http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58602
--- Comment #4 from Laurent Aflonsi <laurent.alfonsi at st dot com> ---
When the .gcno graph file is opened for generating the coverage graph
information, the mode used is w+ as this code is shared with updating tools
such as libgcov. Thus, when GCC outputs .gcno files, it may leave garbage at
the end of the file if the file already exists when opening it.
This has been trackeddown from a kernel issue on lcov:
http://sourceforge.net/p/ltp/mailman/message/31141937/
This patch fixes the function gcov_open() such that the .gcno file is opened
with truncation when gcc asks for creating a new file (mode<0).
which I also proposed on the mailing list some time ago, but i got no
feedbacks.
http://gcc.gnu.org/ml/gcc-patches/2013-10/msg00254.html
Here is a Changelog:
2013-10-03 Laurent Alfonsi <laurent.alfo...@st.com>
PR gcov-profile/58602
* gcc/gcov-io.c (gcov_open): Open with truncation when mode<0
Regards,
Laurent
