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This patch adds a warning switch for "#pragma once in main file". The warning option name is Wpragma-once-outside-header, which is the same as Clang provides. PR preprocessor/89808 gcc/c-family/ChangeLog: * c.opt (Wpragma_once_outside_header): Define new option. * c.opt.urls: Regenerate. gcc/ChangeLog: * doc/invoke.texi (Warning Options): Document -Wno-pragma-once-outside-header. libcpp/ChangeLog: * include/cpplib.h (cpp_warning_reason): Define CPP_W_PRAGMA_ONCE_OUTSIDE_HEADER. * directives.cc (do_pragma_once): Use CPP_W_PRAGMA_ONCE_OUTSIDE_HEADER. gcc/testsuite/ChangeLog: * g++.dg/warn/Wno-pragma-once-outside-header.C: New test. * g++.dg/warn/Wpragma-once-outside-header.C: New test. Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org> Reviewed-by: Marek Polacek <polacek@redhat.com>