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As the testcase show, sometimes _Pragma is turned into CPP_PRAGMA .. CPP_PRAGMA_EOL tokens, even when it might still need to be stringized later on. We are then ICEing because we don't handle stringification of CPP_PRAGMA or CPP_PRAGMA_EOL, but trying to reconstruct the exact tokens with exact spacing after it has been lowered is very hard. So, instead this patch ensures we don't lower _Pragma during expand_arg calls, but only later when cpp_get_token_1 is called outside of expand_arg. 2021-11-22 Jakub Jelinek <jakub@redhat.com> Tobias Burnus <tobias@codesourcery.com> PR preprocessor/103165 libcpp/ * internal.h (struct lexer_state): Add ignore__Pragma field. * macro.c (builtin_macro): Don't interpret _Pragma if pfile->state.ignore__Pragma. (expand_arg): Temporarily set pfile->state.ignore__Pragma to 1. gcc/testsuite/ * c-c++-common/gomp/pragma-3.c: New test. * c-c++-common/gomp/pragma-4.c: New test. * c-c++-common/gomp/pragma-5.c: New test. Co-Authored-By: Tobias Burnus <tobias@codesourcery.com>