Hi Glenn, On Tue, Mar 30, 2010 at 11:15:27AM -0400, Glenn H Sembroski wrote: > I have a problem trying to prepare a large simulation package, using > mixed F90 and C++ routines, to compile and build under GCC (g++, and > gfortran). The problem is I have a C++ function: Gauss() which is > called from an F90 routine: > x=gauss() > > This package was made able to build under the Intel fortran compiler by > adding to the fortran file the Intel compile directive: > > !DEC$ ATTRIBUTES ALIAS:'Gauss' :: gauss > > I attempted to build this program using GCC where for F90 code the > gfortran compiler option -fno-underscoring was used. > > Presently my fortran routine won't build. It gets the error: > > 485: undefined reference to `gauss' > > So, my question is, is there a way in GCC to enable the linker to find > the C++ 'Gauss' method? Well, just a possibility: C++-functions are something special (due to the possibility that they can be overloaded e.g.), you can't call them directly from C or F77 - and I think F90 might have the same problem: A C++-Function "Gauss" will NOT be called "gauss" for linking - but instead it will have a much longer name depending on its parameters... You have to mark the C++-function as e.g. extern "C" void Gauss(); in order to be able to call it from C or F77 (and probably also for calls from F90?) Axel
