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Installing the FFTW3 library on Windows 10 using Code::Blocks (C++)

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gd_on:
Your process certainly works, but it's rather complicated. As you still use the dll, it's not necessary to create with dlltool an interface library .a. Here, the .a file, created by dlltool is not a static library (though the extension is the same). Nevertheless, MinGW can work without this interface file.
You can use directly the dll in linker setting by entering the name libfftw3-3 without any extension and giving the path to this dll in the settings too (For me, a relative path has been OK). MinGW use the dll in that case. You can choose to place the dll (or a copy) in your bin subfolder, where the executable is created or put the dll in a subfolder that your PATH variable knows.

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