Eric Blake wrote: > * gnulib-tool (func_dest_tmpfilename, func_create_testdir): Using > obsolete AC_GNU_SOURCE causes out-of-order expansion; avoid it, > and rely solely on gl_USE_SYSTEM_EXTENSIONS.
This patch introduces "AC_COMPILE_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS" warnings in gettext, with autoconf 2.63. (gettext uses AC_GNU_SOURCE in a couple of places, and even though the macro is marked obsolete, it's not invalid to use it.) As explained in <http://news.gmane.org/gmane.comp.sysutils.autoconf.bugs/cutoff=6480>, the bug is that AC_GNU_SOURCE invokes rather than requires AC_USE_SYSTEM_EXTENSIONS. I'm adding this workaround. In case that it introduces warnings with the current autoconf HEAD, the fix will be to fix AC_GNU_SOURCE in the first place. 2009-01-25 Bruno Haible <br...@clisp.org> Make it possible again to use AC_GNU_SOURCE together with gnulib. * m4/extensions.m4 (gl_USE_SYSTEM_EXTENSIONS): Require AC_GNU_SOURCE before requiring AC_USE_SYSTEM_EXTENSIONS. --- m4/extensions.m4.orig 2009-01-25 13:14:54.000000000 +0100 +++ m4/extensions.m4 2009-01-25 13:04:12.000000000 +0100 @@ -1,7 +1,7 @@ -# serial 6 -*- Autoconf -*- +# serial 7 -*- Autoconf -*- # Enable extensions on systems that normally disable them. -# Copyright (C) 2003, 2006-2008 Free Software Foundation, Inc. +# Copyright (C) 2003, 2006-2009 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. @@ -91,4 +91,14 @@ # 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])]) +[ + dnl Require this macro before AC_USE_SYSTEM_EXTENSIONS. + dnl gnulib does not need it. But if it gets required by third-party macros + dnl after AC_USE_SYSTEM_EXTENSIONS is required, autoconf 2.62..2.63 emit a + dnl warning: "AC_COMPILE_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS". + dnl Note: We can do this only for one of the macros AC_AIX, AC_GNU_SOURCE, + dnl AC_MINIX. If people still use AC_AIX or AC_MINIX, they are out of luck. + AC_REQUIRE([AC_GNU_SOURCE]) + + AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) +])
