Build & Install

./configure
make
make install

To list options, use ./confiture --help.

FFTW 3 defaults to double precision. Use --enable-float or --enable-single to enable single precision.

Enable x86 and x64 SIMD.

--enable-sse --enable-sse2 --enable-avx --enable-avx2 --enable-avx512 --enable-avx-128-fma

More SIMD and fma instruction. --enable-generic-simd* options compiles to different code path.

--enable-generic-simd128 --enable-generic-simd256 --enable-fma

Disable fortran.

--disable-fortran

Set install location.

--prefix=/home/cu/code/cpp/fftCompare/install

`./configure`

Linux.

./configure --with-pic=yes --enable-single --enable-sse2 --enable-avx --enable-avx2 --enable-avx512 --enable-avx-128-fma --enable-fma --disable-fortran --prefix=/home/cu/code/cpp/fftCompare/install

Windows build

MSVC

CMake can be used.

cd fftw-<version>

mkdir build
cd build

cmake ..
cmake-gui.exe .
cmake --build . --config release

To build static library, turn off BUILD_SHARED_LIBS.

Library is built in build/Release directory. Header is at api/fftw3.h.

mingw - Build FFTW lib with Visual Studio 2015 [added: steps for VS 2019] - Stack Overflow

MSYS2

I wasn't able to use MSYS2 static build (libfftw3.a etc.) with MSVC.

There's also a package available on MSYS2.

Package: mingw-w64-x86_64-fftw - MSYS2 Packages

./configure options.

mkdir build
cd build

# Single thread.
../configure --host=x86_64-w64-mingw32 --disable-alloca --with-our-malloc --enable-single --enable-sse2 --enable-avx --enable-avx2 --enable-fma --enable-avx-128-fma --disable-fortran --prefix="$HOME/code/fft/install" && make -j && make install

# With multi-threading.
../configure --host=x86_64-w64-mingw32 --disable-alloca --with-our-malloc --enable-single --enable-sse2 --enable-avx --enable-avx2 --enable-fma --enable-avx-128-fma --disable-fortran --enable-threads --prefix="$HOME/code/fft/install" && make -j

for lib in *.a; do echo $lib; ar -t $lib | grep gettime; done > result

libgcc.a
libmingw32.a
libmingwex.a
And more.

Still missing library for fprintf and __getreent. Also libmingw32.a contains a symbol that conflicts with MSVCRT.lib.

libmingw32.a(lib64_libmingw32_a-tlssup.o) : warning LNK4078: multiple '.CRT' sections found with different attributes (
C0400040) [C:\Users\Golwond\code\vst\Plugins\build\CubicPadSynth\CubicPadSynth.vcxproj]
MSVCRT.lib(gs_report.obj) : error LNK2005: __report_gsfailure already defined in libmingw32.a(lib64_libmingw32_a-gs_sup
port.o) [C:\Users\Golwond\code\vst\Plugins\build\CubicPadSynth\CubicPadSynth.vcxproj]

libfftw3f.a(assert.o) : error LNK2019: unresolved external symbol __getreent referenced in function fftwf_assertion_fai
led [C:\Users\Golwond\code\vst\Plugins\build\CubicPadSynth\CubicPadSynth.vcxproj]
libfftw3f.a(assert.o) : error LNK2019: unresolved external symbol fprintf referenced in function fftwf_assertion_failed
 [C:\Users\Golwond\code\vst\Plugins\build\CubicPadSynth\CubicPadSynth.vcxproj]
C:\Users\Golwond\code\vst\vst3sdk\build\VST3\Release\CubicPadSynth.vst3\Contents\x86_64-win\CubicPadSynth.vst3 : fatal
error LNK1120: 2 unresolved externals [C:\Users\Golwond\code\vst\Plugins\build\CubicPadSynth\CubicPadSynth.vcxproj]

File location

Following 2 files are necessary.

.libs/libfftw3.a
api/fftw3.h

Benchmark

Linking

When linking with g++ (or clang++), order of options is important.

g++ -O3 main.cpp -lm libfftw3f.a   # Correct.
# g++ -O3 -lm libfftw3f.a main.cpp # Incorrect. Link fails.

Reference

./configure recipe.

homebrew-core/fftw.rb at master · Homebrew/homebrew-core · GitHub

Runtime SIMD detection.

ryukau/fftw3build