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43 lines
1.4 KiB
Plaintext
43 lines
1.4 KiB
Plaintext
# Enable extensions on systems that normally disable them.
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# Copyright (C) 2003, 2006 Free Software Foundation, Inc.
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# This file is free software; the Free Software Foundation
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# gives unlimited permission to copy and/or distribute it,
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# with or without modifications, as long as this notice is preserved.
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# This file is only needed in autoconf <= 2.59. Newer versions of autoconf
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# have a macro AC_USE_SYSTEM_EXTENSIONS with identical semantics.
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# gl_USE_SYSTEM_EXTENSIONS
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# ------------------------
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# Enable extensions on systems that normally disable them,
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# typically due to standards-conformance issues.
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AC_DEFUN([gl_USE_SYSTEM_EXTENSIONS], [
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AC_BEFORE([$0], [AC_COMPILE_IFELSE])
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AC_BEFORE([$0], [AC_RUN_IFELSE])
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AC_REQUIRE([AC_GNU_SOURCE])
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AC_REQUIRE([AC_AIX])
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AC_REQUIRE([AC_MINIX])
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AH_VERBATIM([__EXTENSIONS__],
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[/* Enable extensions on Solaris. */
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#ifndef __EXTENSIONS__
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# undef __EXTENSIONS__
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#endif
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#ifndef _POSIX_PTHREAD_SEMANTICS
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# undef _POSIX_PTHREAD_SEMANTICS
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#endif])
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AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__],
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[ac_cv_safe_to_define___extensions__],
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[AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM([
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#define __EXTENSIONS__ 1
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AC_INCLUDES_DEFAULT])],
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[ac_cv_safe_to_define___extensions__=yes],
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[ac_cv_safe_to_define___extensions__=no])])
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test $ac_cv_safe_to_define___extensions__ = yes &&
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AC_DEFINE([__EXTENSIONS__])
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AC_DEFINE([_POSIX_PTHREAD_SEMANTICS])
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])
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