1410217 - Consider building linux64-ccov with GCC 7

Status: RESOLVED DUPLICATE of bug 1596275

(Testing :: Code Coverage, enhancement)

Description

[Marco Castelluccio [:marco]]

GCC 7 contains several fixes to the gcov pass, so we should consider switching to it.

Comment 1

[Marco Castelluccio [:marco]]

What is the status of CI builds using GCC 7?

Comment 2

[Mike Hommey [:glandium]]

There is a gcc 7 toolchain as of bug 1445536, but several things fail when using it for the build.

Comment 3

[Mike Hommey [:glandium]]

Err, and I now realize I hadn't landed it.

Comment 4

[Marco Castelluccio [:marco]]

I've tested a build with GCC 7 and -static-libgcc -static-libstdc++. It seems the build got quite slower, causing a lot of tests (or test suites) to timeout.

Comment 5

[Marco Castelluccio [:marco]]

Attachment: Patch

For reference, this is the patch.

And here's the try run: https://treeherder.mozilla.org/#/jobs?repo=try&revision=4254ad7e94c1f16fb740ef7f0c29e1049e2925f1.

It looks like the runtime almost doubled for many test suites.

Comment 6

[Marco Castelluccio [:marco]]

We'll likely switch to Clang for building the ccov build in bug 1499663. We can reopen if it doesn't happen.

Comment 7

[Marco Castelluccio [:marco]]

We are doing this after all, but it's being tracked in bug 1596275.