[CW7] odd build errors in math lib when C++ enabled

This question appears to have been asked before but no satisfactory
answer was turned up by Google.

I have enabled C++ on a Carbon project (using MacCarbonHeaders) and am
finding compilation aborts with a large number of errors of the form:

Error : ')' expected
cmath.macos.h line 755 ((long double) nextafterd((double)(long double
x),(double)(long double y)))

Error : declaration syntax error
cmath.macos.h line 756 {return nextafterd((double)x, (double)y);}

This has been reported by others with CW6 & 8, and I am observing it
with CW7. Anyone have any idea if there is a workaround/fix for this
(other than hope for the best with 9)? I've fiddled with a few things
such as inline settings, order of access paths, but nothing seems to
help. I don't know if it's connected but the source files it's
attempting to compile are named '.c' even though C++ has been enabled
in the project settings.

--Toby

MW Ron wrote:
> In article <1120606767.847344.21980.RemoveThis@o13g2000cwo.googlegroups.com>,
> "toby" <toby.RemoveThis@telegraphics.com.au> wrote:
>
> >This question appears to have been asked before but no satisfactory
> >answer was turned up by Google.
> >
> >I have enabled C++ on a Carbon project (using MacCarbonHeaders) and am
> >finding compilation aborts with a large number of errors of the form:
> >
> >Error : ')' expected
> >cmath.macos.h line 755 ((long double) nextafterd((double)(long double
> >x),(double)(long double y)))
> >
> >Error : declaration syntax error
> >cmath.macos.h line 756 {return nextafterd((double)x, (double)y);}
> >
> >This has been reported by others with CW6 & 8, and I am observing it
> >with CW7. Anyone have any idea if there is a workaround/fix for this
> >(other than hope for the best with 9)? I've fiddled with a few things
> >such as inline settings, order of access paths, but nothing seems to
> >help. I don't know if it's connected but the source files it's
> >attempting to compile are named '.c' even though C++ has been enabled
> >in the project settings.
>
> I think you are using the wrong precompiled header or need to
> update...Here is the FAQ
>
> Q) I can't use math.h with the precompiled carbon MacHeaders. How can
> I fix that?
>
> A) Using the new MacHeaders for carbon builds includes Carbon.h which in
> turn includes CoreServices.h, which then includes fp.h. This means that
> if you use MacHeadersCarbon.h as it shipped with CW7 you won't be able
> to use math.h because of a conflict. The next CodeWarrior patch should
> resolve this.

I'm really looking for a solution for CW7. Perhaps I can find a
workaround by avoiding the precompiled header - but it seems as if
Carbon.h unavoidably breaks math.h The problem does seem confined
to C++ builds.

Thanks for the response, at least it's a known issue.

>
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> Ron Liechty - MWRon.RemoveThis@metrowerks.com - http://www.codewarrior.com