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Before CWG DR 1955 the controlling expression for an #elif must be syntactically correct, meaning this won't compile with C++11 compilers such as gcc 4.8: The solution is to define __has_include(X) as 0 for compilers that don't support it. The second problem is that when <source_location> is found, it is used without the std:: qualification. libcody/ChangeLog: * internal.hh: Define fallback macros for __has_builtin and __has_include. Use __has_builtin for __builtin_FILE and __builtin_LINE. Define alias for std::source_location.
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