UFC won't build with locally installed SWIG

[Garth Wells]

The SWIG extension won't build with SWIG installed locally but still in a user's path.

$ scons
scons: Reading SConscript files ...
Checking for SWIG...(cached) yes
Checking for SWIG version > 1.3.35...(cached) yes
Checking for Boost...(cached) yes
Checking for Python...(cached) yes
scons: done reading SConscript files.
scons: Building targets ...
swig -o src/ufc/ufc_wrap.cc -python -c++ -shadow -O src/ufc/ufc.i
c++ -o src/ufc/ufc_wrap.os -c -fPIC -I/usr/include -I/usr/include/python2.6 -Isrc/ufc src/ufc/ufc_wrap.cc
c++ -o src/ufc/_ufc.so -shared src/ufc/ufc_wrap.os
scons: done building targets.

$ sudo scons install
scons: Reading SConscript files ...
Checking for SWIG...(cached) no
scons: done reading SConscript files.
scons: Building targets ...
scons: `install' is up to date.
scons: done building targets.

*** Warning: swig not found.
Python extension module will not be installed.

[Garth Wells (garth-wells)]

I suspect this it due to Python being called by the root user when doing 'sudo scons install'. root does not known where the user installed UFC.

[Johannes Ring (johannr)]

When running a command using sudo the environment is completely different than what it is when running as a regular user. Therefore it is quite understandable that a locally installed SWIG is not found. I guess a possible solution is to add an option for setting the path to the SWIG executable, e.g. withSwig=/path/to/local/swig.

[Garth Wells (garth-wells)]

I think the problem is that 'scons install' wants to use SWIG, but it shouldn't. I first did

  $ scons

which should configure and build (and use SWIG). Then,

 $ sudo scons install

should just install the files.

[FEniCS JHBuildbot (jhbuildbot)]

Sorry, scons doesn't work like that. You don't even have to run it as a two step procedure (build and install), 'scons install' is enough.

[Garth Wells (garth-wells)]

Resolved with move to CMake.