Re: Compilation with g77 works but not with gfortran

[Axel Freyn <axel-freyn@gmx.de>]

Hi Paul,

On Fri, Feb 04, 2011 at 06:46:53PM +0100, Paul van Hoven wrote:
> I have an extension for matlab that i want to compile. The machine on  
> which I compile the code has a g77-3.4 and a gfortran-4.2 compiler  
> installed. If I set the fortran compiler in the Makefile to g77-3.4 the  
> compilation process runs through without any error messages and I can  
> use the extension without any problems.
>
>
> [...]
> /net/matlab/Matlab2009b/bin/mex -cxx CXX=/usr/site-local/bin/g++-4.2  
> CC=/usr/site-local/bin/g++-4.2 FC= LD=/usr/site-local/bin/g++-4.2 -lg2c  
> -lm \
>        -O -output lbfgsb.mexa64 solver.o matlabexception.o  
> matlabscalar.o matlabstring.o matlabmatrix.o arrayofmatrices.o program.o  
> matlabprogram.o lbfgsb.o
> solver.o: In function `timer_':
> solver.f:(.text+0x17c4): undefined reference to `_gfortran_etime'
> solver.o: In function `dcsrch_':
> solver.f:(.text+0x1b66): undefined reference to `_gfortran_compare_string'
> solver.f:(.text+0x1ca7): undefined reference to `_gfortran_compare_string'
> solver.f:(.text+0x20d8): undefined reference to `_gfortran_compare_string'
> solver.f:(.text+0x2215): undefined reference to `_gfortran_compare_string'
> solver.o: In function `subsm_':
> solver.f:(.text+0x2cce): undefined reference to `_gfortran_st_write'
> solver.f:(.text+0x2ce2): undefined reference to  
> `_gfortran_transfer_character'
> solver.f:(.text+0x2cea): undefined reference to `_gfortran_st_write_done'
> ...
> ...long list of errors...
> ...
> solver.f:(.text+0xb31c): undefined reference to `_gfortran_st_write'
> solver.f:(.text+0xb324): undefined reference to `_gfortran_st_write_done'
> solver.o: In function `setulb_':
> solver.f:(.text+0xb58c): undefined reference to `_gfortran_compare_string'
> collect2: ld returned 1 exit status
>
>    mex: link of ' "lbfgsb.mexa64"' failed.

You have to link with the gfortran-library. g2c only works with g77.
If you add "-lgfortran" to the link command, everything should work
well (I hope :-))

Axel