在 windows 上使用 cmake 编译 FFTW (OpenMP)

Question

I am trying to install FFTW with cmake on my windows machine. I downloaded the latest version of the source files and ran cmake with these options first:

mkdir build && cd build
cmake --DBUILD_TESTS=False -DENABLE_FLOAT=On ..
cmake --build . --config Release

That works just fine on both Visual Studio 2017 and 2019. However, when I tried to compile the code with OpenMP,

cmake --DBUILD_TESTS=False -DENABLE_FLOAT=On -DENABLE_OPENMP=On ..
cmake --build . --config Release

I get a whole bunch of linking errors:

[...]
ct.obj : error LNK2001: unresolved external symbol fftwf_ops_zero [C:\Users\jha1\Desktop\fftw-3.3.8.tar\fftw-3.3.8\build\fftw3f_omp.vcxproj]
dft-vrank-geq1.obj : error LNK2001: unresolved external symbol fftwf_ops_zero [C:\Users\jha1\Desktop\fftw-3.3.8.tar\fftw-3.3.8\build\fftw3f_omp.vcxproj]
hc2hc.obj : error LNK2001: unresolved external symbol fftwf_ops_zero [C:\Users\jha1\Desktop\fftw-3.3.8.tar\fftw-3.3.8\build\fftw3f_omp.vcxproj]
[...]

However, it looks like cmake was able to find OpenMP during the configuration phase, so I am not sure what is causing this issue.

[...]
-- Found OpenMP_C: -openmp (found version "2.0")
-- Found OpenMP_CXX: -openmp (found version "2.0")
-- Found OpenMP: TRUE (found version "2.0")
[...]

Note that this worked just fine on my linux machine with gcc 9.

Answer 1

I'm able to build fftw-3.3.8 in different versions using configure in MSYS2 using MinGW-W64 (version from http://winlibs.com ) like this:

INSTALLPREFIX=/usr/local
BUILDPLATFORM=i686-w64-mingw32
RUNPLATFORM=i686-w64-mingw32
BUILDPLATFORM=x86_64-w64-mingw32
RUNPLATFORM=x86_64-w64-mingw32
mkdir -p build_single build_longdouble build_quad build_standard &&
cd build_single &&
#../configure --prefix=$INSTALLPREFIX --build=$BUILDPLATFORM --host=$RUNPLATFORM --enable-shared --enable-static --with-our-malloc16 --enable-threads --with-combined-threads --enable-portable-binary --enable-sse2 LDFLAGS="-Wl,--enable-auto-import" &&
#../configure --prefix=$INSTALLPREFIX --build=$BUILDPLATFORM --host=$RUNPLATFORM --enable-shared --enable-static --disable-alloca --with-our-malloc16 --enable-threads --with-combined-threads --enable-single --enable-sse --enable-sse2 --enable-avx LDFLAGS="-Wl,--enable-auto-import" &&
../configure --cache-file=../config.cache --prefix=$INSTALLPREFIX --build=$BUILDPLATFORM --host=$RUNPLATFORM --enable-shared --enable-static --disable-alloca --with-our-malloc16 --enable-threads --with-combined-threads --enable-single --enable-sse --enable-sse2 --enable-avx LDFLAGS="-Wl,--enable-auto-import" &&
cd .. &&
cd build_longdouble &&
#../configure --prefix=$INSTALLPREFIX --build=$BUILDPLATFORM --host=$RUNPLATFORM --enable-shared --enable-static --disable-alloca --with-our-malloc16 --enable-threads --with-combined-threads --enable-long-double LDFLAGS="-Wl,--enable-auto-import" &&
../configure --cache-file=../config.cache --prefix=$INSTALLPREFIX --build=$BUILDPLATFORM --host=$RUNPLATFORM --enable-shared --enable-static --disable-alloca --with-our-malloc16 --enable-threads --with-combined-threads --enable-long-double LDFLAGS="-Wl,--enable-auto-import" &&
cd .. &&
#cd build_quad &&
##../configure --prefix=$INSTALLPREFIX --build=$BUILDPLATFORM --host=$RUNPLATFORM --enable-shared --enable-static --disable-alloca --with-our-malloc16 --enable-threads --with-combined-threads --enable-quad-precision LDFLAGS="-Wl,--enable-auto-import" &&
#../configure --cache-file=../config.cache --prefix=$INSTALLPREFIX --build=$BUILDPLATFORM --host=$RUNPLATFORM --enable-shared --enable-static --disable-alloca --with-our-malloc16 --enable-threads --with-combined-threads --enable-quad-precision LDFLAGS="-Wl,--enable-auto-import" &&
## fix building DLLs
#mv libtool libtool.bak &&
#sed -e "s/\(allow_undefined=\)yes/\1no/" libtool.bak > libtool &&
#cd .. &&
cd build_standard &&
#../configure --prefix=$INSTALLPREFIX --build=$BUILDPLATFORM --host=$RUNPLATFORM --enable-shared --enable-static --disable-alloca --with-our-malloc16 --enable-threads --with-combined-threads --enable-sse2 --enable-avx LDFLAGS="-Wl,--enable-auto-import" &&
../configure --cache-file=../config.cache --prefix=$INSTALLPREFIX --build=$BUILDPLATFORM --host=$RUNPLATFORM --enable-shared --enable-static --disable-alloca --with-our-malloc16 --enable-threads --with-combined-threads --enable-sse2 --enable-avx LDFLAGS="-Wl,--enable-auto-import" &&
cd .. &&
( make -Cbuild_single || make -Cbuild_single LIBS="-lpthread" ) &&
make -Cbuild_single install-strip &&
( make -Cbuild_longdouble || make -Cbuild_longdouble LIBS="-lpthread" ) &&
make -Cbuild_longdouble install-strip &&
#( make -Cbuild_quad || make -Cbuild_quad LIBS="-lpthread" ) &&
#make -Cbuild_quad install-strip &&
( make -Cbuild_standard || make -Cbuild_standard LIBS="-lpthread" ) &&
make -Cbuild_standard install-strip &&
# fix absolute link in .cmake file(s)
sed -i -e "s?$(echo $INSTALLPREFIX|sed -e "s?^/\([a-zA-Z]\)/?\1:/?")?\${CMAKE_CURRENT_LIST_FILE}/../../../..?g" $INSTALLPREFIX/lib/cmake/fftw3/*Config.cmake &&
echo Done

If you don't want all these versions you can just stick to the lines relating to build_standard .

There were no OpenMP issues building like this.