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c/6897: Code produced with -fPIC reserves EBX, but compiles bad __asm__ anyway
- From: Matthias Klose <doko at klose dot in-berlin dot de>
- To: gcc-gnats at gcc dot gnu dot org, debian-gcc at lists dot debian dot org
- Date: Sat, 01 Jun 2002 22:09:40 +0200
- Subject: c/6897: Code produced with -fPIC reserves EBX, but compiles bad __asm__ anyway
- Reply-to: 73065 at bugs dot debian dot org
>Number: 6897
>Category: c
>Synopsis: Code produced with -fPIC reserves EBX, but compiles bad __asm__ anyway
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: unassigned
>State: open
>Class: accepts-illegal
>Submitter-Id: net
>Arrival-Date: Sat Jun 01 13:16:00 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: camm@enhanced.com
>Release: 3.1 (Debian) (Debian unstable)
>Organization:
The Debian Project
>Environment:
System: Debian GNU/Linux (unstable)
Architecture: i686
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Installed/Config-files/Unpacked/Failed-config/Half-installed
|/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad)
||/ Name Version Description
+++-==============-==============-============================================
ii gcc-3.1 3.1-2 The GNU C compiler.
ii g++-3.1 3.1-2 The GNU C++ compiler.
ii libstdc++4 3.1-2 The GNU stdc++ library version 3
ii libstdc++4-dev 3.1-2 The GNU stdc++ library version 3 (developmen
ii binutils 2.12.90.0.7-1 The GNU assembler, linker and binary utiliti
ii libc6 2.2.5-6 GNU C Library: Shared libraries and Timezone
host: i386-linux
configured with: /mnt/data/gcc-3.1/gcc-3.1-3.1ds2/src/configure -v --enable-languages=c,c++,java,f77,proto,objc,ada --prefix=/usr --mandir=$\(prefix\)/share/man --infodir=$\(prefix\)/share/info --with-gxx-include-dir=$\(prefix\)/include/g++-v3-3.1 --enable-shared --with-system-zlib --enable-long-long --enable-nls --without-included-gettext --enable-clocale=gnu --enable-threads=posix --enable-java-gc=boehm --enable-objc-gc i386-linux
>Description:
[ Reported to the Debian BTS as report #73065.
Please CC 73065@bugs.debian.org on replies.
Log of report can be found at http://bugs.debian.org/73065 ]
According to the bug submitter, both files should fail to compile with
the same warning. He has produced verifiably incorrect asm code using
the latter syntax. Rechecked with gcc-3.1.
intech20:/tmp$ cat foo.c
int
main(int argc,char * argv[]) {
int i=0;
__asm__ __volatile__ ("addl $1,%%ebx\n\t" : : "b" (i));
}
intech20:/tmp$ cc -fPIC foo.c -o foo
foo.c: In function `main':
foo.c:6: Invalid `asm' statement:
foo.c:6: fixed or forbidden register 3 (bx) was spilled for class BREG.
intech20:/tmp$ cat foo1.c
int
main(int argc,char * argv[]) {
int i=0;
__asm__ __volatile__ ("addl $1,%%ebx\n\t" : : "a" (i) : "ebx");
}
intech20:/tmp$ cc -fPIC foo1.c -o foo
intech20:/tmp$
>How-To-Repeat:
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted: