CODEWITHSUNDEEP
compilationlinkermakefilefortranfortran90
user1318806
user1318806

Reputation: 795

Compiling and linking in separate steps

I have a Fortran file my.f90 which uses some Math libraries. The two flags for the include and library files are defined in a .csh file

INC_FLAG = "-I$MATH_DIR/include/LIB_ARCH"
LINK_FLAG= "-L$MATH_DIR/lib/lib$LIB.ARCH -Bdynamic -limsl -limslblas"

In terminal this works perfectly fine

gfortran -o my.o $INC_FLAG my.f90 $LINK_FLAG

But when I try to do the compilation and linking in Separates steps I can not do it. This fails

gfortran -c $INC_FLAG my.f90
gfortran -o my.o $LINK_FLAG

I need to do the compilation and linking separately because I will have many source files (.f90) and need to make a makefile where compilation and linking are done separately. My makefile does not work either

 all: my.o
        gfortran -o my.o $(LINK_F90)
 my.o: my.f90
        gfortran $(F90FLAGS) -c my.f90 $<   
 clean: 
        rm my.o

What is going on here?

Upvotes: 1

Views: 359

Answers (1)

Alexander Vogt
Alexander Vogt

Reputation: 18098

gfortran -c $INC_FLAG my.f90 will compile the object my.o. The option -o specifies the name of the output file - as this is my.o again (in your case), this has to fail!

Try gfortran -o APPLICATIONNAME my.o $LINK_FLAG.

The same holds for the Makefile.

Upvotes: 2

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