llvmlibc-implementation-in-namespace

Checks that all declarations in the llvm-libc implementation are within the correct namespace.

// Correct: implementation inside the correct namespace.
namespace __llvm_libc {
    void LLVM_LIBC_ENTRYPOINT(strcpy)(char *dest, const char *src) {}
    // Namespaces within __llvm_libc namespace are allowed.
    namespace inner{
        int localVar = 0;
    }
    // Functions with C linkage are allowed.
    extern "C" void str_fuzz(){}
}

// Incorrect: implementation not in a namespace.
void LLVM_LIBC_ENTRYPOINT(strcpy)(char *dest, const char *src) {}

// Incorrect: outer most namespace is not correct.
namespace something_else {
    void LLVM_LIBC_ENTRYPOINT(strcpy)(char *dest, const char *src) {}
}