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
