| 1 | # serial 4 -*- Autoconf -*-
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| 2 | # Enable extensions on systems that normally disable them.
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| 3 |
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| 4 | # Copyright (C) 2003, 2006 Free Software Foundation, Inc.
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| 5 | # This file is free software; the Free Software Foundation
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| 6 | # gives unlimited permission to copy and/or distribute it,
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| 7 | # with or without modifications, as long as this notice is preserved.
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| 8 |
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| 9 | # This definition of AC_USE_SYSTEM_EXTENSIONS is stolen from CVS
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| 10 | # Autoconf. Perhaps we can remove this once we can assume Autoconf
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| 11 | # 2.61 or later everywhere, but since CVS Autoconf mutates rapidly
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| 12 | # enough in this area it's likely we'll need to redefine
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| 13 | # AC_USE_SYSTEM_EXTENSIONS for quite some time.
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| 14 |
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| 15 | # AC_USE_SYSTEM_EXTENSIONS
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| 16 | # ------------------------
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| 17 | # Enable extensions on systems that normally disable them,
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| 18 | # typically due to standards-conformance issues.
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| 19 | AC_DEFUN([AC_USE_SYSTEM_EXTENSIONS],
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| 20 | [
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| 21 | AC_BEFORE([$0], [AC_COMPILE_IFELSE])
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| 22 | AC_BEFORE([$0], [AC_RUN_IFELSE])
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| 23 |
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| 24 | AC_REQUIRE([AC_GNU_SOURCE])
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| 25 | AC_REQUIRE([AC_AIX])
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| 26 | AC_REQUIRE([AC_MINIX])
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| 27 |
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| 28 | AH_VERBATIM([__EXTENSIONS__],
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| 29 | [/* Enable extensions on Solaris. */
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| 30 | #ifndef __EXTENSIONS__
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| 31 | # undef __EXTENSIONS__
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| 32 | #endif
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| 33 | #ifndef _POSIX_PTHREAD_SEMANTICS
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| 34 | # undef _POSIX_PTHREAD_SEMANTICS
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| 35 | #endif
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| 36 | #ifndef _TANDEM_SOURCE
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| 37 | # undef _TANDEM_SOURCE
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| 38 | #endif])
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| 39 | AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__],
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| 40 | [ac_cv_safe_to_define___extensions__],
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| 41 | [AC_COMPILE_IFELSE(
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| 42 | [AC_LANG_PROGRAM([
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| 43 | # define __EXTENSIONS__ 1
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| 44 | AC_INCLUDES_DEFAULT])],
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| 45 | [ac_cv_safe_to_define___extensions__=yes],
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| 46 | [ac_cv_safe_to_define___extensions__=no])])
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| 47 | test $ac_cv_safe_to_define___extensions__ = yes &&
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| 48 | AC_DEFINE([__EXTENSIONS__])
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| 49 | AC_DEFINE([_POSIX_PTHREAD_SEMANTICS])
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| 50 | AC_DEFINE([_TANDEM_SOURCE])
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| 51 | ])
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| 52 |
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| 53 | # gl_USE_SYSTEM_EXTENSIONS
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| 54 | # ------------------------
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| 55 | # Enable extensions on systems that normally disable them,
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| 56 | # typically due to standards-conformance issues.
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| 57 | AC_DEFUN([gl_USE_SYSTEM_EXTENSIONS],
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| 58 | [AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])])
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