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authorAndreas Rottmann <a.rottmann@gmx.at>2010-05-27 18:23:15 +0200
committerAndreas Rottmann <a.rottmann@gmx.at>2010-05-27 18:23:15 +0200
commit3e0814cd9862b89c7a39672672937477bd87ddfb (patch)
tree159134a624e51509f40ed8823249f09a70d1dda3 /gnulib-m4/extensions.m4
parent3bebb94360f1c2333feb8d504a9fa4f96984d8b7 (diff)
Imported Upstream version 0.9.3upstream/0.9.3
Diffstat (limited to 'gnulib-m4/extensions.m4')
-rw-r--r--gnulib-m4/extensions.m422
1 files changed, 18 insertions, 4 deletions
diff --git a/gnulib-m4/extensions.m4 b/gnulib-m4/extensions.m4
index ba6d5e19..7d9458a8 100644
--- a/gnulib-m4/extensions.m4
+++ b/gnulib-m4/extensions.m4
@@ -1,7 +1,7 @@
-# serial 8 -*- Autoconf -*-
+# serial 9 -*- Autoconf -*-
# Enable extensions on systems that normally disable them.
-# Copyright (C) 2003, 2006-2009 Free Software Foundation, Inc.
+# Copyright (C) 2003, 2006-2010 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.
@@ -12,6 +12,20 @@
# enough in this area it's likely we'll need to redefine
# AC_USE_SYSTEM_EXTENSIONS for quite some time.
+# If autoconf reports a warning
+# warning: AC_COMPILE_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS
+# or warning: AC_RUN_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS
+# the fix is
+# 1) to ensure that AC_USE_SYSTEM_EXTENSIONS is never directly invoked
+# but always AC_REQUIREd,
+# 2) to ensure that for each occurrence of
+# AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+# or
+# AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+# the corresponding gnulib module description has 'extensions' among
+# its dependencies. This will ensure that the gl_USE_SYSTEM_EXTENSIONS
+# invocation occurs in gl_EARLY, not in gl_INIT.
+
# AC_USE_SYSTEM_EXTENSIONS
# ------------------------
# Enable extensions on systems that normally disable them,
@@ -74,8 +88,8 @@ AC_BEFORE([$0], [AC_RUN_IFELSE])dnl
[ac_cv_safe_to_define___extensions__],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[
-# define __EXTENSIONS__ 1
- ]AC_INCLUDES_DEFAULT])],
+# 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 &&