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* [Bug c/60797] New: gcc hangs with error: only weak aliases are supported in this configuration
@ 2014-04-09 19:31 junchao.zhang at gmail dot com
2014-04-09 19:44 ` [Bug c/60797] " dominiq at lps dot ens.fr
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: junchao.zhang at gmail dot com @ 2014-04-09 19:31 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60797
Bug ID: 60797
Summary: gcc hangs with error: only weak aliases are supported
in this configuration
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: junchao.zhang at gmail dot com
On my Mac OS X 10.9.2, when I use gcc to compile this program, test.c,
#include <stdio.h>
extern int foo __attribute__((alias("bar")));
int main()
{
return 0;
}
gcc hangs with countless
test.c:3:12: error: only weak aliases are supported in this configuration
test.c:3:12: error: only weak aliases are supported in this configuration
test.c:3:12: error: only weak aliases are supported in this configuration
...
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c/60797] gcc hangs with error: only weak aliases are supported in this configuration
2014-04-09 19:31 [Bug c/60797] New: gcc hangs with error: only weak aliases are supported in this configuration junchao.zhang at gmail dot com
@ 2014-04-09 19:44 ` dominiq at lps dot ens.fr
2014-04-11 9:11 ` [Bug middle-end/60797] [4.9 Regression] " rguenth at gcc dot gnu.org
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: dominiq at lps dot ens.fr @ 2014-04-09 19:44 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60797
Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2014-04-09
Ever confirmed|0 |1
--- Comment #1 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
r206658 gives
pr60797.c:3:12: error: only weak aliases are supported in this configuration
extern int foo __attribute__((alias("bar")));
^
pr60797.c:3:12: error: only weak aliases are supported in this configuration
while r206880 gives the "infinite" errors.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug middle-end/60797] [4.9 Regression] gcc hangs with error: only weak aliases are supported in this configuration
2014-04-09 19:31 [Bug c/60797] New: gcc hangs with error: only weak aliases are supported in this configuration junchao.zhang at gmail dot com
2014-04-09 19:44 ` [Bug c/60797] " dominiq at lps dot ens.fr
@ 2014-04-11 9:11 ` rguenth at gcc dot gnu.org
2014-04-11 9:25 ` rguenth at gcc dot gnu.org
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: rguenth at gcc dot gnu.org @ 2014-04-11 9:11 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60797
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |x86_64-*-darwin
CC| |hubicka at gcc dot gnu.org
Target Milestone|--- |4.9.0
Summary|gcc hangs with error: only |[4.9 Regression] gcc hangs
|weak aliases are supported |with error: only weak
|in this configuration |aliases are supported in
| |this configuration
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug middle-end/60797] [4.9 Regression] gcc hangs with error: only weak aliases are supported in this configuration
2014-04-09 19:31 [Bug c/60797] New: gcc hangs with error: only weak aliases are supported in this configuration junchao.zhang at gmail dot com
2014-04-09 19:44 ` [Bug c/60797] " dominiq at lps dot ens.fr
2014-04-11 9:11 ` [Bug middle-end/60797] [4.9 Regression] " rguenth at gcc dot gnu.org
@ 2014-04-11 9:25 ` rguenth at gcc dot gnu.org
2014-04-11 9:30 ` rguenth at gcc dot gnu.org
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: rguenth at gcc dot gnu.org @ 2014-04-11 9:25 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60797
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
0x0000000000615b12 in c_write_global_declarations_1 (
globals=<type_decl 0x7ffff6c4d170 int>)
at /space/rguenther/src/svn/trunk/gcc/c/c-decl.c:10276
10272 do
10273 {
10274 reconsider = false;
10275 for (decl = globals; decl; decl = DECL_CHAIN (decl))
10276 reconsider |= wrapup_global_declaration_2 (decl);
10277 }
10278 while (reconsider);
which basically endlessly loops because nothing sets TREE_ASM_WRITTEN on
the alias.
Index: gcc/varasm.c
===================================================================
--- gcc/varasm.c (revision 209292)
+++ gcc/varasm.c (working copy)
@@ -5675,6 +5675,7 @@ assemble_alias (tree decl, tree target)
else
error_at (DECL_SOURCE_LOCATION (decl),
"only weak aliases are supported in this configuration");
+ TREE_ASM_WRITTEN (decl) = 1;
return;
}
# endif
fixes it. Probably also needed above for targets without any alias support.
