[Bug libstdc++/54112] New: including complex.h and complex fails in C++03

["glisse at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54112

             Bug #: 54112
           Summary: including complex.h and complex fails in C++03
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: glisse@gcc.gnu.org


#include <complex.h>
#ifdef FIX
#undef complex
#endif
#include <complex>

fails to compile with glibc. Since libstdc++ already installs a complex.h
wrapper that #include_next complex.h, I guess it could easily #undef complex
afterwards.

Note that you can include tr1/complex instead of complex if you prefer.

I guess I could also ask glibc to protect their #define with #ifndef
__cplusplus.

It is strange that in C++11 it is impossible to have access to the C99
functions cacos and others, since C++11 hijacks their header. g++ accepts
_Complex, I expect we should still have access to those functions.