[libc-commits] [libc] [libc] Properly clear out errno in tests that check its value. (PR #131650)

[Joseph Huber via libc-commits]

jhuber6 wrote:

> > Couldn't we just make the macros like `EXPECT_MATH_ERRNO` or `ASSERT_ERRNO` set it after finishing?
> 
> No, because we need to clear out errno before the first invocation of function-under-test, and hence before the first call to `ASSERT_ERRNO`.

And we can't do that in the test runner before we execute the unit test?

https://github.com/llvm/llvm-project/pull/131650