[libc-commits] [libc] [libc][arm] add more math.h entrypoints (PR #77839)

[Nick Desaulniers via libc-commits]

nickdesaulniers wrote:

Testing this on the buildbot itself, I observe the following error during cmake configuration. Any idea what I'm missing?
```
CMake Error at /llvm/ndesaulniers/llvm-project/libc/cmake/modules/LLVMLibCObjectRules.cmake:672 (add_library):
  Cannot find source file:

    dummy_srcs
Call Stack (most recent call first):
  /llvm/ndesaulniers/llvm-project/libc/cmake/modules/LLVMLibCObjectRules.cmake:802 (create_entrypoint_object)
  /llvm/ndesaulniers/llvm-project/libc/cmake/modules/LLVMLibCObjectRules.cmake:880 (expand_flags_for_entrypoint_object)
  /llvm/ndesaulniers/llvm-project/libc/src/math/CMakeLists.txt:48 (add_entrypoint_object)
  /llvm/ndesaulniers/llvm-project/libc/src/math/CMakeLists.txt:85 (add_math_entrypoint_object)


CMake Error: CMake can not determine linker language for target: libc.src.math.cos.__internal__
CMake Error: CMake can not determine linker language for target: libc.src.math.cos
CMake Error: CMake can not determine linker language for target: libc.src.math.sin.__internal__
CMake Error: CMake can not determine linker language for target: libc.src.math.sin
CMake Error: CMake can not determine linker language for target: libc.src.math.tan.__internal__
CMake Error: CMake can not determine linker language for target: libc.src.math.tan
...
```

https://github.com/llvm/llvm-project/pull/77839