Review Linux section of CI build matrix

[heplesser]

While working on #2762, I noticed some points in the CI build matrix for Linux, which may deserve attention:

We first set

nest-simulator/.github/workflows/nestbuildmatrix.yml

Lines 401 to 404 in 7d9150c

	env:
	CXX_FLAGS: "-pedantic -Wextra -Woverloaded-virtual -Wno-unknown-pragmas"
	NEST_VPATH: "build"
	NEST_RESULT: "result"

and then later change this to

nest-simulator/.github/workflows/nestbuildmatrix.yml

Line 540 in 7d9150c

export CXX_FLAGS="-pedantic -Wextra -Wno-unknown-pragmas -D_GLIBCXX_ASSERTIONS"

Shouldn't we set it in one place only?

Also, why do we have

nest-simulator/.github/workflows/nestbuildmatrix.yml

Lines 536 to 538 in 7d9150c

	if [ "$xNEST_BUILD_COMPILER" = "CLANG" ]; then
	export CC=clang-11
	export CXX=clang++-11

where is NEST_BUILD_COMPILER set and why are we binding ourselves to clang-11, while the most recent version is 16.0?

Finally and unrelated, what is the purpose of this commented-out section (exists similarly for macOS):

nest-simulator/.github/workflows/nestbuildmatrix.yml

Line 206 in 7d9150c

# pytest-linux:

[github-actions]

Issue automatically marked stale!