Hi all, I've identified a major issue which occurs with gfortran in MacPorts, but since I can't identify which dependency is responsible (all I know is that it's due to the binary builds), I thought I'd post here to ask for help.
To give some background, Fortran has the option to declare floats using real(kind) where kind is a number related to the default precision, and typically (although not in the fortran standard) this corresponds to the number of bytes used to store values. So real(4) is a 32-bit float, real(8) is a 64-bit float, etc. All major fortran compilers stick to this convention for reasons of backward compatibility. However, the standard now recommends (looking to the future) that rather than use e.g. 4 or 8, one uses helper functions to determine the correct kind for a desired precision. So with all major compilers (including gfortran), the following code: program test implicit none print *, selected_int_kind(13) print *, selected_real_kind(p=6,r=37) print *, selected_real_kind(p=15,r=307) end program test returns 8 4 8 However, after upgrading outdated ports recently, the macports gfortran suddenly returned 16 8 10 which is making it impossible to compile a lot of legacy code (and causes values to take up twice as much RAM). What happened was that one of the dependencies for gcc got upgraded to the binary build, and this causes all the different versions of gfortran (from gcc43 to gcc47) to change their output (without being upgraded themselves, which tells me that it is an issue with a dependency, not gcc itself). If I install MacPorts (on 10.7) then gcc45 from scratch with binary packages, the issue is there. If I install all packages from scratch with the -s flag, the issue disappears. This suggests to me that there is an issue with one of the binary builds. Of course, the temporary solution for me is simply to force the -s flag to always be used, but I think this issue should be fixed, as it makes the gfortran compilers in MacPorts unusable otherwise. Any ideas? Thanks, Tom _______________________________________________ macports-dev mailing list macports-dev@lists.macosforge.org http://lists.macosforge.org/mailman/listinfo.cgi/macports-dev