Connor, >Date: Mon, 04 Aug 2003 14:11:36 -0700 >From: "Flynn, Connor J" <address@hidden> >Organization: NOAA/PNL >To: Steve Emmerson <address@hidden> >Subject: RE: 20030804: udunits on cygwin The above message contained the following: > I've cc'd the developer (Jason Christy) working for me that actually > understands what is going on (at least much better than I). Please > include Jason on further contact because I'll soon be out of my depth. ... > Well I'll be... I didn't believe you at first and proceeded to dig deep > inside your make files and Cywgin bash and sh to prove it to myself. > You're absolutely right. > > Anyway, I guess Cygwin users should be instructed to alter their > environment space and change the input files. Instead of changing the > configure script I also tried modifying src\port\master.mk.in file to > reverse the test for C vs C++ (so the case-insensitive test defaults to > C) as below: > > dummy_prog $(PROGRAM): $(OBJS) > @if [ -r address@hidden -o -r address@hidden ]; then \ > ld='$(FC) -o $@ $(FFLAGS)'; \ > elif [ -r address@hidden ]; then \ > ld='$(CC) -o $@ $(CFLAGS)'; \ > elif [ -r address@hidden -o -r address@hidden ]; then \ > ld='$(CXX) -o $@ $(CXXFLAGS)'; \ > else \ > ld='$(CC) -o $@ $(CFLAGS)'; \ > fi; \ > > This works too. > > At this point, the cygwin user need only add one environment variable > (apparently any of the fortran flags) and make one change to the > master.mk.in file above. > > Which brings me back to the Fortran flag. If UDUNITS doesn't use the > fortran compiler, then why check for it? Can you please explain? The UDUNITS package doesn't use a Fortran compiler, but it does build a Fortran-callable interface from C code. Because the argument-passing conventions used by Fortran are compiler-dependent, the C compiler must be told what set of conventions to use. This is the reason for defining a particular C macro in the CPPFLAGS environment variable from the candidates in the file "cfortran.h". If the Fortran interface of the UDUNITS package won't be used, then it doesn't matter which C macro is defined -- only that one is. If the Fortran interface will be used, then it is necessary to define the appropriate C macro. > Ciao for now! > Connor Regards, Steve Emmerson
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