Re: Need Help in compiling

[David Z Maze <dmaze@debian.org>]

sajid hameed <sajidhh@yahoo.ca> writes:

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> i have started using unix recently i have an problem using fortran
> i have write a program in fortran namely test.f that uses a subroutine 
> displaymessage.f and this subroutine uses another subroutine display.f
> i compiled all of them in single library say libt.a when a make an 
> executable file of it the error is
> No Main Fortran Program to execute 

What commands, exactly, are you using to do this?  This is a little
unusual way to compile programs.  In C, at least, I happen to know
that putting main() in a library would work.  Playing around with g77,
though, it looks like this fails.  That is, if main.f is

C     main.f: pull some FORTRAN code...
      PROGRAM MAIN
      CALL PRINTMESSAGE
      END

and printmessage.f is

C     printmessage.f: define the PRINTMESSAGE subroutine
      SUBROUTINE PRINTMESSAGE
      V = 17
      WRITE(*,*) V
      END
      
I can use 'g77 -c main.f' to get main.o, 'g77 -c printmessage.f' to
get printmessage.o, and 'g77 main.o printmessage.o' to get a binary
(a.out).  I can use 'ar cru libpm.a printmessage.o' to get a library
containing the PRINTMESSAGE subroutine, then use 'g77 -L. main.o -lpm'
to get the same a.out binary.  But putting main.o in a libary doesn't
work at all.

I suspect that some of this is the behavior of the system linker with
respect to libraries.  But really, the best answer is "don't do that":
if it doesn't work on Linux, it seems unlikely to go on any other
Unix-like system either.

-- 
David Maze         dmaze@debian.org      http://people.debian.org/~dmaze/
"Theoretical politics is interesting.  Politicking should be illegal."
	-- Abra Mitchell