osrm-backend: exclude libraries on Linux due to GCC dependency

[cho-m]

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• Is your test running fine brew test <formula>, where <formula> is the name of the formula you're submitting?
• Does your build pass brew audit --strict <formula> (after doing HOMEBREW_NO_INSTALL_FROM_API=1 brew install --build-from-source <formula>)? If this is a new formula, does it pass brew audit --new <formula>?

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Another unwanted runtime dependency on versioned GCC. Trying out shipping only executables for bottles.

Also trying to drop some old deps and workarounds.

[MikeMcQuaid]

Want @carlocab or @Bo98 to 👍🏻 the GCC allowlist. Let's make the bottle and from-source formula behave the same.

[MikeMcQuaid]

Suggested change

	The bottle does not include C++ libraries as core formulae are
	not allowed to have a Linux-only GCC dependency for libraries.
	Does not include C++ libraries.

• I don't think people need to know the reason why
• I don't think it makes sense to make this bottle only

[MikeMcQuaid]

Suggested change

	# Remove C++ libraries from Linux bottle. Can consider restoring once GCC 12 is default
	rm_r([include, lib]) if OS.linux? && ENV["HOMEBREW_GITHUB_ACTIONS"]
	# Remove C++ libraries from Linux formula. Can consider restoring once GCC 12 is default
	rm_r([include, lib]) if OS.linux?

[MikeMcQuaid]

Suggested change

	refute_path_exists lib if OS.linux? && ENV["HOMEBREW_GITHUB_ACTIONS"]
	refute_path_exists lib if OS.linux?

[carlocab]

Yea, as long as you're not shipping libraries it's fine. We should probably audit for that.

Something like a check that makes sure all ELF files in the keg are executable if a formula is in linux_only_gcc_dependency_allowlist. That can be relaxed if we can actually check the GCC version required by a library.

[MikeMcQuaid]

Yea, as long as you're not shipping libraries it's fine. We should probably audit for that.

Something like a check that makes sure all ELF files in the keg are executable if a formula is in linux_only_gcc_dependency_allowlist. That can be relaxed if we can actually check the GCC version required by a library.

Lots of great ideas here, thanks @carlocab ❤️

[cho-m]

Locally I'm scoping out alternative to just completing the GCC 12 upgrade. We already use GLIBCXX_3.4.30 (GCC 12.1.0) in some binaries perhaps from Ubuntu's different GCC vs libstdc++, e.g.

$ objdump -p $(brew --prefix)/lib/libz3.so | grep -oE 'GLIBCXX_3.4.[0-9]{2,}' | sort -r | head -3
GLIBCXX_3.4.30
GLIBCXX_3.4.29
GLIBCXX_3.4.26

EDIT: Homebrew/brew#20609

[cho-m]

Closing in favor of improving brew detection given GCC 12 is actually mandatory in many of our Linux bottles.