Do not compile Boost when not needed

Author: Roberto Di Remigio

cmake/autocmake.cfg

@@ -48,7 +48,7 @@ source: https://github.com/scisoft/autocmake/raw/master/modules/python_interpret
 source: custom/pcmsolver.cmake
 
 [boost]
-override: {'major': 1, 'minor': 54, 'patch': 0, 'components': 'chrono;timer;system'}
+override: {'major': 1, 'minor': 54, 'patch': 0}
 source: https://github.com/scisoft/autocmake/raw/master/modules/boost/boost.cmake
 
 [general]

cmake/custom/pcmsolver.cmake

@@ -10,7 +10,9 @@ if(NOT DEFINED SUBMODULES_INSTALL_PREFIX)
 endif()
 
 set(BOOST_MINIMUM_REQUIRED 1.54.0)
-set(BOOST_COMPONENTS_REQUIRED "chrono;timer;system")
+if(BUILD_STANDALONE OR ENABLE_TIMER)
+  set(BOOST_COMPONENTS_REQUIRED "chrono;timer;system")
+endif()
 
 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/lib)
 set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/lib)

setup.py

@@ -64,7 +64,7 @@ def gen_cmake_command(options, arguments):
     command.append('-DBOOST_LIBRARYDIR="{0}"'.format(arguments['--boost-libraries']))
     command.append('-DFORCE_CUSTOM_BOOST="{0}"'.format(arguments['--build-boost']))
     command.append('-DBOOST_MINIMUM_REQUIRED="1.54.0"')
-    command.append('-DBOOST_COMPONENTS_REQUIRED="chrono;timer;system"')
+    command.append('-DBOOST_COMPONENTS_REQUIRED="''"')
     command.append('-DCMAKE_BUILD_TYPE=%s' % arguments['--type'])
     command.append('-G "%s"' % arguments['--generator'])
     if arguments['--cmake-options'] != "''":