[libc-commits] [libc] [libc][math] Add POSIX math constants to math.h header. (PR #149150)

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lntue wrote:

> lgtm. Eventually I want to get all the macros properly listed in `math.yaml` and for ones like these their values could easily be defined directly there. But we can do that as a later refactor.
> 
> It would be good to have at least nominal tests for these too. All the tests really need to do is verify the type of each expression, e.g.
> 
> ```
> static_cast(std::is_same_v<double, decltype(M_PI)>);
> ```
> 
> etc. I don't know if it's worthwhile doing value checks with e.g. comparing some trig function's value where the input constant is something trivial like 0,1,-1.

I added a unit test for M_PI in the test/include folder.

https://github.com/llvm/llvm-project/pull/149150