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1 # mode_t.m4 serial 1 |
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2 dnl Copyright (C) 2009 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_TRY_COMPILE([#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 ]) |
