Re: coreutils bootstrap failing?

[Paul Eggert]

Jim Meyering <address@hidden> writes:

> ./bootstrap: aclocal --force -I m4 ...
> configure.ac:39: warning: AC_COMPILE_IFELSE was called before 
> AC_USE_SYSTEM_EXTENSIONS

Thanks for reporting that.  I installed the following, and hope it
fixes things for you.  At least, I bootstrapped successfully from
scratch after it.  Dunno why I missed it before, perhaps because I
didn't do a full bootstrap.

2006-10-12  Paul Eggert  <address@hidden>

        * m4/extensions.m4 (AC_USE_SYSTEM_EXTENSIONS): Renamed from
        gl_USE_SYSTEM_EXTENSIONS, to fix a coreutils bootstrap failure
        reported by Jim Meyering.  All uses of cache variables renamed
        to match Autoconf's.
        (gl_USE_SYSTEM_EXTENSIONS): New macro, which simply requires
        the other one.

--- m4/extensions.m4    11 Oct 2006 23:12:36 -0000      1.12
+++ m4/extensions.m4    12 Oct 2006 08:01:18 -0000      1.13
@@ -1,4 +1,4 @@
-# serial 3  -*- Autoconf -*-
+# serial 4  -*- Autoconf -*-
 # Enable extensions on systems that normally disable them.
 
 # Copyright (C) 2003, 2006 Free Software Foundation, Inc.
@@ -6,19 +6,17 @@
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
 
-# The main body of this macro is stolen from CVS Autoconf.  Perhaps we
-# can replace it with AC_USE_SYSTEM_EXTENSIONS once we can assume
-# Autoconf 2.61 or later everywhere, but since CVS Autoconf mutates
-# rapidly enough in this area it's likely that we'll need
-# gl_USE_SYSTEM_EXTENSIONS for quite some time.
+# This definition of AC_USE_SYSTEM_EXTENSIONS is stolen from CVS
+# Autoconf.  Perhaps we can remove this once we can assume Autoconf
+# 2.61 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.
 
-# _gl_TANDEM_SOURCE
-
-# gl_USE_SYSTEM_EXTENSIONS
+# AC_USE_SYSTEM_EXTENSIONS
 # ------------------------
 # Enable extensions on systems that normally disable them,
 # typically due to standards-conformance issues.
-AC_DEFUN([gl_USE_SYSTEM_EXTENSIONS],
+AC_DEFUN([AC_USE_SYSTEM_EXTENSIONS],
 [
   AC_BEFORE([$0], [AC_COMPILE_IFELSE])
   AC_BEFORE([$0], [AC_RUN_IFELSE])
@@ -39,15 +37,22 @@ AC_DEFUN([gl_USE_SYSTEM_EXTENSIONS],
 # undef _TANDEM_SOURCE
 #endif])
   AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__],
-    [gl_cv_safe_to_define___extensions__],
+    [ac_cv_safe_to_define___extensions__],
     [AC_COMPILE_IFELSE(
        [AC_LANG_PROGRAM([
 #        define __EXTENSIONS__ 1
          AC_INCLUDES_DEFAULT])],
-       [gl_cv_safe_to_define___extensions__=yes],
-       [gl_cv_safe_to_define___extensions__=no])])
-  test $gl_cv_safe_to_define___extensions__ = yes &&
+       [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([_POSIX_PTHREAD_SEMANTICS])
   AC_DEFINE([_TANDEM_SOURCE])
 ])
+
+# 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])])