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While these flags semantically are relevant only for C++, we do add them to CMAKE_REQUIRED_FLAGS if they are detected. All flags in that variable are used both when testing compilation of C and C++ (and for detecting libraries, which uses the C compiler driver). Therefore, to be sure we safely can add the flags to CMAKE_REQUIRED_FLAGS, test for the option with the C language. This should fix compilation with GCC; newer versions of GCC do support the -nostdlib++ option, but it's only supported by the C++ compiler driver, not the C driver. (However, many builds of GCC also do accept the option with the C driver, if GCC was compiled with Ada support enabled, see [1]. That's why this issue isn't noticed in all configurations with GCC.) Clang does support these options in both C and C++ driver modes. This should fix #90332. [1] https://github.com/llvm/llvm-project/issues/90332#issuecomment-2325099254