diff options
Diffstat (limited to 'libextra/gl/m4/extensions.m4')
| -rw-r--r-- | libextra/gl/m4/extensions.m4 | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/libextra/gl/m4/extensions.m4 b/libextra/gl/m4/extensions.m4 index 611fcfdbc4..ba6d5e190f 100644 --- a/libextra/gl/m4/extensions.m4 +++ b/libextra/gl/m4/extensions.m4 @@ -1,7 +1,7 @@ -# serial 6 -*- Autoconf -*- +# serial 8 -*- 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. @@ -20,7 +20,7 @@ # 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_DEFUN_ONCE([AC_USE_SYSTEM_EXTENSIONS], [AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl AC_BEFORE([$0], [AC_RUN_IFELSE])dnl @@ -90,5 +90,15 @@ AC_BEFORE([$0], [AC_RUN_IFELSE])dnl # ------------------------ # 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])]) +AC_DEFUN_ONCE([gl_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]) +]) |