Developer Reference


Building Your Own FFTW3 Interface 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.
The source code for the wrappers, makefiles, and files with lists of functions are located in the
subdirectory in the
Intel® MKL
To build the wrappers,
  1. Change the current directory to the wrapper directory
  2. Run the
    command on Linux* OS and macOS* or the
    command on Windows* OS with a required target and optionally several parameters.
The target
defines the platform architecture, and the other parameters specify 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
command is used to build the FFTW3 C wrappers to
Intel® MKL
for use from the GNU gcc* compiler on Linux OS based on Intel® 64 architecture:
cd interfaces/fftw3xc make libintel64 compiler=gnu INSTALL_DIR=/my/path  
This command builds the wrapper library and places the result, named
, into the
directory. The name of the resulting library is composed of the name of the compiler used and may be changed by an optional parameter

Product and Performance Information


Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804