Date: Tue, 15 Apr 2008 17:20:05 +0900 From: gnn@freebsd.org To: stable@freebsd.org Subject: A bug in g++ exceptions on 7? Message-ID: <m21w57wmve.wl%gnn@neville-neil.com>
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Howdy,
We believe we've found a bug in the libgcc or libstdc++ library (not
sure which one) packaged with the gcc43 port in fbsd7 on an Intel
x86-64. A program linked against those libraries aborts when an
exception is thrown. It does not abort if -lpthread is added to the
link line, even though the program does not use threads. I believe
the problem is related to the pthread stubs in libgcc, but I don't
know enough to find the exact problem or fix it. An example is below.
My system:
>uname -a
FreeBSD testlab5 7.0-STABLE FreeBSD 7.0-STABLE #1: Thu Feb 28 10:06:47 EST 2008
root@builder:/usr/obj/usr/sources/FreeBSD.7/src/sys/GENERIC amd64
>which g++43
/usr/local/bin/g++43
>g++43 --version
g++43 (GCC) 4.3.1 20080313 (prerelease)
etc.
>echo $LD_LIBRARY_PATH
/usr/local/lib/gcc-4.3.1
Sample program.
When compiled with "g++43 test.cc" , it aborts upon the throw.
When compiled with "g++43 test.cc -lpthread", it runs correctly.
#include <stdio.h>
int main(int argc, char* argv[])
{
try {
throw 1;
}
catch (...) {
printf("Caught exception\n");
}
}
Again, it only aborts when omitting -lpthread AND using the dynamic
libs in /usr/local/lib/gcc-4.3.1. If we unsetenv LD_LIBRARY_PATH,
libraries are loaded from the base fbsd7 installation in /usr/lib,
which works.
Thoughts?
BTW We don't have a compiler issues mailing list I notice.
Later,
George
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