matlab - Errors in linking fortran code that imports a MAT-file -

this question has answer here:

• reading data matlab files c 1 answer

i have import mat-file in fortran program. followed example file facing problems while linking. compilation happens fine.

minimal code:

#include "fintrf.h"  program main   use ssa use dmotifs use param  implicit none  ! mat-file declarations !  integer matopen, matgetdir  integer matgetvariableinfo integer mp, dir, adir(100), pa integer mxgetm, mxgetn, matclose integer ndir, i, clstat character*32 names(100)   !===========================!  if(all(fnames(:)%fn .ne. argfun))     write(*,*) "no such motif: ",argfun     write(*,*) "input format-> main <motifname>"     stop else      fin=fchton(argfun)       y0=nm2m*analys(p,argfun)      ! ==> open mat-file <== !      mp=matopen('./prms_lxr_29apr15.mat','r')      if (mp .eq. 0)          write(6,*) "can't open mat-file"          stop     end if      dir = matgetdir(mp, ndir)        if (dir .eq. 0)          write(6,*) "can't read mat-file-directory."          stop     endif      call mxcopyptrtoptrarray(dir, adir, ndir)      20 i=1,ndir          call mxcopyptrtocharacter(adir(i), names(i), 32)  20 continue      write(6,*) 'directory of mat-file:'      30 i=1,ndir         write(6,*) names(i)  30 continue      write(6,*) 'getting header info first array.'     pa = matgetvariableinfo(mp, names(1))     write(6,*) 'retrieved ', names(1)     write(6,*) '  size ', mxgetm(pa), '-by-', mxgetn(pa)     call mxdestroyarray(pa)      clstat=matclose(mp)  end if end program main 

i using gfortran 4.8.3 compiling+linking using default command:

gfortran main.f90 dmotifs.o param.o ssa.o -o main 

this code compiles fine (without linking) when not include: #include "finitrf.h", otherwise compiler says

warning: main.f90:1: illegal preprocessor directive 

i tried renaming finitrf.h finitrf.f90 did not make difference. nonetheless during linking getting these errors:

main.f90:(.text+0x3ea): undefined reference `matopen_' main.f90:(.text+0x487): undefined reference `matgetdir_' main.f90:(.text+0x52b): undefined reference `mxcopyptrtoptrarray_' main.f90:(.text+0x583): undefined reference `mxcopyptrtocharacter_' main.f90:(.text+0x71b): undefined reference `matgetvariableinfo_' main.f90:(.text+0x804): undefined reference `mxgetm_' main.f90:(.text+0x855): undefined reference `mxgetn_' main.f90:(.text+0x89c): undefined reference `mxdestroyarray_' main.f90:(.text+0x8b0): undefined reference `matclose_' collect2: error: ld returned 1 exit status 

do need makefile or add additional arguments in compile command?

edit:

i added -cpp option , eliminates problem of illegal preprocessor directive

now when compiling paths matlab external components (where finitf.h) is, still getting same error.

gfortran main.f90 dmotifs.o param.o ssa.o -i/usr/local/matlab2008a/extern/include -l/usr/local/matlab2008a/extern/lib -cpp -o main 

if provide library path /usr/local/matlab2008a/bin/glnxa64 contains other matlab libraries including libmat.so, still same errors.

for lower case file extensions *.f90 or *.f pre-processor typically deactivated. enable that, either rename (main) file have capital extension *.f90 or *.f, or provide corresponding command-line option (-cpp gfortran, -fpp ifort).

assuming missing subroutines/functions declared in fintrf.h, should solve problem.

you should additionally tell compiler link against libraries containing matlab functions.