Link Problem between Ifort compiled program and g++

sphost — Mon, 07 Jul 2008 14:50:08 GMT

Hi,

I work on a C++ project and we have to integrate some mathematical Model written in Fortran.

I compiled this Model with ifort and made an .a file.

I tried to call this model in my C++ code but during the linkof the .a library with g++ an error occured "Undefined reference to" my Fortran function.

Do I have to put specific option with ifort and g++in order to able to link correctly ?

Thanks in advance for your answers.

Sample code test below :

Fortran Code :

subroutine F1(B, D, TAILLE_D) BIND(C, NAME="f1")
use, intrinsic :: ISO_C_BINDING
implicit none
real(C_DOUBLE), intent(inout) :: B
real(C_DOUBLE), dimension(*), intent(in) :: D
integer(kind=C_LONG), VALUE :: TAILLE_D
print *, "B=", B, "D(",TAILLE_D,")=", D(TAILLE_D)
end subroutine F1
C++ Code
void f1( double *b, double d[], long taille_d );
main()
{
double beta = 378.0 ;
double delta[] = { 17., 12.3, 3.14, 2.718, 0.56,
22.67, 25.8, 89., 76.5, 80. } ;
long taille_delta = sizeof delta / sizeof delta[0] ;
f1( β, delta, taille_delta ) ;
return 0;
}
With this test, I obtain : "Undefined reference to `f1(double*, double*, long)"

Re: Link Problem between Ifort compiled program and g++

Steven_L_Intel1 — Mon, 07 Jul 2008 15:22:59 GMT

In your C++ code, you need to write:

extern "C" void f1 (....)

Otherwise C++ name mangling is applied.

Re: Link Problem between Ifort compiled program and g++

sphost — Tue, 08 Jul 2008 13:09:18 GMT

Thanks for your help.

After that others linking problems occur but I manage to solve it when I link the library ifcore and dl.

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