75b9711d1b8882301 (patch)
treee64d398aa018c67786eac3e25d85892e92f53e41 /m4/stddef_h.m4
parent37aa7fb6df90c0027e1589f7e15a84f527e5ffe0 (diff)
Add Gnulib m4 files
Diffstat (limited to 'm4/stddef_h.m4')
-rw-r--r--m4/stddef_h.m445
1 files changed, 45 insertions, 0 deletions
diff --git a/m4/stddef_h.m4 b/m4/stddef_h.m4
new file mode 100644
index 00000000..c3ae5694
--- /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, 2010 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])
+])