masalah makefile gfortran

Saya memiliki program penulisan di fortran yang menggunakan perpustakaan. Untuk kompilasi saya menggunakan skrip shell sederhana dan semuanya baik-baik saja:

gfortran -c mod_input.f90 mod_cpp.f90 mod_data.f90 main.f90 b_coils.f

gfortran -o main mod_input.o mod_cpp.o mod_data.o main.o b_coils.o libspline.a -lstdc++

(libspline.a - penulisan perpustakaan di c++)

Sekarang saya ingin menggunakan makefile daripada skrip shell, tetapi tidak tahu cara menulisnya dengan benar.

Makefile:

target = main
srcdir = src/
objdir = obj/
targetdir = run/

FORT = gfortran
mflag = module
FORTFLAGS =
LDFLAGS = -lstdc++  

MKLPATH =/home/gatto/Desktop/ray_u3/src
LIBDIR  =-L$(MKLPATH)
LIBS = -lspline                                                             
MODDIR = obj/                                                           

# Ray sources
sources = mod_input.f90 mod_cpp.f90 mod_data.f90  main.f90 b_coils.f


# objects
objects  = $(patsubst %.for,%.o,$(filter %for,$(sources)) )
objects += $(patsubst %.f90,%.o,$(filter %f90,$(sources)) )

# main target
build:$(targetdir)$(target)

# build rules
$(targetdir)$(target):$(addprefix $(objdir),$(objects))
    @echo === build $@ ===
    $(FORT) $(FORTFLAGS) $(LDFLAGS) $(LIBDIR) -o $@ $(LIBS) $^

#compilation target
compile :$(addprefix $(objdir),$(objects))

# compilation rules
$(objdir)%.o : $(srcdir)%.f90
    @echo === compile $< ===
    $(FORT) -c $(objdir) $(FORTFLAGS) -o $@ $<

$(objdir)%.o : $(srcdir)%.f
    @echo === compile $< ===
    $(FORT) -c $(objdir) $(FORTFLAGS) -o $@ $<


# cleaning rules
cleanobj:
    -rm $(objdir)*.o $(objdir)*.mod
cleantarget:
    -rm $(targetdir)$(target)

cleanall:cleanobj cleantarget

.PHONY: compile build cleanall cleanobj cleantarget

Keluaran:

gfortran  -lstdc++   -L/home/gatto/Desktop/ray_u3/src -o run/main -lspline obj/mod_input.o obj/mod_cpp.o obj/mod_data.o obj/main.o
obj/mod_data.o: In function `__global_data_MOD_modbfield':
mod_data.f90:(.text+0x3e2): undefined reference to `gbcoil_'
obj/mod_data.o: In function `__global_data_MOD_moddensity':
mod_data.f90:(.text+0x5d4): undefined reference to `GetSplineValue'
mod_data.f90:(.text+0x64f): undefined reference to `GetSplineValue'
mod_data.f90:(.text+0x6ca): undefined reference to `GetSplineValue'
mod_data.f90:(.text+0x745): undefined reference to `GetSplineValue'
obj/mod_data.o: In function `__global_data_MOD_inpfile':
mod_data.f90:(.text+0xa66): undefined reference to `Approx_input'
mod_data.f90:(.text+0xa75): undefined reference to `SetSpline'
collect2: error: ld returned 1 exit status
make: *** [run/main] Error 1