| # mode_t.m4 serial 2 | |
| dnl Copyright (C) 2009-2023 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.]) | |
| ]) | |