This is the mail archive of the mailing list for the GCC project.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: GCC 4.7.0 and C++ atomics

On 03/07/2012 10:11 AM, Sebastian Huber wrote:

I run the GCC testsuite for GCC 4.7.0 20120307

I got a lot of errors like this:

FAIL: g++.dg/simulate-thread/atomics-1.C -O0 -g (test for excess errors)
148796 Excess errors:
148797 /home/sh/rtems-testing/gcc/b-arm-gcc/arm-rtemseabi4.11/libstdc++-v3/include/bits/atomic_base.h:458: undefined reference to `__sync_synchronize'
148798 /home/sh/rtems-testing/gcc/b-arm-gcc/arm-rtemseabi4.11/libstdc++-v3/include/bits/atomic_base.h:458: undefined reference to `__sync_synchronize'
148799 /home/sh/rtems-testing/gcc/b-arm-gcc/arm-rtemseabi4.11/libstdc++-v3/include/bits/atomic_base.h:458: undefined reference to `__sync_synchronize'
148800 /home/sh/rtems-testing/gcc/b-arm-gcc/arm-rtemseabi4.11/libstdc++-v3/include/bits/atomic_base.h:458: undefined reference to `__sync_synchronize'
148801 /home/sh/rtems-testing/gcc/b-arm-gcc/arm-rtemseabi4.11/libstdc++-v3/include/bits/atomic_base.h:438: undefined reference to `__sync_synchronize'
148802 /tmp/ccgSyPe7.o:/home/sh/rtems-testing/gcc/b-arm-gcc/arm-rtemseabi4.11/libstdc++-v3/include/bits/atomic_base.h:438: more undefined references to `__sync_synchronize' follow

Who is supposed to provide this function? expand_mem_thread_fence

Looks like it is defaulting to emitting the synchronize_libfunc call, which is suppose to be provided by libgcc I think...

rth, you are familiar with how this part is suppose to hook up properly...

I traced the code in expand_mem_thread_fence, and the sync_synchronize is being emiited by:

else if (synchronize_libfunc != NULL_RTX)
        emit_library_call (synchronize_libfunc, LCT_NORMAL, VOIDmode, 0);

presumably something just isn't being linked to the executable? or maybe not being built into libgcc?


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]