Build/install on Ubuntu 20.04

[paugier]

I try to build p3dfft on Ubuntu 20.04.

On Debian based systems, the fftw libs are in /usr/lib/x86_64-linux-gnu so it does not to just use --with-fftw=/usr.

I copied the headers and the libraries in a special directory to please p3dfft:

mkdir -p $HOME/opt/fftw/include/
mkdir -p $HOME/opt/fftw/lib/
cp /usr/include/fftw* $HOME/opt/fftw/include
cp /usr/lib/x86_64-linux-gnu/libfftw3* $HOME/opt/fftw/lib

Then, this configure command seems to work fine:

./configure --prefix=$HOME --enable-fftw --enable-openmpi --enable-gnu --with-fftw=$HOME/opt/fftw  CC=mpicc CCLD=mpif90

However, the make command fails:

$ make                                                                                                                    
 cd . && automake-1.13 --gnu --ignore-deps
/bin/bash: line 4: automake-1.13: command not found
make: *** [Makefile:341: Makefile.in] Error 1

So I tried to run:

libtoolize
aclocal -I . && autoheader && autoconf && automake --add-missing -c

Finally, make starts to compile something but finally, I get

/usr/bin/ld: /home/pierre/opt/fftw/lib/libfftw3.a(mapflags.o): undefined reference to symbol 'log@@GLIBC_2.29'
/usr/bin/ld: /lib/x86_64-linux-gnu/libm.so.6: error adding symbols: DSO missing from command line

From this point, I don't know what to do... Help would be greatly appreciated to compile p3dfft on Ubuntu 20.04.

[bkmgit]

Have you tried building FFTW yourself?

[bkmgit]

The following worked for me:

 ./configure --enable-gnu --enable-fftw --enable-openmpi --with-fftw=$HOME/fftw-3.3.10-install FC=mpif90 CC=mpicc LDFLAGS=-L/lib/x86_64-linux-gnu LIBS=-lm --prefix=$HOME/p3dfft-install

[bkmgit]

This is using commit b9d9528 - head of the repository at present.

[bkmgit]

Building FFTW

wget http://fftw.org/fftw-3.3.10.tar.gz
tar -xf fftw-3.3.10.tar.gz 
cd fftw-3.3.10/
./configure --prefix=$HOME/fftw-3.3.10-install
make -j2
make install
 ./configure --prefix=$HOME/fftw-3.3.10-install --enable-shared
make -j2
make install
cd ..

[paugier]

Thanks @bkmgit. It works for me with your configure command (even without building fftw).

It would be nice to have the install procedure for Ubuntu/Debian systems written somewhere.

I don't know if we could be possible to install without libtool, autoconf, automake ?

[bkmgit]

@paugier Great. For many projects, configure script is part of releases, but not part of the Git sources, though possibly the configure script and dependencies used to generate it could be updated to resolve #13

[bkmgit]

One can update the documentation at:

• https://github.com/sdsc/p3dfft/wiki/install
• https://p3dfft.readthedocs.io/en/latest/install_p3dfft.html
  Allowing FFTW to have separate locations for header files and the library may be helpful. Maybe this thread is sufficient until the configure script is updated? Also note on Arm systems running Debian/Ubuntu, the location will change a little.