[Bug libstdc++/1773] __cplusplus defined to 1, should be 199711L

["ro at CeBiTec dot Uni-Bielefeld.DE" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=1773

--- Comment #97 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> 2011-08-01 12:52:50 UTC ---
> --- Comment #91 from Marc Glisse <marc.glisse at normalesup dot org> 2011-07-30 21:02:20 UTC ---
> solaris also provides the pow(*,int) overloads (see DR550). Should these be
> fixincluded out? On the other hand, solaris doesn't provide the cos(int)
> overload, so cos(0) fails as ambiguous (like with sunpro) if one includes
> math.h and not cmath. Should this be ignored? or the integral overload
> fixincluded into math.h? or an extra math.h shipped that is equivalent to cmath
> (careful to use #include_next)?

If there's wording in the C++ standard that suggests the cos(int)
overload should exist, I could file a bug with Oracle.

> In any case, as already mentioned, we'll have trouble with different versions
> of solaris providing different things in their headers. The solution of having
> __cplusplus as 199711L except for system headers where it is 1 seems easier.

Given the mess with STDC_0_IN_SYSTEM_HEADERS, I'd avoid something like
this if at all possible.

    Rainer