Re: Can gcc-4.2 be used to measure coverage on SMP platforms?

["nimble dude" <nimble.dude@gmail.com>]

2nd try...
Would be grateful if somebody could confirm one way or the other.



On Thu, Aug 14, 2008 at 8:36 PM, nimble dude <nimble.dude@gmail.com> wrote:
> Hello,
>
>    I have a newbie question about gcov and SMP support in gcov.
>
>    I am trying to measure the coverage information of a
> multi-threaded application running on an SMP platform. I compiled the
> image with "-fprofile-arcs -ftest-coverage" and linked with -lgcov.
> All optimizations were turned off. When the coverage was observed,
> some of the counters were wrong. Sure enough, in the disassembly
> output, the incrementing of the gcov related variables was not atomic.
> Searching gcc manuals for further info on gcov did not yield any
> information. The documentation on SMP and gcov support is rather
> sparse.
>
> - Does gcc-4.2 support atomic_increment of the gcov related information?
> - If so, is there another option that needs to be specified along with "gcc"
> - Does gcc-4.3.1 support atomic_increment of gcov counters
> natively(i.e, without further flags)?
>
> I appreciate your help in advance. Please excuse if this is already
> mentioned in documentation.
>
> Thank you,
> Ram
>