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POhow to compile multi-folder Fortran Project having interfaces, modules and subroutines
 

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  1. POhow to compile multi-folder Fortran Project having interfaces, modules and subroutines
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    <p>I am new to Fortran. I am working on a research project where I am using an open source project that has several files distributed in multiple folders. i found the dependency of each programs but could not figure out how to compile them.</p> <p>I have source code distributed in three folders. a)modules b)interfaces c)subroutines</p> <p>I would like to run a program named as 'Main.f90' in subroutines folder, this program has dependency of source codes from modules and interfaces folders.</p> <p>I am using eclipse for folder structure and makefile to compile.</p> <p>Any help with this is appreciated.</p> <p><strong>UPDATE:</strong> I followed the answer posted by @MBR and @Stefan, for some reason VPATH did not able to find programs in source code so I explicitly gave path to those source folder in my <em>Makefile</em>. below is my make file script.</p> <pre><code> .PHONY: Mopac_exe clean # Change this line if you are using a different Fortran compiler FORTRAN_COMPILER = gfortran SRC = src #make main program Mopac_exe: subroutines mopac.o $(FORTRAN_COMPILER) mopac.o *.o -O2 -g -o bin/Mopac_exe -I Modules/ #compile all the subroutines subroutines: interfaces $(FORTRAN_COMPILER) -c $(SRC)/subroutines/*.F90 -J Modules/Subroutines/ -I Modules/ #compiles all the interfaces interfaces: modules $(FORTRAN_COMPILER) -c $(SRC)/interfaces/*.f90 -J Modules/ # build all the modules and generate .mod file in Modules directory modules: build_vast_kind $(FORTRAN_COMPILER) -c $(SRC)/modules/*.f90 -J Modules/ $(FORTRAN_COMPILER) -c $(SRC)/modules/*.F90 -J Modules/ # compile vastkind.f90 files and generates the .mod file in Modules directory.Every other Modules and interfaces are dependent on this. build_vast_kind:clean $(FORTRAN_COMPILER) -c $(SRC)/modules/vastkind.f90 -J Modules/ clean: rm -f bin/Mopac_exe *.mod rm -f Modules/*.mod rm -f *.o </code></pre> <p>I compiled all the modules and placed in Modules directory of root Folder. All compilation goes well. I get error when I build the executable. I get following error. </p> <pre><code> gfortran mopac.o *.o -O2 -g -o bin/Mopac_exe -I Modules/ mopac.o: In function `main': mopac.F90:(.text+0x27c1): multiple definition of `main' mopac.o:mopac.F90:(.text+0x27c1): first defined here getdat.o: In function `getdat_': getdat.F90:(.text+0x22): undefined reference to `iargc_' getdat.F90:(.text+0xf2): undefined reference to `getarg_' symr.o: In function `symr_': symr.F90:(.text+0xd3f): undefined reference to `symp_' writmo.o: In function `writmo_': writmo.F90:(.text+0x20c2): undefined reference to `volume_' collect2: error: ld returned 1 exit status make: *** [Mopac_exe] Error 1 </code></pre> <p>`iargc_' is being used in 'getdat file and iargc is already compiled. why there is error while making the executable saying undefined reference? what am I missing?</p>
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