LNK2001

[Deleted_U_Intel]

I am trying to write a simple dll file which calls a routine from Nag's Fortran Library mark 17. Unfortunately I am not meeting with much success. My code is as follows:

DOUBLE PRECISION FUNCTION TEST(X)
! Expose subroutine nagdll to users of this DLL
!
!DEC$ ATTRIBUTES DLLEXPORT::TEST
* .. Local Scalars ..
DOUBLE PRECISION X
* .. External Functions ..
DOUBLE PRECISION G05CAF
EXTERNAL G05CAF
* .. External Subroutines ..required to initialize Function
EXTERNAL G05CBF
* .. Executable Statements ..
CALL G05CBF(3)
*
TEST = G05CAF(X)
*
*
END

The idea here is just to confirm that this can be done. The code compiles
fine but the build stage returns the following errors:

NAGLIB.LIB(x02ajft.obj) : error LNK2001: unresolved external symbol __FFljj
NAGLIB.LIB(g05cbft.obj) : error LNK2001: unresolved external symbol __FFljj
NAGLIB.LIB(g05caft.obj) : error LNK2001: unresolved external symbol __FFljj
NAGLIB.LIB(g05cazt.obj) : error LNK2001: unresolved external symbol __FFljj
NAGLIB.LIB(g05cayt.obj) : error LNK2001: unresolved external symbol __FFljj
Debug/nagdll.dll : fatal error LNK1120: 1 unresolved externals

If I append a little main program which calls the function and compile it as
a console application then everything works fine and it builds and runs as
expected. I've played about with this for a while trying to follow some
suggestions from the help but I haven't met with any success. I suspect it
is a simple enough option change or a missing line of code or two and would appreciate any help in informing me of what action to take.

Thanks,
Don.

[Jugoslav_Dujic]

It seems that the error you get has little or nothing to do with your code. LNK2001s you get indicate that Naglib.lib links to missing imports. Now, I don't know anything about that library; however, you should check "Link/Object-library modules" on project settings to ensure that all necessary libraries are there. Possibly these settings differ for the dll in question and console app you mention.

Jugoslav

[Intel_C_Intel]

Thanks for your help guys. I sorted the problem out by just arbitrarily varying the options. The library was correctly referenced in the linker options so I didn't need to change that. What I did change were the options in the Fortran/Libraries/Fortran Libraries section to the following:

I ticked Use Multi Threaded Library
Reentrancy Support: Threaded
Use Run-time libraries: Static*

This did the job. Thanks again for the help....it was the comparison of options between the console project and the dll project that set me off.

Don.