Collect common options used in artifact build tests in a single
mozconfig so they can be set more consistently.
Use this to make unsetting toolchain defines universal in these
tasks, fixing fallout from bug 1283898 which defined CARGO and
RUSTC everywhere, conflicting with --disable-compiler-environment
just like CC and CXX were conflicts in some artifact tasks.
MozReview-Commit-ID: 4SbxByjClQb
--HG--
extra : rebase_source : d8a48fd2192ceb5ece76c827e2243ae784b991cb
The --disable-compile-environment configure option used by
the artifact builds removes all support for toolchains,
including setting paths for them with environment options.
Unset the RUSTC and CARGO vars inherited from mozconfig.rust
in the artifact mozconfigs to accommodate the invalid option
check, just like we do for the CC and CXX options.
MozReview-Commit-ID: IwPetRaIY25
--HG--
extra : rebase_source : 37fb4bf9e69d3082cc0ed6b0013e6363a7e8e8e5
Upload symbols when --enable-artifact-build-symbols is specified.
Add --enable-artifact-build-symbols to artifact config for linux, linux64,
win32, win64, macosx64.
MozReview-Commit-ID: LpuwfzWXPBH
--HG--
extra : rebase_source : 137466aa3c8c327cf1932e012927fceb451d82ab
At the same time, we improve things slightly by deriving HOST_CC from CC
in a smarter way, as well as CXX from CC, which we weren't doing
previously.
Many related things are not moved at the same time to keep the patch
somehow "small".
