srhines added a comment. Would it be reasonable to have a test for this with perhaps an invalid GCC installation? There is some mock GCC/sysroot testing in https://github.com/llvm/llvm-project/blob/master/clang/test/Driver/android-gcc-toolchain.c and https://github.com/llvm/llvm-project/blob/master/clang/test/Driver/android-ndk-standalone.cpp. I am not sure that it will be easy to trip this same bug that way, but I think it is possible.
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