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37 lines
1.1 KiB
37 lines
1.1 KiB
dnl Provide AC_USE_SYSTEM_EXTENSIONS for old autoconf machines. |
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AC_DEFUN([ACX_USE_SYSTEM_EXTENSIONS],[ |
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ifdef([AC_USE_SYSTEM_EXTENSIONS],[ |
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AC_USE_SYSTEM_EXTENSIONS |
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],[ |
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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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#ifndef _TANDEM_SOURCE |
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# undef _TANDEM_SOURCE |
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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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AC_DEFINE([_TANDEM_SOURCE]) |
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]) |
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])
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