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Mainline miscompiles tramp3d-v3 testcase at -O0
- From: Richard Guenther <rguenth at tat dot physik dot uni-tuebingen dot de>
- To: "gcc at gcc dot gnu dot org" <gcc at gcc dot gnu dot org>
- Date: Mon, 06 Sep 2004 23:39:55 +0200
- Subject: Mainline miscompiles tramp3d-v3 testcase at -O0
The tramp3d-v3.cpp testcase
(http://www.tat.physik.uni-tuebingen.de/~rguenth/gcc/tramp3d-v3.cpp.gz)
is miscompiled at -O0 and up. Symptom is the binary segfaulting at
startup with commandline "-n 10".
Failure happens on ia32 with g++-3.5 (GCC) 3.5.0 20040906 (experimental)
but not with g++ (GCC) 3.5.0 20040827 (experimental).
(gdb) run -n 10
Starting program: /tmp/tramp3d-v3 -n 10
Program received signal SIGSEGV, Segmentation fault.
0x0000000c in ?? ()
(gdb) bt
#0 0x0000000c in ?? ()
#1 0x0805611b in Inform& operator<< <int>(Inform&, int const&)
(o=@0xbfffe4dc,
val=@0x8228180) at tramp3d-v3.cpp:382
#2 0x08051f27 in main (argc=3, argv=0xbffff924) at tramp3d-v3.cpp:56567
#3 0x0817fb85 in __libc_start_main ()
looks like stack-corruption.
Richard.