"Daniel Richard G." <skunk@xxxxxxxxxx> writes:
> On Thu, 2010 Apr 15 21:29+0200, Alex Riesen wrote:
> >
> > That one may be better handled at one place (git-compat-util.h?) with
> > something like:
> >
> > #ifdef Tru64
> > #define MAP_FAILED ((void *)MAP_FAILED)
> > #endif
>
> I agree with the sentiment, but you can't have a macro refer to itself
It can. From (cpp.info)
3.10.5 Self-Referential Macros
------------------------------
A "self-referential" macro is one whose name appears in its definition.
Recall that all macro definitions are rescanned for more macros to
replace. If the self-reference were considered a use of the macro, it
would produce an infinitely large expansion. To prevent this, the
self-reference is not considered a macro call. It is passed into the
preprocessor output unchanged.
[...]
One common, useful use of self-reference is to create a macro which
expands to itself. If you write
#define EPERM EPERM
--
Jakub Narebski
Poland
ShadeHawk on #git
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