Customising CPP flags to match Fortran flags

[Mark Hadfield]

Ed Hartnett wrote:
> If you set FFLAGS, FCFLAGS, and F90FLAGS to the flags you want, before
> running the netCDF configure, that should work. Doesn't it?
>   
No. Configure does the relevant test and gets the right answer...

   checking for C-equivalent to Fortran routine "SUB"... SUB

...but symbols in libnetcdf.a follow the f2cFortran convention, i.e. 
lower case with 2 underscores. (And if I set CPPFLAGS=-DpgiFortran the 
symbols follow that convention, lower case with 1 underscore.)

I'm unclear about how the result of the configure test is supposed to 
affect the build system. My experience suggests that it doesn't.

> Make sure you do a make distclean first when changing the flags!
>   
Yes. I usually delete all files and unpack from source again just to be 
sure.

I've found a successful workaround:

Unpack and configure:

CC=gcc FC=g95 CPPFLAGS=-DpgiFortran FFLAGS="-fno-underscoring 
-fcase-upper" ./configure --disable-f90 --disable-cxx

Edit cfortran.h, changing line 198 to

#define fcallsc(UN,LN)               UN

Run make, make check & make install as usual.

NB1: I didn't bother with FCFLAGS and F90FLAGS 'cause I don't need f90.
NB2: I don't need cxx either.
NB3: I explicitly specifed pgiFortran to disable the big block of 
special-case code for f2cFortran near the end of ncfortran.h.

I'm happy with this, but still interested in a more elegant method, of 
course.

-- 
Mark Hadfield          "Ka puwaha te tai nei, Hoea tahi tatou"
m.hadfield at niwa.co.nz
National Institute for Water and Atmospheric Research (NIWA)



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