99 lines
3.3 KiB
Diff
99 lines
3.3 KiB
Diff
--- m4/extensions.m4
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+++ m4/extensions.m4
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@@ -1,14 +1,14 @@
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-# serial 4 -*- Autoconf -*-
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+# serial 5 -*- Autoconf -*-
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# Enable extensions on systems that normally disable them.
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-# Copyright (C) 2003, 2006 Free Software Foundation, Inc.
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+# Copyright (C) 2003, 2006-2008 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 definition of AC_USE_SYSTEM_EXTENSIONS is stolen from CVS
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# Autoconf. Perhaps we can remove this once we can assume Autoconf
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-# 2.61 or later everywhere, but since CVS Autoconf mutates rapidly
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+# 2.62 or later everywhere, but since CVS Autoconf mutates rapidly
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# enough in this area it's likely we'll need to redefine
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# AC_USE_SYSTEM_EXTENSIONS for quite some time.
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@@ -16,39 +16,63 @@
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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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+# Remember that #undef in AH_VERBATIM gets replaced with #define by
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+# AC_DEFINE. The goal here is to define all known feature-enabling
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+# macros, then, if reports of conflicts are made, disable macros that
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+# cause problems on some platforms (such as __EXTENSIONS__).
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AC_DEFUN([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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-
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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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+[AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl
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+AC_BEFORE([$0], [AC_RUN_IFELSE])dnl
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+
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+ AC_CHECK_HEADER([minix/config.h], [MINIX=yes], [MINIX=])
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+ if test "$MINIX" = yes; then
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+ AC_DEFINE([_POSIX_SOURCE], [1],
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+ [Define to 1 if you need to in order for `stat' and other
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+ things to work.])
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+ AC_DEFINE([_POSIX_1_SOURCE], [2],
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+ [Define to 2 if the system does not provide POSIX.1 features
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+ except with this defined.])
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+ AC_DEFINE([_MINIX], [1],
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+ [Define to 1 if on MINIX.])
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+ fi
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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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+[/* Enable extensions on AIX 3, Interix. */
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+#ifndef _ALL_SOURCE
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+# undef _ALL_SOURCE
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#endif
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+/* Enable GNU extensions on systems that have them. */
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+#ifndef _GNU_SOURCE
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+# undef _GNU_SOURCE
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+#endif
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+/* Enable threading extensions on Solaris. */
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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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+/* Enable extensions on HP NonStop. */
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#ifndef _TANDEM_SOURCE
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# undef _TANDEM_SOURCE
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-#endif])
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+#endif
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+/* Enable general extensions on Solaris. */
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+#ifndef __EXTENSIONS__
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+# undef __EXTENSIONS__
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+#endif
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+])
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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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+ [AC_LANG_PROGRAM([[
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# define __EXTENSIONS__ 1
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- AC_INCLUDES_DEFAULT])],
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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([_ALL_SOURCE])
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+ AC_DEFINE([_GNU_SOURCE])
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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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+])# AC_USE_SYSTEM_EXTENSIONS
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# gl_USE_SYSTEM_EXTENSIONS
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# ------------------------
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