Homebrew gcc is now 8.

It generates errors if not compiling with gcc-8.
4 jobs from gcc-8 in 43 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
failed #8453
build

00:00:43

failed #8450
build

00:00:19

 
  Test
skipped #8452
allowed to fail
code_quality
skipped #8451
test
 
Name Stage Failure
failed
build Build
Checking out f971418b as gcc-8...
Skipping Git submodules setup
$ # Auto DevOps variables and functions # collapsed multi-line command
$ setup_docker
$ build
Logging to GitLab Container Registry with CI credentials...
WARNING! Using --password via the CLI is insecure. Use --password-stdin.
Get https://registry-1.docker.io/v2/: unauthorized: incorrect username or password
ERROR: Job failed: exit code 1