Fable build issue - missing binary operator before token

[bdsmith0809]

Problem running the 'make' command described in the installation instructions.

Running in Ubuntu

`
fable/modules/boost/boost/thread/pthread/thread_data.hpp:60:5: error: missing binary operator before token "("
60 | #if PTHREAD_STACK_MIN > 0
| ^~~~~~~~~~~~~~~~~

++ -o boost/libs/timer/src/cpu_timer.o -c -I/home/brian/Projects/Python/fable/modules/boost -fPIC -fno-strict-aliasing -w -DNDEBUG -O3 -funroll-loops -DBOOST_ALL_NO_LIB -DBOOST_SYSTEM_NO_DEPRECATED=1 -DBOOST_TIMER_DYN_LINK=1 -I/home/brian/Projects/Python/fable/modules -I/home/brian/Projects/Python/fable/modules/cctbx_project /home/brian/Projects/Python/fable/modules/boost/libs/timer/src/cpu_timer.cpp
g++ -o boost_adaptbx/graph/breadth_first_search_ext.o -c -pthread -DBOOST_PYTHON_MAX_BASES=2 -I/home/brian/Projects/Python/fable/modules/boost -fPIC -fno-strict-aliasing -w -DNDEBUG -O3 -funroll-loops -DBOOST_ALL_NO_LIB -I/home/brian/Projects/Python/fable/modules/cctbx_project -I/home/brian/Projects/Python/fable/build36/include -I/home/brian/Projects/Python/fable/modules -I/home/brian/Projects/Python/fable/modules/cctbx_project -I/home/brian/Projects/Python/fable/build36/include -I/home/brian/miniconda2/envs/fable36/include/python3.6m /home/brian/Projects/Python/fable/modules/cctbx_project/boost_adaptbx/graph/breadth_first_search_ext.cpp
scons: *** [boost/libs/thread/src/pthread/thread.o] Error 1
scons: building terminated because of errors.
usr+sys time: 1.01 seconds
wall clock time: 48.93 seconds
make: *** [Makefile:6: default] Error 2

`

[bkpoon]

This is from the Boost source that is included in our source that is for older distributions of linux. If you are on Ubuntu 18 or later, you can delete the modules/boost directory before building. You should also delete your build directory before trying to build again because that might have some compiled Boost code.

[bdsmith0809]

Deleting the modules/boost folder caused the build to fail. Somewhere, something during the Make process is looking for boost python bindings. I had to install boost manually in the conda environment to get past that point.

Is there any sort of quick readme on how to use fable for Fortran files on a local machine? The automated tests are a good start, but there seems to be a lot of python programmatic magic going on, and it's hard to tell how one should start converting code of my choosing.

[bkpoon]

The basic command can be

fable.cout <fortan file 1> <fortan file 2> <additional fortran files> > <output cpp file>

You can add the --namespace flag to define the namespace for the C++ code.

As an example, you can try converting the LBFGS code in our scitbx/lbfgs directory by going into the cctbx_project directory of the repository and running

cd cctbx_project
fable.cout scitbx/lbfgs *.f > a.cpp

There are 2 Fortran files, one for the LBFGS code (lbfgs.f), and one for the driver (sdrive.f). You can convert them separately into different C++ files and then compile them together as well.

To compile, you will need some header files in cctbx_project, so in the compilation command, you will need -I flags to specify them.

g++ -I . -I ./fable a.cpp

The fable.cout --example will also show the full path for the -I flags.

You should get a.out which can be executed.