On Jan 8 01:40, Yaakov S wrote: > POSIX allows for <math.h> functions to also be defined as macros. > Currently, only log2 and log2f are so defined. > > These macros pose problems with a few projects which define their > own static/inline/template log2() (off the top of my head, I can > think of 2: the CRAN rgl module, and OpenCV; both are C++). Of > course, those can be fixed with an #undef log2 after the #include's. > > However, I just encountered tonight a much larger conflict: > OpenMP/C++ and <math.h> are incompatible. STC attached: > > $ g++ -D_GLIBCXX_PARALLEL -fopenmp openmp.cxx -lgomp > In file included from > /usr/lib/gcc/i686-pc-cygwin/4.3.4/include/c++/parallel/algobase.h:46, > from > /usr/lib/gcc/i686-pc-cygwin/4.3.4/include/c++/bits/stl_algobase.h:1137, > from > /usr/lib/gcc/i686-pc-cygwin/4.3.4/include/c++/bits/char_traits.h:46, > from /usr/lib/gcc/i686-pc-cygwin/4.3.4/include/c++/ios:46, > from > /usr/lib/gcc/i686-pc-cygwin/4.3.4/include/c++/ostream:45, > from > /usr/lib/gcc/i686-pc-cygwin/4.3.4/include/c++/iostream:45, > from openmp.cxx:7: > /usr/lib/gcc/i686-pc-cygwin/4.3.4/include/c++/parallel/base.h:112: > error: expected `)' before ?/? token > > It gets even worse if you #include <algorithm> as well, and no, it > doesn't help to #include <cmath>, although moving the math include > after all other includes does work. > > I see two possible solutions: > > 1) Make the log2 macros dependent on #ifndef __cplusplus; > 2) Make the parallel/* headers #undef log2 and log2f. > > Thoughts?
Sounds good to me, but that's really one for the newlib list since that affects all platforms. Would you mind to repost it there? Thanks, Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Project Co-Leader cygwin AT cygwin DOT com Red Hat -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
