Mercurial > gnulib
view m4/mode_t.m4 @ 40057:b06060465f09
maint: Run 'make update-copyright'
author | Paul Eggert <eggert@cs.ucla.edu> |
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date | Tue, 01 Jan 2019 00:25:11 +0100 |
parents | 10eb9086bea0 |
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# mode_t.m4 serial 2 dnl Copyright (C) 2009-2019 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_COMPILE_IFELSE([AC_LANG_PROGRAM([[#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.]) ])