[R] configure problem - mixed fortran/c

[Prof Brian Ripley]

On Fri, 30 Apr 2004, Skip Montanaro wrote:

> I'm trying to build R 1.9.0 to get the opportunity to build rpy for some
> folks at my office.  (I'm a Python guy, not an R guy, so I'm completely
> unfamiliar with the machinations of building R.)  I'm having trouble getting
> past the configure step.  A plain old configure generates this output at the
> end:
> 
>     checking whether we can compute C Make dependencies... yes, using gcc -MM
>     checking whether gcc supports -c -o FILE.lo... yes
>     checking how to get verbose linking output from g77... -v
>     checking for Fortran libraries of g77...  -L/usr/ccs/lib -L/usr/lib -L/usr/local/lib -L/opt/lang/gcc-g77-3.3.2/lib/gcc-lib/i386-pc-solaris2.8/3.3.2 -L/usr/ccs/bin -L/opt/lang/gcc-g77-3.3.2/lib/gcc-lib/i386-pc-solaris2.8/3.3.2/../../.. -lfrtbegin -lg2c -lm -lgcc_s
>     checking for dummy main to link with Fortran libraries... none
>     checking for Fortran name-mangling scheme... lower case, underscore, extra underscore
>     checking whether g77 appends underscores to external names... yes
>     checking whether mixed C/Fortran code can be run... configure: WARNING: cannot run mixed C/Fortan code
>     configure: error: Maybe check LDFLAGS for paths to Fortran libraries?
> 
> I'm having trouble deciphering what exactly the configure script is testing
> at that point. 

Building an executable from a C and a Fortran file.

>  Based upon the message it emitted last it looks like it's
> trying to link conftestf.o and conftest.o (around line 25747), but in the
> config.log file I don't see it getting that far (around line 25500).  I saw

Without an extract from the log it is hard for us to comment.

> no obvious configure options which would allow me to worm around this
> problem.

There is one, and it told you, `check LDFLAGS for paths to Fortran
libraries'. I don't see that you have told us the result of your check, so
surmise you haven't checked, and suspect that is the problem.

> My environment is:
> 
>     Solaris 9 on Intel
>     gcc and g77 3.3.2

You need wherever libg2c.so is installed in your LD_LIBRARY_PATH.

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595