[Bug 58381] New: "musl: Use __builtin_rint if available" breaks clang builds (except aarch64)

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=58381

Bug ID: 58381
           Summary: "musl: Use __builtin_rint if available" breaks clang
                    builds (except aarch64)
           Product: Wine
           Version: 9.10
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: msvcrt
          Assignee: [e-mail]
          Reporter: [e-mail]
                CC: [e-mail]
   Regression SHA1: ee6e83dca874491329c5b376c2f9563093e3c69f
      Distribution: ---

Since "musl: Use __builtin_rint if available",
ee6e83dca874491329c5b376c2f9563093e3c69f, any calls to rint end up in infinite
loops, when built with Clang (except on aarch64).

If Clang doesn't have any good implementation of "__builtin_rint", it generates
a function call to "rint", even if built with -fno-builtin. See
https://gcc.godbolt.org/z/aYb3c1Ks1 for examples of the generated code. Only on
aarch64, Clang generates an inline implementation.