27 lines
1.2 KiB
Plaintext
27 lines
1.2 KiB
Plaintext
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# mode_t.m4 serial 2
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dnl Copyright (C) 2009-2023 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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# For using mode_t, it's sufficient to use AC_TYPE_MODE_T and
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# include <sys/types.h>.
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# Define PROMOTED_MODE_T to the type that is the result of "default argument
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# promotion" (ISO C 6.5.2.2.(6)) of the type mode_t.
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AC_DEFUN([gl_PROMOTED_TYPE_MODE_T],
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[
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AC_REQUIRE([AC_TYPE_MODE_T])
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AC_CACHE_CHECK([for promoted mode_t type], [gl_cv_promoted_mode_t], [
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dnl Assume mode_t promotes to 'int' if and only if it is smaller than 'int',
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dnl and to itself otherwise. This assumption is not guaranteed by the ISO C
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dnl standard, but we don't know of any real-world counterexamples.
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/types.h>]],
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[[typedef int array[2 * (sizeof (mode_t) < sizeof (int)) - 1];]])],
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[gl_cv_promoted_mode_t='int'],
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[gl_cv_promoted_mode_t='mode_t'])
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])
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AC_DEFINE_UNQUOTED([PROMOTED_MODE_T], [$gl_cv_promoted_mode_t],
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[Define to the type that is the result of default argument promotions of type mode_t.])
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])
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