| 1 | # Enable extensions on systems that normally disable them.
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| 2 |
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| 3 | # Copyright (C) 2003, 2006 Free Software Foundation, Inc.
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| 4 | # This file is free software; the Free Software Foundation
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| 5 | # gives unlimited permission to copy and/or distribute it,
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| 6 | # with or without modifications, as long as this notice is preserved.
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| 7 |
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| 8 | # This file is only needed in autoconf <= 2.59. Newer versions of autoconf
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| 9 | # have a macro AC_USE_SYSTEM_EXTENSIONS with identical semantics.
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| 10 |
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| 11 | # gl_USE_SYSTEM_EXTENSIONS
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| 12 | # ------------------------
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| 13 | # Enable extensions on systems that normally disable them,
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| 14 | # typically due to standards-conformance issues.
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| 15 | AC_DEFUN([gl_USE_SYSTEM_EXTENSIONS], [
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| 16 | AC_BEFORE([$0], [AC_COMPILE_IFELSE])
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| 17 | AC_BEFORE([$0], [AC_RUN_IFELSE])
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| 18 |
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| 19 | AC_REQUIRE([AC_GNU_SOURCE])
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| 20 | AC_REQUIRE([AC_AIX])
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| 21 | AC_REQUIRE([AC_MINIX])
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| 22 |
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| 23 | AH_VERBATIM([__EXTENSIONS__],
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| 24 | [/* Enable extensions on Solaris. */
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| 25 | #ifndef __EXTENSIONS__
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| 26 | # undef __EXTENSIONS__
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| 27 | #endif
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| 28 | #ifndef _POSIX_PTHREAD_SEMANTICS
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| 29 | # undef _POSIX_PTHREAD_SEMANTICS
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| 30 | #endif])
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| 31 | AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__],
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| 32 | [ac_cv_safe_to_define___extensions__],
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| 33 | [AC_COMPILE_IFELSE(
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| 34 | [AC_LANG_PROGRAM([
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| 35 | #define __EXTENSIONS__ 1
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| 36 | AC_INCLUDES_DEFAULT])],
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| 37 | [ac_cv_safe_to_define___extensions__=yes],
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| 38 | [ac_cv_safe_to_define___extensions__=no])])
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| 39 | test $ac_cv_safe_to_define___extensions__ = yes &&
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| 40 | AC_DEFINE([__EXTENSIONS__])
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| 41 | AC_DEFINE([_POSIX_PTHREAD_SEMANTICS])
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| 42 | ])
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