mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-11-30 08:09:04 +00:00
27 lines
1.2 KiB
Plaintext
27 lines
1.2 KiB
Plaintext
# 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.])
|
|
])
|