libf2c.so problem!

[milenko76]

When I want to make file,get this:
/usr/lib/gcc/x86_64-linux-gnu/4.3.3/../../../../lib/libf2c.so: undefined reference to `MAIN__'
collect2: ld returned 1 exit status
What is going on?
How to overcome this issue?
My makefile:
FFLAGS = -O2 -g
#CFLAGS = -O -I/usr/openwin/include
CFLAGS = -O
LINK_FLAGS_AFTER='$$(PROFILE) $$(ALL_LIB) -u MAIN__
#
#rules for compiling .f files:
#
.f.o:
$(COMPILE.f) $(FFLAGS) $< $(INCS)
.c.o:
$(COMPILE.c) $(CFLAGS) $< $(INCS)

 

[milenko76]

This line is important:
f77 -o main driver.o solve_mt2d_direct.o boem.o rotz.o gebolr.o d2emod.o pobo.o mte.o d2hmod.o gsres.o mth.o z1idu.o h1iud.o phase.o
Why is he adding main ???

 

[mikrom]

Why is he adding main ???

It's not adding main. The option -o main means that the output should be placed into main, i.e. it creates the executable named main.

 

[milenko76]

Not really.I found this:
The problem is that f2c wants to link to the MAIN__ function which is the "fortran main". Apparently it is just a dummy function call. And the fix is quite simple:

Add "int MAIN__( ) { return 0; }" somewhere is the sources.

Or pass the option -u MAIN__ to the linker.

How to do this?

 

[FJacq]

Do you have a main program in your code ?

You need it else the linker will refuse to build up the executable program.

It does not depend on the programming language you use. FORTRAN , C, C++ of JAVA programs need a main program.



François Jacq