On Sun, 25 Nov 2018 at 13:08, <tdwrk@xxxxxxxxxxx> wrote: > > This version of gcc: > > > > $ gcc --version > > gcc (Ubuntu 7.3.0-27ubuntu1~18.04) 7.3.0 > > > > Plus this three-liner: > > > > #define badname im-not-happy > > #define initializer(a) #a > > > > char *only_a_string = initializer(badname); > > > > Produces: > > > > $ gcc -c -Werror=c++-compat /tmp/foo.c > > /tmp/foo.c:1:20: error: identifier "not" is a special operator name in C++ > [-Werror=c++-compat] > > #define badname im-not-happy > > ^ > > cc1: some warnings being treated as errors > > > > This seems pretty odd... Can someone explain what's going on? What aprt exactly are you asking about? The preprocessor sees im-not-happy as five preprocessor tokens, "im" "-" "not" "-" "happy". "not" is an operator in C++ (effectively, it's a keyword). The -Wc++-compat diagnostic is implemented in the preprocessor, which sees the token "not" and so issues a diagnostic. You asked for that diagnostic to be an error, so that's what you get.
