[Bug gcov-profile/112717] .gcda profiles compatibility guarantees between GCC versions

[zamazan4ik at tut dot by]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112717

--- Comment #3 from Alexander Zaitsev <zamazan4ik at tut dot by> ---
> I thought this was documented but I don't see. There is no guarantee for forward or backwards compatibility at all. In fact iirc there is a version stored in the files to make sure the correct version is used with the version of tools/compiler.

Could we add this information to the documentation? Would be really helpful to
the users to know this detail.

Since your answer am I right that right now it's a strong
recommendation/requirement to regenerate PGO profiles with each GCC update?