I wonder why "weakref" errors just fall through and don't return though.
Index: gcc/varasm.c
===================================================================
--- gcc/varasm.c (revision 209292)
+++ gcc/varasm.c (working copy)
@@ -5665,6 +5665,7 @@ assemble_alias (tree decl, tree target)
# if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
error_at (DECL_SOURCE_LOCATION (decl),
"alias definitions not supported in this configuration");
+ TREE_ASM_WRITTEN (decl) = 1;
return;
# else
if (!DECL_WEAK (decl))
@@ -5675,6 +5676,7 @@ assemble_alias (tree decl, tree target)
else
error_at (DECL_SOURCE_LOCATION (decl),
"only weak aliases are supported in this configuration");
+ TREE_ASM_WRITTEN (decl) = 1;
return;
}
# endif
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug middle-end/60797] [4.9 Regression] gcc hangs with error: only weak aliases are supported in this configuration
2014-04-09 19:31 [Bug c/60797] New: gcc hangs with error: only weak aliases are supported in this configuration junchao.zhang at gmail dot com
` (2 preceding siblings ...)
2014-04-11 9:25 ` rguenth at gcc dot gnu.org
@ 2014-04-11 9:30 ` rguenth at gcc dot gnu.org
2014-04-11 11:46 ` rguenth at gcc dot gnu.org
2014-04-11 11:46 ` rguenth at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: rguenth at gcc dot gnu.org @ 2014-04-11 9:30 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60797
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Testcase:
/* { dg-do compile } */
/* { dg-skip-if "" { alias } } */
extern int foo __attribute__((alias("bar"))); /* { dg-error "supported" } */
int main()
{
return 0;
}
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug middle-end/60797] [4.9 Regression] gcc hangs with error: only weak aliases are supported in this configuration
2014-04-09 19:31 [Bug c/60797] New: gcc hangs with error: only weak aliases are supported in this configuration junchao.zhang at gmail dot com
` (3 preceding siblings ...)
2014-04-11 9:30 ` rguenth at gcc dot gnu.org
@ 2014-04-11 11:46 ` rguenth at gcc dot gnu.org
2014-04-11 11:46 ` rguenth at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: rguenth at gcc dot gnu.org @ 2014-04-11 11:46 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60797
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug middle-end/60797] [4.9 Regression] gcc hangs with error: only weak aliases are supported in this configuration
2014-04-09 19:31 [Bug c/60797] New: gcc hangs with error: only weak aliases are supported in this configuration junchao.zhang at gmail dot com
` (4 preceding siblings ...)
2014-04-11 11:46 ` rguenth at gcc dot gnu.org
@ 2014-04-11 11:46 ` rguenth at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: rguenth at gcc dot gnu.org @ 2014-04-11 11:46 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60797
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Fri Apr 11 11:45:44 2014
New Revision: 209299
URL: http://gcc.gnu.org/viewcvs?rev=209299&root=gcc&view=rev
Log:
2014-04-11 Richard Biener <rguenther@suse.de>
PR middle-end/60797
* varasm.c (assemble_alias): Avoid endless error reporting
recursion by setting TREE_ASM_WRITTEN.
* gcc.dg/pr60797.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/pr60797.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/varasm.c
^ permalink raw reply [flat|nested] 7+ messages in thread
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2014-04-09 19:31 [Bug c/60797] New: gcc hangs with error: only weak aliases are supported in this configuration junchao.zhang at gmail dot com
2014-04-09 19:44 ` [Bug c/60797] " dominiq at lps dot ens.fr
2014-04-11 9:11 ` [Bug middle-end/60797] [4.9 Regression] " rguenth at gcc dot gnu.org
2014-04-11 9:25 ` rguenth at gcc dot gnu.org
2014-04-11 9:30 ` rguenth at gcc dot gnu.org
2014-04-11 11:46 ` rguenth at gcc dot gnu.org
2014-04-11 11:46 ` rguenth at gcc dot gnu.org
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