I think an important point was missed in the discussion. Some seem to focus on the dishonest definition of __GNUC__ by non-GNU C compilers. That was not my point. My point is that if __GNUC__ is defined by CPP, not the GNU C compiler proper, (and this seems to be supported by the CPP Manual,) and any (non-GNU) C compiler can use CPP, then those non-GNU C compilers would "inadverdently" define __GNUC__ and lead people to believe that they are GNU C. That is why I think the GNU C compiler should define a macro independently from CPP. Or, alternatively, __GNUC__ should be defined by the GCC compiler proper, not CPP.
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