[llvm-dev] GCC toolchain versioning policy? (D43779)

[Roman Lebedev via llvm-dev]

Hi.

As per[1], gcc-4.8 is the oldest supported *major* gcc version.
But what about minor/patch versions?

When https://reviews.llvm.org/D43779 was initially committed,
a few[2][3] buildbots failed. As i have now looked into the issue:
* but it is *REPRODUCIBLE* with gcc-4.8.4 and gcc-4.9.2 from debian
oldstable (Jessie).
* it is *NOT* reproducible with gcc-4.8.5 and gcc-4.9.3 from ubuntu 16.04,
So it looks like it was a gcc problem, and it is resolved in latest
minor/patch versions.

So is there some more specific guideline on minor/patch version requirements?
Do we want LLVM to be buildable with all gcc 4.8/4.9 versions?
Or is it okay to only build with the latest point versions, that
contain the fix?

(Regardless, it would be good to have the answer in [1])

Roman.

[1] http://llvm.org/docs/GettingStarted.html#host-c-toolchain-both-compiler-and-standard-library
[2] http://lab.llvm.org:8011/buildslaves/atom1-buildbot
[3] http://lab.llvm.org:8011/buildslaves/ps4-buildslave1a