| 1 | # mode_t.m4 serial 2
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| 2 | dnl Copyright (C) 2009-2021 Free Software Foundation, Inc.
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| 3 | dnl This file is free software; the Free Software Foundation
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| 4 | dnl gives unlimited permission to copy and/or distribute it,
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| 5 | dnl with or without modifications, as long as this notice is preserved.
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| 6 |
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| 7 | # For using mode_t, it's sufficient to use AC_TYPE_MODE_T and
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| 8 | # include <sys/types.h>.
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| 9 |
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| 10 | # Define PROMOTED_MODE_T to the type that is the result of "default argument
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| 11 | # promotion" (ISO C 6.5.2.2.(6)) of the type mode_t.
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| 12 | AC_DEFUN([gl_PROMOTED_TYPE_MODE_T],
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| 13 | [
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| 14 | AC_REQUIRE([AC_TYPE_MODE_T])
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| 15 | AC_CACHE_CHECK([for promoted mode_t type], [gl_cv_promoted_mode_t], [
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| 16 | dnl Assume mode_t promotes to 'int' if and only if it is smaller than 'int',
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| 17 | dnl and to itself otherwise. This assumption is not guaranteed by the ISO C
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| 18 | dnl standard, but we don't know of any real-world counterexamples.
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| 19 | AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/types.h>]],
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| 20 | [[typedef int array[2 * (sizeof (mode_t) < sizeof (int)) - 1];]])],
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| 21 | [gl_cv_promoted_mode_t='int'],
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| 22 | [gl_cv_promoted_mode_t='mode_t'])
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| 23 | ])
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| 24 | AC_DEFINE_UNQUOTED([PROMOTED_MODE_T], [$gl_cv_promoted_mode_t],
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| 25 | [Define to the type that is the result of default argument promotions of type mode_t.])
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| 26 | ])
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