gcc@5 gcc@6 [email protected]: deprecate

[cho-m]

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• Have you ensured that your commits follow the commit style guide?
• Have you checked that there aren't other open pull requests for the same formula update/change?
• Have you built your formula locally with brew install --build-from-source <formula>, where <formula> is the name of the formula you're submitting?
• Is your test running fine brew test <formula>, where <formula> is the name of the formula you're submitting?
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Need confirmation if safe to deprecate gcc@5 now, which is needed to re-deprecate [email protected] (related to #106902).

Also considering deprecating gcc@6 to reduce number of GCC formulae to get closer to our versioning requirement. GCC 6 seems to be least used of not-yet-deprecated but officially unsupported/unmaintained GCC versions (GCC 9 and older are no longer supported -- https://gcc.gnu.org/gcc-9/)

GCC formulae does still exceed our max of 5 versions by 1 (i.e. 7, 8, 9, 10, 11, unversioned/12).

[Bo98]

It might be worth seeing the gcc@5 install count go down first.

In the meantime, it may be worth considering what we should continue to support as a compiler in brew: https://github.com/Homebrew/brew/blob/24153391249a51b3de14a2b92f8d84707f538882/Library/Homebrew/compilers.rb#L6

[danielnachun]

GCC formulae does still exceed our max of 5 versions by 1 (i.e. 7, 8, 9, 10, 11, unversioned/12).

GCC 7 will not build on Ubuntu 22.04 without patching, so we should also deprecate it. Conveniently, that would get us down to only 5 versions.

[carlocab]

Linux installs for gcc@5 in the past 30 days are only 3% of installs in the past year, so installs are already on the way down. Let's help that along with a deprecation.

We can postpone disabling if there are still too many installs.

[BrewTestBot]

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