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[Bug gcov-profile/58602] .gcno files not truncated at gcov_close


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58602

Jeffrey A. Law <law at redhat dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |law at redhat dot com

--- Comment #7 from Jeffrey A. Law <law at redhat dot com> ---
It seems like all we've done in the last 10 years is rotate through a set of
bugs in this code.

The whole point of the Richard's original removal of ftruncate was to make
things easier for folks on windows & using simulators (newlib).   That patch
introduced a race  which led to Jakub's change form Feb 2004 to close the race
condition, but which can leave the file untruncated.

So the question is does this introduce a race similar to what Jakub was trying
to fix back in Feb 2004?  What testing has been done to see if there's a race. 
Testing similar to Jakub's but scaled up for modern hardware would raise the
confidence level of this patch significantly.

http://marc.info/?l=gcc-patches&m=107747608611324&w=2

[ Oddly enough, the gcc.gnu.org archives seem to be missing for this thread and
much of Feb2004. ]


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