Re: [gcc-4.3.1][c++] weird segfault with -O3 in constructor of a global object

[Maik Beckmann <beckmann dot maik at googlemail dot com>]

Am Mittwoch 25 Juni 2008 19:09:13 schrieb Maik Beckmann:
> Hello,
>
> This code
> {{{
> struct vector {
>   vector() : x(0), y(0), z(0) { }
>   float x,y,z;
> };
>
> struct Foo {
>   int dummy; // commenting this out makes it run perfectly
>   vector array_of_vectors[4];
> };
>
> Foo foo;
>
> int main() { }
> }}}
> compiled with
>   g++ -O3 test.cpp -o test
> segaults on my x86-64 linux box.

I'm running arch-linux x86-64.

I compiled the vanilla gcc-4.3.1 sources
{{{
maik@localhost:~/workspace/tester/gcc43$ 
LC_ALL=C /var/abs/local/gcc/gcc-4.3.1/stage/bin/g++ -v
Using built-in specs.
Target: x86_64-unknown-linux-gnu
Configured 
with: ../configure --prefix=/var/abs/local/gcc/gcc-4.3.1/stage --enable-languages=c++ --disable-multilib --with-optimization=generic
Thread model: posix
gcc version 4.3.1 (GCC) 
}}}
which give me the same segfault as with the gcc from the arch-linux 
repositories:
{{{
maik@localhost:~$ LC_ALL=C g++ -v
Using built-in specs.
Target: x86_64-unknown-linux-gnu
Configured 
with: ../configure --prefix=/usr --enable-shared --enable-languages=c,c++,fortran,objc,obj-c++,treelang --enable-threads=posix --mandir=/usr/share/man --enable-__cxa_atexit --disable-multilib --libdir=/usr/lib --libexecdir=/usr/lib --enable-clocale=gnu --disable-libstdcxx-pch --with-tune=generic
Thread model: posix
gcc version 4.3.1 (GCC)
}}}

This thread at the arch-general list 
  http://thread.gmane.org/gmane.linux.arch.general/16677
shows that on x86-32 it works fine while on x86-64 the segfault happens.
  
All I wait for filing a bug report is someone out there saying that vanilla 
gcc-4.3.1 on his/her debian/ubuntu/redhat/fedora x86-64 (aka. amd64) box 
causes the same segfault with -O3 on the code I posted.


Best,
 -- Maik