Building Your Own Wrapper Library

The FFTW3 wrappers to Intel MKL are delivered both integrated in Intel MKL and as source code, which can be compiled to build a standalone wrapper library with exactly the same functionality. Normally you do not need to build the wrappers yourself. However, if your Fortran application is compiled with a compiler that uses a different name decoration than the Intel® Fortran compiler or if you are using compiler options altering the Fortran name decoration, you may need to build the wrappers that use the appropriate name changing convention.

The source code for the wrappers, makefiles, and function list files are located in subdirectories .\interfaces\fftw3xc and .\interfaces\fftw3xf in the Intel MKL directory for C and Fortran wrappers, respectively.

To build the wrappers,

Change the current directory to the wrapper directory
Run the make command on Linux* OS and Mac OS* X or the nmake command on Windows* OS with a required target and optionally several parameters.

The target, that is, one of {libia32, libintel64}, defines the platform architecture, and the other parameters facilitate selection of the compiler, size of the default INTEGER type, and placement of the resulting wrapper library. You can find a detailed and up-to-date description of the parameters in the makefile.

In the following example, the make command is used to build the FFTW3 Fortran wrappers to MKL for use from the GNU g77 Fortran compiler on Linux OS based on Intel® 64 architecture:

cd interfaces/fftw3xf
make libintel64 compiler=gnu fname=a_name__ install_to=/my/path

This command builds the wrapper library using the GNU gcc compiler, decorates the name with the second underscore, and places the result, named libfftw3xf_gcc.a, into directory /my/path. The name of the resulting library is composed of the name of the compiler used and may be changed by an optional parameter.