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c/9088: c code aborts with -ftrapv
- From: wefing at gmx dot de
- To: gcc-gnats at gcc dot gnu dot org
- Date: Sun, 29 Dec 2002 01:20:24 +0100
- Subject: c/9088: c code aborts with -ftrapv
- Reply-to: wefing at gmx dot de
>Number: 9088
>Category: c
>Synopsis: c code aborts with -ftrapv
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Sat Dec 28 16:26:00 PST 2002
>Closed-Date:
>Last-Modified:
>Originator: Stephan Wefing
>Release: 3.2
>Organization:
none
>Environment:
System: Linux kato 2.4.19-64GB-SMP #1 SMP Fri Sep 13 13:15:53 UTC 2002 i686 unknown
Architecture: i686
Linux-Distribution: SuSE Professional 8.1
host: i486-suse-linux-gnu
build: i486-suse-linux-gnu
target: i486-suse-linux-gnu
configured with: ../configure --enable-threads=posix --prefix=/usr --with-local-prefix=/usr/local --infodir=/usr/share/info --mandir=/usr/share/man --libdir=/usr/lib --enable-languages=c,c++,f77,objc,java,ada --enable-libgcj --with-gxx-include-dir=/usr/include/g++ --with-slibdir=/lib --with-system-zlib --enable-shared --enable-__cxa_atexit i486-suse-linux
>Description:
simple c code using pointer arithmetics aborts if compiled with -ftrapv.
may be related to PR 9097.
>How-To-Repeat:
kato wefing/tmp> cat prog.c
int main(void)
{
struct s
{
int i;
double x;
};
struct s a[2];
struct s *p=a+1;
int i=p-a;
return 0;
}
kato wefing/tmp> gcc -o prog prog.c
kato wefing/tmp> ./prog
kato wefing/tmp> gcc -ftrapv -o prog prog.c
kato wefing/tmp> ./prog
Abort (core dumped)
Exit 134
kato wefing/tmp> gcc -g -ftrapv -o prog prog.c
kato wefing/tmp> ./prog
Abort (core dumped)
Exit 134
kato wefing/tmp> gdb ./prog core
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This GDB was configured as "i586-suse-linux"...
Core was generated by `./prog'.
Program terminated with signal 6, Aborted.
Reading symbols from /lib/libc.so.6...done.
Loaded symbols for /lib/libc.so.6
Reading symbols from /lib/ld-linux.so.2...done.
Loaded symbols for /lib/ld-linux.so.2
#0 0x4004edf1 in kill () from /lib/libc.so.6
(gdb) w
#0 0x4004edf1 in kill () from /lib/libc.so.6
#1 0x4004ebd8 in raise () from /lib/libc.so.6
#2 0x400504d9 in abort () from /lib/libc.so.6
#3 0x08048452 in __mulvsi3 () at ../../gcc/libgcc2.c:144
#4 0x08048378 in main () at prog.c:11
#5 0x4003d4a2 in __libc_start_main () from /lib/libc.so.6
(gdb) f 4
#4 0x08048378 in main () at prog.c:11
11 int i=p-a;
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted: