(root)/
gcc-13.2.0/
gcc/
testsuite/
gcc.dg/
cpp/
warn-trigraphs-4.c
       1  // { dg-do preprocess }
       2  // { dg-options "-std=gnu99 -fdiagnostics-show-option -Werror=trigraphs" }
       3  /* { dg-message "some warnings being treated as errors" "" {target "*-*-*"} 0 } */
       4  ??=  // { dg-error "trigraph \\?\\?= ignored, use -trigraphs to enable .-Werror=trigraphs." }