Messages in this thread | | | Date | Mon, 17 Oct 2022 14:23:34 +0200 | Subject | Re: [PATCH] gcov: support GCC 12.1 and newer compilers | From | Martin Liška <> |
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On 10/17/22 13:38, David Laight wrote: > From: Andrew Morton >> Sent: 17 October 2022 01:41 > .. >> 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". >> >> So I'll add a cc:stable to this, so that people can use new gcc >> versions to build older kernels. > > I can't help wondering what happens if you link a binary > compiled with an old gcc with one build with a new gcc?
It should be fine as the code emits each .gcda file with version that comes from the compilation phase:
pos += store_gcov_u32(buffer, pos, info->version);
> > This could easily happen with out of tree loadable modules.
Sure.
> Or just linking an old .a file into a userspace binary. > > Now maybe the gcov data isn't used (I've not looked up what > it is for) but is sounds like something whose format should > be set in stone?
No, I've doing some changes to the format based on new challenges we face.
Cheers, Martin
> > David > > - > Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK > Registration No: 1397386 (Wales)
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