Re: [PATCH] CI: select CC based on CC_PACKAGE (again)

> Fix a regression in 707d2f2fe86 (CI: use "$runs_on_pool", not
> "$jobname" to select packages & config, 2021-11-23).
> 
> In that commit I changed CC=gcc from CC=gcc-9, but on OSX the "gcc" in
> $PATH points to clang, we need to use gcc-9 instead. Likewise for the
> linux-gcc job CC=gcc-8 was changed to the implicit CC=gcc, which would
> select GCC 9.4.0 instead of GCC 8.4.0.
> 
> Furthermore in 25715419bf4 (CI: don't run "make test" twice in one
> job, 2021-11-23) when the "linux-TEST-vars" job was split off from
> "linux-gcc" the "cc_package: gcc-8" line was copied along with
> it.
> 
> That wasn't a bug per-se, as that "make test" would have run under GCC
> 8 before the split into two jobs, but the point of selecting different
> compiler for these jobs is to get better coverage, and to narrow down
> any issues with a given compiler to the job that runs it. Since the
> "linux-TEST-vars" job is already special in other ways (in running
> with various GIT_TEST_* variables), and we've got the "linux-gcc" job
> covering gcc-8 let's have it used the default system compiler instead.
> 
> Reported-by: Carlo Arenas <carenas@gmail.com>
> Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
> ---
> Range-diff:
> 1:  94abb826627 < -:  ----------- CI: have osx-gcc use gcc, not clang
> -:  ----------- > 1:  d89ad4d5b7c CI: select CC based on CC_PACKAGE (again)
> 
> The range-diff is against a relevant patch in v4 of a larger CI series
> of mine[1]. This fix is independent of that, and on top of master. See
> [2] for the original fix and discussion.
> 
> As noted in the updated commit message not only the OSX jobs were
> affected, but also the linux-gcc job. This fixes both, along with a
> small fix to the related linux-TEST-vars recipe.
> 
> 1. https://lore.kernel.org/git/cover-v4-00.31-00000000000-20220418T132809Z-avarab@gmail.com/
> 2. https://lore.kernel.org/git/patch-v4-30.31-94abb826627-20220418T132809Z-avarab@gmail.com/
> 
>   .github/workflows/main.yml | 1 -
>   ci/lib.sh                  | 2 +-
>   2 files changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
> index c35200defb9..f12819a00d7 100644
> --- a/.github/workflows/main.yml
> +++ b/.github/workflows/main.yml
> @@ -236,7 +236,6 @@ jobs:
>             - jobname: linux-TEST-vars
>               cc: gcc
>               os: ubuntu
> -            cc_package: gcc-8
>               pool: ubuntu-latest
>             - jobname: osx-clang
>               cc: clang
> diff --git a/ci/lib.sh b/ci/lib.sh
> index cbc2f8f1caa..44007dcf93b 100755
> --- a/ci/lib.sh
> +++ b/ci/lib.sh
> @@ -122,7 +122,7 @@ then
>   	test macos != "$CI_OS_NAME" || CI_OS_NAME=osx
>   	CI_REPO_SLUG="$GITHUB_REPOSITORY"
>   	CI_JOB_ID="$GITHUB_RUN_ID"
> -	CC="${CC:-gcc}"
> +	CC="${CC:-${CC_PACKAGE:-gcc}}"