Compiling error with FFTW installed via Homebrew

[mtrocadomoreira]

Hello!

I'm building HiPACE++ on a Mac desktop, and I got an error from cmake saying it couldn't find the fftw3 package. I found a solution, which is described below. I initially installed all the packages with Homebrew, and my interpretation is that fftw is not installed/linked properly using Homebrew, so I compiled the package manually for different precisions (not sure if that's necessary, but it worked anyway).

Not sure whether this counts as an issue, but I just wanted to share the solution I found in case someone has the same problem. Maybe a note about this could be included in the Homebrew section of the installation guide?

Details

• default build options

• Intel processor with integrated GPU unit

• FFTW version on Homebrew: 3.3.10

• Homebrew version: 4.1.15

• MacOS version: Ventura 13.5.2

• error after running cmake -S . -B build:

  ...
  -- Checking for module 'fftw3'
  --   No package 'fftw3' found
  CMake Error at /usr/local/Cellar/cmake/3.27.7/share/cmake/Modules/FindPkgConfig.cmake:607 (message):
    A required package was not found
  Call Stack (most recent call first):
    /usr/local/Cellar/cmake/3.27.7/share/cmake/Modules/FindPkgConfig.cmake:829 (_pkg_check_modules_internal)
    cmake/dependencies/FFT.cmake:92 (pkg_check_modules)
    CMakeLists.txt:114 (include)
  ...
  

Solution

Adapted from this solution to a similar issue.

1. In Terminal, go to directory where FFTW package should be installed.
2. Run the following commands:
   (note that I had to use sudo for the make and rm commands, but this might be unnecessary in your case)

   FFTW_VERSION=3.3.10
   curl -L http://www.fftw.org/fftw-$FFTW_VERSION.tar.gz | tar xz
   mkdir fftw-$FFTW_VERSION/build && cd $_
   cmake -DBUILD_SHARED_LIBS=OFF -DENABLE_OPENMP=ON -DENABLE_THREADS=ON -DENABLE_LONG_DOUBLE=ON ../../fftw-${FFTW_VERSION}
   sudo make -j $(nproc) install
   sudo rm -r *
   cmake -DBUILD_SHARED_LIBS=OFF -DENABLE_OPENMP=ON -DENABLE_THREADS=ON -DENABLE_FLOAT=ON -DENABLE_SSE=ON -DENABLE_SSE2=ON -DENABLE_AVX=ON -DENABLE_AVX2=ON ../../fftw-${FFTW_VERSION}
   sudo make -j $(nproc) install
   sudo rm -r *
   cmake -DBUILD_SHARED_LIBS=OFF -DENABLE_OPENMP=ON -DENABLE_THREADS=ON -DENABLE_SSE=ON -DENABLE_SSE2=ON -DENABLE_AVX=ON -DENABLE_AVX2=ON ../../fftw-${FFTW_VERSION}
   sudo make -j $(nproc) install