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From: kwh@sei.cmu.edu (Kurt Hoyt)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Mixed language programs
Message-ID: <2641@aw.sei.cmu.edu>
Date: Sat, 26-Sep-87 22:16:28 EDT
Article-I.D.: aw.2641
Posted: Sat Sep 26 22:16:28 1987
Date-Received: Sun, 27-Sep-87 12:04:50 EDT
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Keywords: Problem is linking

In article <582@uvm-gen.UUCP> haviland@uvm-gen.UUCP (Tom Haviland) writes:
>
>  I have an interesting problem I wonder if anyone out there might have
>experienced.  I'm writing a menu system to go with a fortran modelling
>package, and since supposedly microsoft C and FORTRAN work together, I
>wrote the menu system in C.  I've set up an INTERFACE block in the fortran
>program to call the C routines, and it seems to call the routine ok, but
>when the C routine calls the fscanf() function, reading floating point
>numbers from a file (%f) I get an error "Floating point not loaded" and
>the program stops.  Now the C routines do some floating point calculations
>	 					Thomas P. Haviland

Your problem isn't in the compiling -- its in the linking. If you link from
FORTRAN instead of from cc, the proper library for scanf/printf for floating
point numbers isn't linked. See page 367 of the C compiler user's guide
manual:

	"Your program needs the foating-point library, but the library was
	not loaded. The error causes the program to terminate with an exit
	status of 255."

You need to link in the C floating point library when you link. FORTRAN
won't know that you need the C floating point library. Hope this helps. It
is a common error when mixing languages. I ran into similar problems mixing
C and Ada because Ada didn't link in some startup code that the C code
needed, so I had to explicitly tell Ada to link in the C startup code.



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