User:Dbright/patch cgal for netbsd
This is how to patch CGAL to compile on NetBSD x86 / amd64.
CGAL's "FPU.h" by default looks for fenv.h. As of late 2011, the released versions of NetBSD don't contain fenv.h. The updated development versions of NetBSD do include it, but the release version does not.
We can kludge FPU.h so that it uses NetBSD's "ieeefp.h" instead of fenv.h. I have no idea if this actually works mathematically, but at least CGAL compiles. You only need to edit one file.
Replace these lines:
// Nothing to include. #else # include <fenv.h> #endif
// Nothing to include. #elif defined __NetBSD__ #include <ieeefp.h> #else # include <fenv.h> #endif
#else // This is a version following the ISO C99 standard, which aims at portability. // The drawbacks are speed on one hand, and also, on x86, it doesn't fix the
replace with this:
#elif defined __NetBSD__ #define CGAL_IA_SETFPCW(CW) fpsetround(fp_rnd(CW)) #define CGAL_IA_GETFPCW(CW) CW = fpgetround() typedef int FPU_CW_t; #define CGAL_FE_TONEAREST FE_TONEAREST #define CGAL_FE_TOWARDZERO FE_TOWARDZERO #define CGAL_FE_UPWARD FE_UPWARD #define CGAL_FE_DOWNWARD FE_DOWNWARD #else // This is a version following the ISO C99 standard, which aims at portability. // The drawbacks are speed on one hand, and also, on x86, it doesn't fix the
development versions of NetBSD apparently do include fenv.h, so in a few years this page will be obsolete, hopefully!