------- Comment #5 from seongbae dot park at gmail dot com 2006-07-23 17:27
-------
It seems that you didn't change libgcov.c,
which suggests that you didn't address __gcov_{pow2,interval}_profiler.
Without such change, -fprofile-generate will cause the mismatch between
the value counters and edge counters,
so it would be very nice if you can fix that as well
(this is just a suggestion).
In case someone wants to address that issue,
I think there are three choices:
#1 make above profiler routines to use atomic increment *always*
#2 introduce a new environment variable to pick atomic/non-atomic increment
#3 make atomic increment version of those routines and -fprofile-multithread to
generate codes to call them.
I prefer #3, but #1 might be simple enough without much bad affect.
Another comment is about the name of -fprofile-multithread.
There's an alternative MT-safe profiling scheme of making counters TLS.
So I'd prefer if the option for atomic increment is more explicit,
something like -fprofile-atomic-increment.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28441
