On Sun, Jul 25, 2004 at 11:29:35PM -0500, Aaron W. LaFramboise wrote:
These three lines near the end of boost/type_traits/is_convertable.hpp:
TT_AUX_IS_CONVERTIBLE_FROM_FLOAT_CV_SPEC(float) TT_AUX_IS_CONVERTIBLE_FROM_FLOAT_CV_SPEC(double) TT_AUX_IS_CONVERTIBLE_FROM_FLOAT_CV_SPEC(long double)
don't compile on GCC 3.4.1 when -pedantic is specified.
This is actually sort of strange, because it compiles without warnings when -std=c++98 -Wall -W are specified, and -pedantic itself is not supposed to generate errors, only warnings.
As I understand it -pedantic disables all GNU extensions, which would otherwise be allowed with -std=c++98. This implies that without -pedantic some GNU extension accepts the code, but when that extension is disabled an error is raised because the extension contradicts the standard.
So, there is probably at least a GCC bug here. Does anyone have any idea what this is about? $ g++ -pedantic -I../boost -c stuff.cpp In file included from stuff.cpp:1: ../boost/boost/type_traits/is_convertible.hpp:274: error: long, short, signed or unsigned used invalidly for `type name' ../boost/boost/type_traits/is_convertible.hpp:274: error: long, short, signed or unsigned used invalidly for `type name' ../boost/boost/type_traits/is_convertible.hpp:274: error: redefinition of `struct boost::is_convertible<float, int64_t>'
I think it's due to the use of "long long", which isn't allowed in -pedantic mode. Or something like that. Maybe it's long double. Using -pedantic with 3.4.2 (CVS) on unix I get this diagnostic instead: boost/type_traits/is_convertible.hpp:273: error: ISO C++ does not support `long long' I think the diagnostic on mingw means that applying the "signed" modifier to "long long" is an error, similarly for "unsigned long long". Not sure why it doesn't give the same message as on unix platforms. Note that the diagnostic includes "int64_t". Could be different C99 support based on the system C headers? MinGW supports int64_t in pedantic mode, but without signed/unsigned ? Dunno. The redefinition errors are presumably because it isn't distinguishing between "signed long long" and "unsigned long long" as template params. jon -- "God is as real as I am," the old man said. My faith was restored, for I knew that Santa would never lie.