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debug/10002: gcc -g sometimes places labels beyond the end of the function
- From: werner at almesberger dot net
- To: gcc-gnats at gcc dot gnu dot org
- Date: Sat, 8 Mar 2003 11:21:25 -0300
- Subject: debug/10002: gcc -g sometimes places labels beyond the end of the function
>Number: 10002
>Category: debug
>Synopsis: gcc -g sometimes places labels beyond the end of the function
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Sat Mar 08 14:26:01 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator: Werner Almesberger
>Release: 3.3 20030303 (prerelease)
>Organization:
>Environment:
System: Linux ar 2.4.18 #5 Mon Mar 18 09:25:24 ART 2002 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/gcc20030303/ --enable-languages=c
>Description:
gcc -g sometimes places labels beyond the end of the function,
so a breakpoint at such a label is never taken. This seems to happen
consistently if the function is void.
>How-To-Repeat:
Example (with Red Hat's gcc 3.1 20011127 on ia32):
$ cat <<EOF >foo.c
void main(void)
{
label:
return;
}
EOF
$ gcc -w -g foo.c
$ readelf -w a.out
...
DW_AT_name : (indirect string, offset: 0x50): label
...
DW_AT_low_pc : 0x80483aa 134513578
...
$ objdump -d a.out
...
08048398 <main>:
...
80483a8: c9 leave
80483a9: c3 ret
80483aa: 89 f6 mov %esi,%esi
...
>Fix:
My very ugly work-around is to add an asm("") after the label.
>Release-Note:
>Audit-Trail:
>Unformatted: