GNU bug report logs - #13448
Cannot build Emacs 24.2.92

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#13448: closed (Cannot build Emacs 24.2.92)
Date: Tue, 15 Jan 2013 21:31:01 +0000

[Message part 1 (text/plain, inline)]

Your message dated Tue, 15 Jan 2013 13:30:21 -0800
with message-id <50F5CA6D.8040901 <at> cs.ucla.edu>
and subject line Re: bug#13448: Cannot build Emacs 24.2.92
has caused the debbugs.gnu.org bug report #13448,
regarding Cannot build Emacs 24.2.92
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


-- 
13448: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=13448
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Xue Fuqiao <xfq.free <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: Cannot build Emacs 24.2.92
Date: Tue, 15 Jan 2013 17:59:31 +0800

[Message part 3 (text/plain, inline)]

I configured Emacs pretest 24.2.92 using:

    ./configure --with-wide-int --enable-link-time-optimization --enable-gcc-warnings

Then I:

    make

After that:

See attachment.

I'm using Ubuntu 12.10 to build Emacs 24.2.92.
-- 
Best regards, Xue Fuqiao.
http://www.emacswiki.org/emacs/XueFuqiao

[make.txt (text/plain, attachment)]

[Message part 5 (message/rfc822, inline)]

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Xue Fuqiao <xfq.free <at> gmail.com>
Cc: Glenn Morris <rgm <at> gnu.org>, Andreas Schwab <schwab <at> linux-m68k.org>,
	13448-done <at> debbugs.gnu.org
Subject: Re: bug#13448: Cannot build Emacs 24.2.92
Date: Tue, 15 Jan 2013 13:30:21 -0800

Enabling link time optimization is a common enough need and
there's a simple fix that I think makes Emacs a bit clearer,
so I pushed the following patch to the trunk as bzr 111533
and I'm marking this as done.

The original problem feels like it might be a GCC problem --
GCC shouldn't be dumber (and presumably generate worse code)
merely because link-time optimization is enabled.  Do you
have the time to file a GCC bug report?

=== modified file 'lib-src/ChangeLog'
--- lib-src/ChangeLog	2013-01-02 16:13:04 +0000
+++ lib-src/ChangeLog	2013-01-15 21:24:53 +0000
@@ -1,3 +1,9 @@
+2013-01-15  Paul Eggert  <eggert <at> cs.ucla.edu>
+
+	* make-docfile.c (write_globals): Make it a bit clearer (Bug#13448).
+	This pacifies GCC 4.7.2 when Emacs is configured with
+	--enable-link-time-optimization and --enable-gcc-warnings.
+
 2013-01-01  Juanma Barranquero  <lekktu <at> gmail.com>
 
 	* makefile.w32-in (lisp1): Add macroexp.elc (bug#13320).

=== modified file 'lib-src/make-docfile.c'
--- lib-src/make-docfile.c	2013-01-01 09:11:05 +0000
+++ lib-src/make-docfile.c	2013-01-15 21:23:34 +0000
@@ -624,7 +624,7 @@
   qsort (globals, num_globals, sizeof (struct global), compare_globals);
   for (i = 0; i < num_globals; ++i)
     {
-      char const *type;
+      char const *type = 0;
 
       switch (globals[i].type)
 	{
@@ -649,7 +649,7 @@
 	  fatal ("not a recognized DEFVAR_", 0);
 	}
 
-      if (globals[i].type != FUNCTION)
+      if (type)
 	{
 	  fprintf (outfile, "  %s f_%s;\n", type, globals[i].name);
 	  fprintf (outfile, "#define %s globals.f_%s\n",

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