Messages in this thread | | | Date | Mon, 17 Oct 2022 10:02:53 +0200 | Subject | Re: [PATCH] gcov: support GCC 12.1 and newer compilers | From | Martin Liška <> |
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On 10/17/22 02:40, Andrew Morton wrote: > On Fri, 14 Oct 2022 11:30:51 +0200 Peter Oberparleiter <oberpar@linux.ibm.com> wrote: > >> On 13.10.2022 09:40, Martin Liška wrote: >>> Starting with GCC 12.1, there are 2 significant changes to the .gcda >>> file format that needs to be supported: >>> >>> a) [gcov: Use system IO buffering] (23eb66d1d46a34cb28c4acbdf8a1deb80a7c5a05) changed >>> that all sizes in the format are in bytes and not in words (4B) >>> b) [gcov: make profile merging smarter] (72e0c742bd01f8e7e6dcca64042b9ad7e75979de) >>> add a new checksum to the file header. >>> >>> Tested with GCC 7.5, 10.4, 12.2 and the current master. >>> >>> Signed-off-by: Martin Liska <mliska@suse.cz> >> >> Looks good, thanks! I successfully tested this patch on s390 using GCC >> 12.2 and 11.2. >> >> Tested-by: Peter Oberparleiter <oberpar@linux.ibm.com> >> Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com> >> >> Andrew, could you add this patch via your tree? > > Sure. > > The changelog doesn't tell us what the user-visible effects of this are > (please, it should do so), but it sounds to me like those effects are > "gcov is utterly busted".
Hi.
Sorry for the missing user-visible effect. You are correct, the created .gcda format can't be read by gcov tool since GCC 12.1 release.
Thanks, Martin
> > So I'll add a cc:stable to this, so that people can use new gcc > versions to build older kernels.
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