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* Re: c/3875: gcc 3.0 breaks Mercury
@ 2002-03-07 12:16 Fergus Henderson
0 siblings, 0 replies; 3+ messages in thread
From: Fergus Henderson @ 2002-03-07 12:16 UTC (permalink / raw)
To: nobody; +Cc: gcc-prs
The following reply was made to PR c/3875; it has been noted by GNATS.
From: Fergus Henderson <fjh@cs.mu.OZ.AU>
To: gcc-gnats@gcc.gnu.org, gcc-prs@gcc.gnu.org, fjh@cs.mu.OZ.AU,
gcc-bugs@gcc.gnu.org, nobody@gcc.gnu.org
Cc:
Subject: Re: c/3875: gcc 3.0 breaks Mercury
Date: Fri, 08 Mar 2002 07:11:22 +1100
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=3875
This bug seems to be fixed in the latest snapshot.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: c/3875: gcc 3.0 breaks Mercury
@ 2002-03-08 8:53 neil
0 siblings, 0 replies; 3+ messages in thread
From: neil @ 2002-03-08 8:53 UTC (permalink / raw)
To: fjh, gcc-bugs, gcc-prs, nobody
Synopsis: gcc 3.0 breaks Mercury
State-Changed-From-To: open->closed
State-Changed-By: neil
State-Changed-When: Fri Mar 8 08:53:37 2002
State-Changed-Why:
You reported it fixed, thanks!
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=3875
^ permalink raw reply [flat|nested] 3+ messages in thread
* c/3875: gcc 3.0 breaks Mercury
@ 2001-07-30 5:16 Fergus Henderson
0 siblings, 0 replies; 3+ messages in thread
From: Fergus Henderson @ 2001-07-30 5:16 UTC (permalink / raw)
To: gcc-gnats
>Number: 3875
>Category: c
>Synopsis: gcc 3.0 breaks Mercury
>Confidential: no
>Severity: critical
>Priority: medium
>Responsible: unassigned
>State: open
>Class: ice-on-legal-code
>Submitter-Id: net
>Arrival-Date: Mon Jul 30 05:16:00 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator: Fergus Henderson
>Release: 3.0
>Organization:
Comp Sci, University of Melbourne
>Environment:
System: Linux mars 2.2.18pre21-ide #1 Sat Nov 18 19:41:46 EST 2000 i686 unknown
Architecture: i686
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: ./configure --prefix=/usr/local/gcc-3.0
>Description:
gcc 3.0 gets a segmentation fault when compiling C files generated by
the Mercury compiler.
The problem seems to be related to taking the address of an unreachable label.
>How-To-Repeat:
Compile the following file with `gcc -O'.
extern void *dummy;
void foo (void) {
goto *&&label1;
label1:
dummy = &&label2;
return;
label2:
goto label2;
}
The result is a crash in cc1
bash$ gcc -O bug.c
bug.c: In function `foo':
bug.c:9: Internal error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL: http://www.gnu.org/software/gcc/bugs.html > for instructions.
The crash occurs in find_basic_blocks_1().
(gdb) list *$pc
0x8149da4 is in find_basic_blocks_1 (flow.c:873).
868 || GET_CODE (PATTERN (next)) ==
ADDR_DIFF_VEC))
869 ;
870 else if (GET_CODE (lab) == NOTE)
871 ;
872 else if (GET_CODE (NEXT_INSN (insn)) == JUMP_INSN
873 && find_reg_note (NEXT_INSN (insn), REG_LABEL,
lab))
874 ;
875 else
876 lvl = alloc_EXPR_LIST (0, XEXP (note, 0), lvl);
877 }
(gdb) p insn
$5 = 0x401675c0
(gdb) pr
(insn 15 27 0 (set (mem/f:SI (symbol_ref:SI ("dummy")) 0)
(label_ref:SI 19)) 35 {*movsi_1} (nil)
(insn_list:REG_LABEL 19 (nil)))
>Fix:
A work-around is to compile without optimization.
>Release-Note:
>Audit-Trail:
>Unformatted:
^ permalink raw reply [flat|nested] 3+ messages in thread
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2002-03-07 12:16 c/3875: gcc 3.0 breaks Mercury Fergus Henderson
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2002-03-08 8:53 neil
2001-07-30 5:16 Fergus Henderson
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