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authorAndreas Rottmann <a.rottmann@gmx.at>2009-09-14 12:34:39 +0200
committerAndreas Rottmann <a.rottmann@gmx.at>2009-09-14 12:34:39 +0200
commit79ca645d222db2e158784642c3b464a47bea26f3 (patch)
tree73fa0e7f2f509013ca7ea3395b268c8471b2355b /gnulib-m4/mode_t.m4
parent8a927bfd7da41dbe61f3cfeaccbd37c761c0bc36 (diff)
parent3bebb94360f1c2333feb8d504a9fa4f96984d8b7 (diff)
Merge commit 'upstream/0.9.1.1'
Diffstat (limited to 'gnulib-m4/mode_t.m4')
-rw-r--r--gnulib-m4/mode_t.m426
1 files changed, 26 insertions, 0 deletions
diff --git a/gnulib-m4/mode_t.m4 b/gnulib-m4/mode_t.m4
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+++ b/gnulib-m4/mode_t.m4
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+# mode_t.m4 serial 1
+dnl Copyright (C) 2009 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.
+
+# For using mode_t, it's sufficient to use AC_TYPE_MODE_T and
+# include <sys/types.h>.
+
+# Define PROMOTED_MODE_T to the type that is the result of "default argument
+# promotion" (ISO C 6.5.2.2.(6)) of the type mode_t.
+AC_DEFUN([gl_PROMOTED_TYPE_MODE_T],
+[
+ AC_REQUIRE([AC_TYPE_MODE_T])
+ AC_CACHE_CHECK([for promoted mode_t type], [gl_cv_promoted_mode_t], [
+ dnl Assume mode_t promotes to 'int' if and only if it is smaller than 'int',
+ dnl and to itself otherwise. This assumption is not guaranteed by the ISO C
+ dnl standard, but we don't know of any real-world counterexamples.
+ AC_TRY_COMPILE([#include <sys/types.h>],
+ [typedef int array[2 * (sizeof (mode_t) < sizeof (int)) - 1];],
+ [gl_cv_promoted_mode_t='int'],
+ [gl_cv_promoted_mode_t='mode_t'])
+ ])
+ AC_DEFINE_UNQUOTED([PROMOTED_MODE_T], [$gl_cv_promoted_mode_t],
+ [Define to the type that is the result of default argument promotions of type mode_t.])
+])