| 1 | dnl Reentrant time functions like localtime_r.
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| 2 |
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| 3 | dnl Copyright (C) 2003, 2006 Free Software Foundation, Inc.
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| 4 | dnl This file is free software; the Free Software Foundation
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| 5 | dnl gives unlimited permission to copy and/or distribute it,
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| 6 | dnl with or without modifications, as long as this notice is preserved.
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| 7 |
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| 8 | dnl Written by Paul Eggert.
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| 9 |
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| 10 | AC_DEFUN([gl_TIME_R],
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| 11 | [
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| 12 | AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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| 13 | AC_REQUIRE([AC_C_RESTRICT])
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| 14 |
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| 15 | AC_CACHE_CHECK([whether localtime_r is compatible with its POSIX signature],
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| 16 | [gl_cv_time_r_posix],
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| 17 | [AC_TRY_COMPILE(
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| 18 | [#include <time.h>],
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| 19 | [/* We don't need to append 'restrict's to the argument types,
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| 20 | even though the POSIX signature has the 'restrict's,
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| 21 | since C99 says they can't affect type compatibility. */
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| 22 | struct tm * (*ptr) (time_t const *, struct tm *) = localtime_r;
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| 23 | if (ptr) return 0;],
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| 24 | [gl_cv_time_r_posix=yes],
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| 25 | [gl_cv_time_r_posix=no])])
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| 26 | if test $gl_cv_time_r_posix = yes; then
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| 27 | AC_DEFINE([HAVE_TIME_R_POSIX], 1,
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| 28 | [Define to 1 if localtime_r, etc. have the type signatures that
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| 29 | POSIX requires.])
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| 30 | else
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| 31 | AC_LIBOBJ([time_r])
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| 32 | gl_PREREQ_TIME_R
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| 33 | fi
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| 34 | ])
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| 35 |
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| 36 | # Prerequisites of lib/time_r.c.
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| 37 | AC_DEFUN([gl_PREREQ_TIME_R], [
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| 38 | :
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| 39 | ])
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