https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77999
Bug ID: 77999 Summary: GCC leaks system header diagnostic about reserved names. Product: gcc Version: 7.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: eric at efcs dot ca Target Milestone: --- Reproducer: // g++ -std=c++14 -Werror test.cpp #include <chrono> using std::chrono::operator ""h; // error emitted on this line. // {{error: literal operator suffixes not preceded by '_' are reserved for future standardization}}