Bug 27898 - Compile failure with --combine and anonymous structures
Summary: Compile failure with --combine and anonymous structures
Status: RESOLVED FIXED
Alias: None
Product: gcc
Classification: Unclassified
Component: c (show other bugs)
Version: 4.1.0
: P3 normal
Target Milestone: ---
Assignee: Alexandre Oliva
URL: http://gcc.gnu.org/ml/gcc-patches/200...
Keywords: patch, rejects-valid
Depends on:
Blocks: 28779
  Show dependency tree / graph
 
Reported: 2006-06-05 09:55 UTC by David Woodhouse
Modified: 2007-11-26 16:24 UTC (History)
5 users (show)

See Also:
Host:
Target:
Build:
Known to work:
Known to fail:
Last reconfirmed: 2006-07-05 06:02:55

Attachments
Patch that fixes the bug (689 bytes, patch)
2006-07-05 06:04 UTC, Alexandre Oliva 		Details | Diff
View All Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.
Description David Woodhouse 2006-06-05 09:55:37 UTC 
$ cat foobar.c
union u {
        struct {
                int i;
        };
};

extern int somefunc(union u *);
$ gcc --combine -c foobar.c foobar.c
foobar.c:8: error: conflicting types for 'somefunc'
foobar.c:8: error: previous declaration of 'somefunc' was here

gcc version 4.1.0 20060304 (Red Hat 4.1.0-3)

Happens on both PowerPC and i386. If the internal structure is made non-anonymous, it compiles.
Comment 1 Alexandre Oliva 2006-07-05 06:04:21 UTC 
Created attachment 11822 [details]
Patch that fixes the bug

This patch fixes the problem for me.
Comment 2 patchapp@dberlin.org 2006-07-06 03:45:12 UTC 
Subject: Bug number PR27898

A patch for this bug has been added to the patch tracker.
The mailing list url for the patch is http://gcc.gnu.org/ml/gcc-patches/2006-07/msg00187.html
Comment 3 David Woodhouse 2006-08-13 10:30:49 UTC 
That simple test case seems to have been fixed with your patch -- thanks.
Next failure reported as PR28706.

Full test cases in Red Hat bug #194327 at https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=194327
Comment 4 Alexandre Oliva 2007-11-26 06:26:34 UTC 
Subject: Bug 27898

Author: aoliva
Date: Mon Nov 26 06:26:18 2007
New Revision: 130425

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=130425
Log:
PR c/27898
* c-typeck.c (tagged_types_tu_compatible_p): Enable exact
matches between anonymous union fields.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/c-typeck.c
Comment 5 Alexandre Oliva 2007-11-26 16:24:29 UTC 
Fixed.
Comment 6 uros 2009-03-25 07:59:10 UTC 
Subject: Bug 27898

Author: uros
Date: Wed Mar 25 07:58:55 2009
New Revision: 145052

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=145052
Log:
	PR c/27898
	* gcc.dg/pr27898.c: New test.

	PR tree-optimization/32139
	* gcc.c-torture/compile/pr32139.c: New test.


Added:
    trunk/gcc/testsuite/gcc.c-torture/compile/pr32139.c
    trunk/gcc/testsuite/gcc.dg/pr27898.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog