Add MinGW-w64 CI workflow for stdlib and compiler specs #15124
Merged
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Resolves part of #6170.
The use of the build artifact is temporary; once Crystal is available from MSYS2's Pacman, we should be able to use that directly for the test job. (The build job needs to stay because we need that artifact to bootstrap the Pacman build first.)
The MSYS Git is only needed for
spec/compiler/crystal/tools/init_spec.cr
andspec/compiler/crystal/tools/doc/project_info_spec.cr
. Apparently some of the specs in those files fail if Git cannot be located at all.As a final touch, this PR also ensures build commands have their embedded newlines replaced with whitespace, just like for MSVC, otherwise tools like
ld.exe
might consider\n-lLLVM-18\n
on the command line a single argument and fail.