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When linting an header file in C or C++, `-x c-header` or `-x c++-header` should be used instead of `-x c` or `-x c++`. Using `-x c` or `-x c++` for headers files can lead to unused variables and functions marked as static inlined as seen in #4096. Using `-x c-header` or `-x c++-header` solve these issues. The list of file extensions that are considered as header files can be configured with the variables `g:ale_c_cc_header_exts` and `g:ale_cpp_cc_header_exts`.