On Tue, Apr 26, 2011 at 8:55 AM, Jonathan Wakely <jwakely.gcc@xxxxxxxxx> wrote: > >> >>> [SNIP] >>> >>> Please try to reproduce the error with a minimal example to show >>> whether you get that error just from including a header, or only under >>> certain circumstances. >> >> I managed to track it down to the following test.cpp file: >> >> #include <cmath> >> #include <mgl/mgl.h> >> #include <algorithm> >> >> Where mgl is from the wxWidgets library, version 2.8.11 >> >> When I changed the order to: >> #include <cmath> >> #include <algorithm> >> #include <mgl/mgl.h> >> >> It worked. > > That would imply the mgl.h header does something it shouldn't, such as > defining isnan as a macro, or something else which breaks the standard > library header. > I've also seen similar in the past. I seem to recall (like Anna) that the C++ gear had to be included before [some of] the standard linux stuff such as sys/types, sys/socket.h, and netinet/in.h. Fortunately, the standard linux headers do a good job of guarding for multiple definitions (when they follow C++ headers). The C++ headers, on the other hand, do not always do a good job (when they follow standard headers). Jeff
