Check our functions against `musl-math-sys`. This is similar to the
existing musl tests that go through binary serialization, but works on
more platforms.
Sometimes we want to be able to xfail specific inputs without changing
the checked ULP for all cases or skipping the tests. There are also some
cases where we need to perform extra checks for only specific functions.
Add a trait that provides a hook for providing extra checks or skipping
existing checks on a per-function or per-input basis.
Create a new test that checks `for_each_fn` against `ALL_FUNCTIONS`,
i.e. the manually entered function list against the automatically
collected list. If any are missing (e.g. new symbol added), then this
will produce an error.
Use a build script for `libm-test` to enumerate all symbols provided by
`libm` and provide this list in a variable. This will allow us to make
sure no functions are missed anytime they must be manually listed.
Additionally, introduce some helper config options.
We will have more test features in the near future, and it would be nice
for them all to have a common `test-` prefix. Reverse the existing
feature so this is the case.
There isn't any reason for this feature to be exposed or part of the
build script. Move it to a separate crate.
We will also want more tests that require some support functions; this
will create a place for them.
