Commit | Line | Data |
---|---|---|
6ec2e0f5 | 1 | # mode_t.m4 serial 2 |
c0c3707f | 2 | dnl Copyright (C) 2009-2019 Free Software Foundation, Inc. |
6ec2e0f5 SDJ |
3 | dnl This file is free software; the Free Software Foundation |
4 | dnl gives unlimited permission to copy and/or distribute it, | |
5 | dnl with or without modifications, as long as this notice is preserved. | |
6 | ||
7 | # For using mode_t, it's sufficient to use AC_TYPE_MODE_T and | |
8 | # include <sys/types.h>. | |
9 | ||
10 | # Define PROMOTED_MODE_T to the type that is the result of "default argument | |
11 | # promotion" (ISO C 6.5.2.2.(6)) of the type mode_t. | |
12 | AC_DEFUN([gl_PROMOTED_TYPE_MODE_T], | |
13 | [ | |
14 | AC_REQUIRE([AC_TYPE_MODE_T]) | |
15 | AC_CACHE_CHECK([for promoted mode_t type], [gl_cv_promoted_mode_t], [ | |
16 | dnl Assume mode_t promotes to 'int' if and only if it is smaller than 'int', | |
17 | dnl and to itself otherwise. This assumption is not guaranteed by the ISO C | |
18 | dnl standard, but we don't know of any real-world counterexamples. | |
19 | AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/types.h>]], | |
20 | [[typedef int array[2 * (sizeof (mode_t) < sizeof (int)) - 1];]])], | |
21 | [gl_cv_promoted_mode_t='int'], | |
22 | [gl_cv_promoted_mode_t='mode_t']) | |
23 | ]) | |
24 | AC_DEFINE_UNQUOTED([PROMOTED_MODE_T], [$gl_cv_promoted_mode_t], | |
25 | [Define to the type that is the result of default argument promotions of type mode_t.]) | |
26 | ]) |