Re: Gnulib needed in AC_CHECK_HEADERS

[Paul Eggert]

Well, it _has_ been 3 years.  If the backward-compatibility gorp is
causing real problems, perhaps it's time to bite the bullet and drop
it, something like the following.  This won't affect coreutils or
diffutils or tar or any modernish program.  What would it hurt?

diff --git a/NEWS b/NEWS
index adb0163..0261c13 100644
--- a/NEWS
+++ b/NEWS
@@ -6,6 +6,8 @@ User visible incompatible changes
 
 Date        Modules         Changes
 
+2007-12-22  alloca-opt      No longer defines HAVE_ALLOCA_H.
+
 2007-12-03  getpagesize     The include file is changed from "getpagesize.h"
                             to <unistd.h>.
 
diff --git a/m4/alloca.m4 b/m4/alloca.m4
index eb62e0e..95f54a6 100644
--- a/m4/alloca.m4
+++ b/m4/alloca.m4
@@ -1,5 +1,5 @@
-# alloca.m4 serial 7
-dnl Copyright (C) 2002-2004, 2006 Free Software Foundation, Inc.
+# alloca.m4 serial 8
+dnl Copyright (C) 2002-2004, 2006, 2007 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -39,10 +39,6 @@ AC_DEFUN([gl_FUNC_ALLOCA],
     ALLOCA_H=alloca.h
   fi
   AC_SUBST([ALLOCA_H])
-
-  AC_DEFINE(HAVE_ALLOCA_H, 1,
-    [Define HAVE_ALLOCA_H for backward compatibility with older code
-     that includes <alloca.h> only if HAVE_ALLOCA_H is defined.])
 ])
 
 # Prerequisites of lib/alloca.c.