[Bug gcov-profile/43825] New: gcov is initialized wrong on x86_64

[tglek at mozilla dot com]

Building Mozilla with pgo results in a binary that can't even start to generate
profiling data. Turns out that even CXX="g++ --coverage" and CC="gcc
--coverage" resulting a binary that segfaults on start.

The crash looks like 
 #0  0x00007ffff40807c1 in strlen () from /lib/libc.so.6
#1  0x00007ffff6823a92 in __gcov_init () from /tmp/xulrunner/dist/bin/libxul.so
#2  0x00007ffff6824f56 in __do_global_ctors_aux () from
/tmp/xulrunner/dist/bin/libxul.so
#3  0x00007ffff51888ab in _init () from /tmp/xulrunner/dist/bin/libxul.so
#4  0x00007fffffffe908 in ?? ()
#5  0x00007ffff7dee429 in ?? () from /lib64/ld-linux-x86-64.so.2
#6  0x00007ffff7dee5af in ?? () from /lib64/ld-linux-x86-64.so.2
#7  0x00007ffff7de1b2a in ?? () from /lib64/ld-linux-x86-64.so.2
#8  0x0000000000000001 in ?? ()
#9  0x00007fffffffeb8c in ?? ()
#10 0x0000000000000000 in ?? ()

Looks like the info parameter passed to __gcov_init is buggered. This broken in
gcc 4.4-trunk, didn't test on prior releases.


-- 
           Summary: gcov is initialized wrong on x86_64
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: gcov-profile
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: tglek at mozilla dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43825