phuang wrote:

> We need a test to clang/test/Driver/ohos.c similar to linux-ld.c 
> clang_rt.crtbegin.o.
> 
> You can add UNSUPPORTED: system-windows to ohos.c so that we don't need 
> backslashes.

[ohos.c](https://github.com/llvm/llvm-project/blob/main/clang/test/Driver/ohos.c#L25
) already has many tests for it. This PR changes behavior of function 
[OHOS::getCompilerRT()](https://github.com/llvm/llvm-project/pull/120159/files#diff-763eb55ff16745f240d46c78f988f7a2010f61d2ae2550260b3dcd65dd9ba1c7L341).
 It will search extra folders for compiler rt builtin libraries. But in tests, 
OHOS::getCompilerRT()'s return value will not be changed, becasue those extra 
folders don't have those requested builtin files. It will just returns the 
default library file path.

https://github.com/llvm/llvm-project/pull/120159
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