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author | Ludovic Courtès <ludo@gnu.org> | 2008-08-21 22:23:59 +0200 |
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committer | Ludovic Courtès <ludo@gnu.org> | 2008-08-21 22:23:59 +0200 |
commit | 103dc4d4d297ed7522e36415869f60d81f9cbc5a (patch) | |
tree | fae864e72562f841ed95f3e5f36cc12b2de807c6 /m4/extensions.m4 | |
parent | 417566ebc9dc51fc65b490a96213059e17994dde (diff) | |
download | guile-103dc4d4d297ed7522e36415869f60d81f9cbc5a.tar.gz |
Add Gnulib-provided files for convenience.
These come from Gnulib's Git commit
ae3a0d62f26d8156b403e40d6007475006f3136f, dated 2008-08-19.
Diffstat (limited to 'm4/extensions.m4')
-rw-r--r-- | m4/extensions.m4 | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/m4/extensions.m4 b/m4/extensions.m4 new file mode 100644 index 000000000..917af9480 --- /dev/null +++ b/m4/extensions.m4 @@ -0,0 +1,82 @@ +# serial 5 -*- Autoconf -*- +# Enable extensions on systems that normally disable them. + +# Copyright (C) 2003, 2006-2008 Free Software Foundation, Inc. +# This file is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# This definition of AC_USE_SYSTEM_EXTENSIONS is stolen from CVS +# Autoconf. Perhaps we can remove this once we can assume Autoconf +# 2.62 or later everywhere, but since CVS Autoconf mutates rapidly +# enough in this area it's likely we'll need to redefine +# AC_USE_SYSTEM_EXTENSIONS for quite some time. + +# AC_USE_SYSTEM_EXTENSIONS +# ------------------------ +# Enable extensions on systems that normally disable them, +# typically due to standards-conformance issues. +# Remember that #undef in AH_VERBATIM gets replaced with #define by +# AC_DEFINE. The goal here is to define all known feature-enabling +# macros, then, if reports of conflicts are made, disable macros that +# cause problems on some platforms (such as __EXTENSIONS__). +AC_DEFUN([AC_USE_SYSTEM_EXTENSIONS], +[AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl +AC_BEFORE([$0], [AC_RUN_IFELSE])dnl + + AC_CHECK_HEADER([minix/config.h], [MINIX=yes], [MINIX=]) + if test "$MINIX" = yes; then + AC_DEFINE([_POSIX_SOURCE], [1], + [Define to 1 if you need to in order for `stat' and other + things to work.]) + AC_DEFINE([_POSIX_1_SOURCE], [2], + [Define to 2 if the system does not provide POSIX.1 features + except with this defined.]) + AC_DEFINE([_MINIX], [1], + [Define to 1 if on MINIX.]) + fi + + AH_VERBATIM([__EXTENSIONS__], +[/* Enable extensions on AIX 3, Interix. */ +#ifndef _ALL_SOURCE +# undef _ALL_SOURCE +#endif +/* Enable GNU extensions on systems that have them. */ +#ifndef _GNU_SOURCE +# undef _GNU_SOURCE +#endif +/* Enable threading extensions on Solaris. */ +#ifndef _POSIX_PTHREAD_SEMANTICS +# undef _POSIX_PTHREAD_SEMANTICS +#endif +/* Enable extensions on HP NonStop. */ +#ifndef _TANDEM_SOURCE +# undef _TANDEM_SOURCE +#endif +/* Enable general extensions on Solaris. */ +#ifndef __EXTENSIONS__ +# undef __EXTENSIONS__ +#endif +]) + AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__], + [ac_cv_safe_to_define___extensions__], + [AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM([[ +# define __EXTENSIONS__ 1 + ]AC_INCLUDES_DEFAULT])], + [ac_cv_safe_to_define___extensions__=yes], + [ac_cv_safe_to_define___extensions__=no])]) + test $ac_cv_safe_to_define___extensions__ = yes && + AC_DEFINE([__EXTENSIONS__]) + AC_DEFINE([_ALL_SOURCE]) + AC_DEFINE([_GNU_SOURCE]) + AC_DEFINE([_POSIX_PTHREAD_SEMANTICS]) + AC_DEFINE([_TANDEM_SOURCE]) +])# AC_USE_SYSTEM_EXTENSIONS + +# gl_USE_SYSTEM_EXTENSIONS +# ------------------------ +# Enable extensions on systems that normally disable them, +# typically due to standards-conformance issues. +AC_DEFUN([gl_USE_SYSTEM_EXTENSIONS], + [AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])]) |