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annotate m4/mode_t.m4 @ 14434:7624b26aea3d

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sys_socket, netdb: Document problem with socklen_t. * doc/posix-headers/sys_socket.texi: Mention lack of socklen_t on some platforms. * doc/posix-headers/netdb.texi: Likewise.
author Bruno Haible <bruno@clisp.org>
date Sat, 19 Mar 2011 13:39:12 +0100
parents 97fc9a21a8fb
children 8250f2777afc
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1 # mode_t.m4 serial 2
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2 dnl Copyright (C) 2009-2011 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 ])