gcc-4.9/gcc/testsuite/gcc.dg/cpp/warn-cxx-compat-2.c


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// { dg-do preprocess }
// { dg-options "-std=gnu99 -fdiagnostics-show-option -Werror=c++-compat" }
/* { dg-message "some warnings being treated as errors" "" {target "*-*-*"} 0 } */
#define not !  // { dg-error "identifier \"not\" is a special operator name in C\\+\\+ .-Werror=c\\+\\+-compat." }