Vincent Lefevre: [ Charset ISO-8859-1 converted... ] > On 2008-07-01 11:11:42 -0700, Ian Lance Taylor wrote: > > __GNUC__ is indeed defined by the compiler proper, not by the > > preprocessor. > > What do you mean here? > > Even when calling the preprocessor directly, __GNUC__ is defined: > > vin% gcc -dM -E -xc /dev/null | grep __GNUC__ > #define __GNUC__ 4 > vin% cpp -dM /dev/null | grep __GNUC__ > #define __GNUC__ 4 > > > But that in turn does not matter, as if any non-gcc compiler *did* use > > the gcc preprocessor, it would do so via gcc -E. In gcc, the > > preprocessor is not a separate program. > > But in any case, there's a separate preprocessor: cpp. And perhaps cpp > shouldn't define __GNUC__. > > (BTW, this isn't a compiler, but xrdb uses cpp by default.)
Try: $ echo ' ' | cpp -undef -dM - and determine if there's any output (varies by platform). The ctpp preprocessor undefines all builtins when -undef is present. See the URL below (plug, I know). -- Ctalk Home Page: http://www.ctalklang.org
