On Fri, 29 Jan 2010, Carlos O'Donell wrote:
> On Wed, Jan 27, 2010 at 12:06 PM, John David Anglin
> > The original code:
> >
> > 258: 2b 60 00 00 addil L%0,dp,r1
> > 25c: 34 23 00 00 ldo 0(r1),r3
> > 260: 0c 60 10 82 ldw 0(r3),rp
> >
> > __nptl_nthreads is undefined weak:
> >
> > w __nptl_nthreads
>
> The symbol is defined in libpthread.so, specifically by
> nptl/pthread_create.c "unsigned int __nptl_nthreads = 1;"
>
> Application link map shows:
> .data 0x000a1648 0x14
> /usr/lib/gcc/hppa-linux-gnu/4.3.4/../../../libpthread.a(pthread_create.o)
> 0x000a1648 __nptl_nthreads
>
> I don't see any segmentation fault, nor do I see an undefined weak
> __nptl_nthreads:
Think you missed that I said the application was being linked with
-static. As a result, pthread_create.o won't be loaded from libpthread.a
just to resolve __nptl_nthreads.
This is the application:
// This test only applies to glibc (NPTL) targets.
// { dg-do run { target *-*-linux* } }
// { dg-options "-pthread" }
#include <pthread.h>
#include <cxxabi.h>
extern "C" int printf (const char *, ...);
int main()
{
try
{
pthread_exit (0);
}
catch (abi::__forced_unwind &)
{
printf ("caught forced unwind\n");
throw;
}
catch (...)
{
printf ("caught ...\n");
return 1;
}
}
This is the gcc link command:
/home/dave/gnu/gcc/objdir/gcc/testsuite/g++/../../collect-ld -static -o ./forced.xgs /usr/lib/crt1.o /usr/lib/crti.o /home/dave/gnu/gcc/objdir/gcc/testsuite/g++/../../crtbeginT.o -L/home/dave/gnu/gcc/objdir/hppa-linux/./libstdc++-v3/src/.libs -L/home/dave/gnu/gcc/objdir/hppa-linux/./libstdc++-v3/src/.libs -L/home/dave/gnu/gcc/objdir/hppa-linux/./libiberty -L/home/dave/gnu/gcc/objdir/gcc/testsuite/g++/../.. -L/home/dave/gnu/gcc/objdir/hppa-linux/./libstdc++-v3/src/.libs /tmp/ccmLwpAe.o -lstdc++ -lm --start-group -lgcc -lgcc_eh -lpthread -lc --end-group /home/dave/gnu/gcc/objdir/gcc/testsuite/g++/../../crtend.o /usr/lib/crtn.o
Compile with:
g++ -o xx -static -pthread xx.C
Given what you said, the same fault would likely occur on x86.
Dave
--
J. David Anglin dave.anglin@xxxxxxxxxxxxxx
National Research Council of Canada (613) 990-0752 (FAX: 952-6602)
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