[R] Problem w/cygwin1.1 (maybe)

[Prof Brian D Ripley]

On Wed, 24 May 2000 Setzer.Woodrow at epamail.epa.gov wrote:

> I am using rw1001 on Windows 98.  I have a package that involves both c and
> fortran code, which compiled successfully under cygnus b20.1 with Mummit Kahn's
> port of gcc 2.95.2.  I have upgraded to the new net release of cygwin (version
> 1.1, including the recent cygwin package upgrade to 1.1.1).  Now when the dll

I have had a lot of problems with the cygwin net releases, and their
mailing list shows that I am not alone.  The version of make up currently
is broken (and they know the cause and have not re-made it) and there are
further problems with the 1.1.1 DLL that mean that re-direction in
Makefiles fails (and that is used extensively in the R Makefiles).


> for my package is being created, I get the string of errors like:
> 
> [...]
> gcc -mno-cygwin -mdll  -Wl,--base-file,odesolve.b -s  -o odesolve.dll odesolve.e
> odesolve.a  -L/R/rw1001/src/gnuwin32  -lg2c -lR
> /usr/lib/gcc-lib/i686-pc-cygwin/2.95.2/libg2c.a(sfe.o)(.text+0x4e): undefined
> reference to `__errno'
> /usr/lib/gcc-lib/i686-pc-cygwin/2.95.2/libg2c.a(sfe.o)(.text+0xb9): undefined
> reference to `__errno'
> /usr/lib/gcc-lib/i686-pc-cygwin/2.95.2/libg2c.a(sfe.o)(.text+0xf3): undefined
> reference to `__errno'
> /usr/lib/gcc-lib/i686-pc-cygwin/2.95.2/libg2c.a(fmt.o)(.text+0x51): undefined
> reference to `__errno'
> /usr/lib/gcc-lib/i686-pc-cygwin/2.95.2/libg2c.a(fmt.o)(.text+0x9d): undefined
> reference to `_impure_ptr'
> [...]
> 
> Presumably, somewhere I have configured either MkRules or my cygwin installation
> incorrectly, but I cannot see where I've gone wrong.  I wonder if someone on the
> list recognizes this error, or can give me some hints?  Thanks!

Looks like you have the wrong libg2c.a in use, the cygwin not -mno-cygwin
one.  What do you have set as FLIBS in MkRules?  In rw1001 it says

#-L(directory where gcc-2.95-mingw-extra.tar.gz was uncompressed)
FLIBS=-L/cygnus/cygwin-b20/mingw32/lib -lg2c

I don't see any sign of pointing you at a particular lg2c (but do not
know if that is needed under cygwin 1.1.1).

It is pretty irritating that every time I `upgrade' cygwin something else
breaks.  For rw1010 we intend to support only the mingw32 compiler
and a set of tools we will make available that we know works.  For example,
I compiled up a version of make 3.79 from the GNU make sources.  The
mingw32 compilers are just as easy to install and use, and they seem very
stable.

-- 
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 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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