Starting with Xcode 12 Beta 2, builds that used to work on Apple Silicon
now break due to `Hardware#oldest_cpu` returning `:nehalem` [1].
This commit is the first in a series of improvements to
`Hardware#oldest_cpu`. It resolves the Xcode 12 Beta 2 issue for now.
[1]: https://github.com/Homebrew/brew/issues/7857#issuecomment-655536261
Darwin 20 adds the CPU family `CPUFAMILY_ARM_VORTEX_TEMPEST`
(aka ARMv8.3-A), which is assigned the identifier of `0x07d34b9f`.
This is relevant for `SystemConfig` in Homebrew.
See also:
https://en.wikipedia.org/wiki/Comparison_of_ARMv8-A_cores
Anywhere we can use `blob/master` we can use `blob/HEAD` instead. This
will make life easier if we ever rename our default branch in future
(once/if Git and GitHub provides the necessary tooling to do so).
We have strings containing hardcoded ".dylib" extensions in homebrew-core.
To be able to bring linuxbrew-core and homebrew-core closer together,
I am introducing a new generic attribute that can be used in formulae.
Companion to https://github.com/Homebrew/brew/pull/7698.
Provide better, `odeprecated` messaging for
`depends_on :macos => :mavericks` and otherwise just fix up the code
that relied on `:mavericks`.
- Depending on context, I've gone for either "denylist" or "disallow"
here. "Disallow" for things in sentences, or actions, and "denylist"
for list of things.
Remove usage where `Homebrew.args` could be used instead or, due to the
`Homebrew.args` parsing, there was dead code that was never executed
(and no-one complained about not working).
Refactor the CLI::Args module so it doesn't have different paths to
check arguments depending on whether the arguments have been parsed or
not. Instead, set the values we need from the global ARGV at
first, global initialisation time where they will be thrown away when
the actual arguments are parsed.
To do this some other general refactoring was needed:
- more methods made private when possible
- e.g. `HEAD?` used consistently instead of `head` before arguments
are parsed.
- formula options are only parsed after named arguments are extracted
