(root)/
gcc-13.2.0/
gcc/
testsuite/
gcc.dg/
cpp/
warn-trigraphs-2.c
       1  // { dg-do preprocess }
       2  // { dg-options "-std=gnu99 -fdiagnostics-show-option -Wtrigraphs" }
       3  
       4  ??=  // { dg-warning "trigraph \\?\\?= ignored, use -trigraphs to enable .-Wtrigraphs." }