HAMLIB SDK Version 3 Evolving the JT-ware Software Developer's Kit (JTSDK)

Guide for Building FFTW

Step 1: Download and fully deploy the Latest JTSDK

• Version 3.4.1 can be found at:
• https://sourceforge.net/projects/hamlib-sdk/files/Windows/JTSDK-3.4-Stream/

Step 2: Deploy the Build Tools and Libraries

This stage involves deploying tools as if one were building Hamlib. Many required MSYS2 tools are deployed as part of this process.

Note that FFTW may require the POSIX low-level IO libraries and tools. These should be deployed first.

• Execute the following command inside the JTSDK-Tools environment:
• msys2
• Execute the following commands inside the MSYS2 environment:
• pacman -S msys2-runtime-devel mingw-w64-cross-binutils (see https://groups.io/g/JTSDK/topic/knowledgebase_ioctl_h/85578130 )
• menu
• Select the following options from the menu:
• Select Option 2 to update the MSYS2 environment. If the environment requests that you close the window after completion then do so. Restart this section again.
• Select Option 3. Install Hamlib dependencies.
• Select Option 4. Install msys64 GNU Compilers.

This should have now downloaded the build environment for MSYS2 – providing a POSIX-compliant environment in which FFTW libraries should be built.

• Close all MSYS2 and JTSDK-Tools environment Windows

Step 3: Deploy the MSYS2 Build Environment with Qt Compilers

The build environment must be set up so that the FFTW source can use the Qt-supplied GCC compilers.

• Launch the JTSDK64-Tools environment
• Inside the JTSDK64-Tools environment type:
• msys2

Now we need to tell the MSYS2 environment HOW to find the Qt-delivered compilers..

• Inside the JTSDK64-Tools environment type:
• menu
• Select 1. Set MSYS2 path to find Qt compilers.

The build environment should now be configured for building FFTW but using the Qt-supplied GCC compilers. This ensures that Qt-specific facilities are picked up as part of the FFTW library compilation process.

Step 4: Download the Source

Determine the download URL of the latest stable FFTW release by browsing to http://www.fftw.org/download.html .

• Right-click on the URL of the download file that you want and select “Copy Link”
• i.e.: the URL is http://www.fftw.org/fftw-3.3.10.tar.gz
• Type the following command:
• cd ~/src
• In the MSYS2 shell, type wget, paste the URL, and then press enter. i.e.
• wget http://www.fftw.org/fftw-3.3.10.tar.gz

This downloads the source package.

• Extract the source package with:
• tar xvfz fftw-3.3.10.tar.gz

Step 5: Drop in a special build helper file

A script BUILD-MINGW64.sh from http://www.fftw.org/install/windows.html needs to be dropped into into the source directory to assist with the Windows build of FFTW. If you are developing from a mingw32 environment then there is a 32-bit script needed.   

• Execute the following commands at the MSYS2 terminal prompt:
• cd ~/src/fftw-3.3.10
• wget https://fftw.org/pub/fftw/BUILD-MINGW64.sh [ or wget https://fftw.org/pub/fftw/BUILD-MINGW32.sh ]
• Note: If you are using mingw32.exe then slight modifications to BUILD-MINGW32.sh may be needed as some tool nomenclature may have changed since the script was originally written i.e. i686-w64-mingw32-nm is now just nm .

Step 6: Configure and build the FFTW libraries

Now we need to build the actual library

• Execute the following commands at the MSYS2 command prompt:
• cd fftw-3.3.10
• ./BUILD-MINGW64.sh [ or ./BUILD-MINGW32.sh ]

The above command places a .ZIP file containing the built FFTW 3.3.10 libraries in the source directory.

Complete

You will find a .ZIP file (i.e. fftw-3.3.10-dll64.zip) inside the MSYS2 build directory; ~/src/fftw-3.3.10 (Windows path C:\JTSDK64-Tools\tools\msys64\home\\src\fftw-3.3.10) that contains the latest built FFTW.

You will need to open that ZIP file and extract its contents to a folder 3.3.10 under C:\JTSDK64-Tools\tools\ffts before it can be used with the JTSDK.

Make the appropriate adjustment in C:\JTSDK64-Tools\config\Versions.ini so that it can be used by the JTSDK (i.e. set fftwv=3.3.10 ).

References

• http://www.fftw.org/install/windows.html
• https://groups.io/g/JTSDK/topic/knowledgebase_ioctl_h/85578130