id summary reporter owner description type status milestone component version severity resolution keywords cc 6428 Missing include guard in error_info.hpp Andrey Semashev Emil Dotchevski The exception/error_info.hpp doesn't have an include guard. The header only contains error_info forward declaration so it doesn't cause compilation errors, but it does generate duplicate declarations in the preprocessed code. Please, add an include guard. Bugs closed To Be Determined exception Boost 1.48.0 Cosmetic fixed