I am not a Fortran programmer (just a short experience), but I need to compile a program partly written in F77. Someone has compiled it with Absoft compiler before me, but now I need to repeat the procedure on another machine with g77. For Absoft, the makefile has
f77 -f -w -O -B100 -B108 -c *.f
mv *.f flib && mv *.o olib
f77 -B100 -o runme olib/*.o clib/*.o -L/usr/X11R6/lib64 -L/usr/X11R6/lib -lX11 -L$PVM_ROOT/lib/$PVM_ARCH -lfpvm3 -lpvm3 -L$ABSOFT/lib -lU77
I have modified these lines to be
g77 -w -O -B100 -B108 -c *.f
mv *.f flib && mv *.o olib
g77 -B100 -o runme olib/*.o clib/*.o -L/usr/X11R6/lib64 -L/usr/X11R6/lib -lX11 -L$PVM_ROOT/lib/$PVM_ARCH -lfpvm3 -lpvm3 -lgfortran -lgfortranbegin
But I get the following error messages
somefile.f:(.text+0x93): undefined reference to `for_open'
somefile.f:(.text+0xf4): undefined reference to `for_write_seq_fmt'
somefile.f:(.text+0x128): undefined reference to `for_write_seq_fmt_xmit'
somefile.f:(.text+0x454): undefined reference to `for_read_seq'
How can I fix this?
UPDATE1
If I add -libifcore to the end of the last line (linker), then I get
/usr/bin/ld: cannot find -libifcore
I have located the library
$ find /opt/intel/* -name 'libifcore*'
/opt/intel/fce/9.1.036/lib/libifcore.a
/opt/intel/fce/9.1.036/lib/libifcore.so
/opt/intel/fce/9.1.036/lib/libifcore.so.5
/opt/intel/fce/9.1.036/lib/libifcore_pic.a
/opt/intel/fce/9.1.036/lib/libifcoremt.a
/opt/intel/fce/9.1.036/lib/libifcoremt.so
/opt/intel/fce/9.1.036/lib/libifcoremt.so.5
/opt/intel/fce/9.1.036/lib/libifcoremt_pic.a
But even if I do the following in the source directory
$ export PATH=$PATH:/opt/intel/fce/9.1.036/lib/
$ ln -s /opt/intel/fce/9.1.036/lib/libifcore.so
it is not found.
Moreover, it is the same machine where I get another problem How to pass -libm to MPICC? libimf.so: warning: feupdateenv is not implemented and will always fail
It seems that the compiler should find the library, if needed
$ echo $LD_LIBRARY_PATH
/opt/intel/fce/9.1.036/lib:/opt/intel/cce/9.1.042/lib:/usr/local/lib/openmpi:/usr/local/lib:/usr/lib:
It seems that the problem was in an error in one of the source files, which wasn't a big deal for Absoft compiler. g77 was giving a warning about it, but compiling this file and producing the original errors (mentioned in the question) without a binary.
When I tried ifort, compilation of that file was aborted, but other files were compiled and a binary was created.
fortcom: Error: somefile.f, line 703: An extra comma appears in the format list. [)]
& (1p5e12.3,5h ...,))
-------------------------^
compilation aborted for somefile.f (code 1)
When I removed the extra comma, then both compilers have compiled everything and created binaries, although ifort produced a number of warnings.
Then, when I tried to run both binaries, the one made by Intel comiler was working fine, but the one by g77 was behaving very strange and didn't really do what I wanted.
So now the original problem is resolved, however the code doesn't run in multiprocessing mode, so the binary is unfortunately useless for me.