On Wed, Apr 27, 2011 at 7:01 AM, Jonathan Wakely <jwakely.gcc@xxxxxxxxx> wrote: > On 27 April 2011 06:11, Jeffrey Walton wrote: >> 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). > > Examples please. That would be a serious bug and should be reported to > bugzilla rather than alluded to vaguely on a mailing list. OK. When I encounter it again, I will let you know. > mgl/mgl.h is not "standard linux stuff" so we can't do anything about > that, but I'm pretty sure there are no conflicts between libstdc++ > headers and glibc headers (when used correctly) OK. Perhaps I was doing something incorrectly. Jeff
