Compile position independent folly library

-fPIC is passed to the compiler on generation of objects, to compile
both with and without PIC (Position Independent Code), a second lib is
required.

CMakeLists.txt

@@ -224,6 +224,14 @@ add_library(folly
 )
 apply_folly_compile_options_to_target(folly)
 
+add_library(folly_pic
+  ${files} ${hfiles}
+  ${CMAKE_CURRENT_BINARY_DIR}/folly/folly-config.h
+)
+apply_folly_compile_options_to_target(folly_pic)
+set_target_properties(folly_pic PROPERTIES POSITION_INDEPENDENT_CODE True)
+
+
 target_link_libraries(folly PUBLIC folly_deps)
 
 install(TARGETS folly folly_deps

folly/CMakeLists.txt

@@ -35,6 +35,7 @@ if (CYTHON_FOUND AND PYTHONINTERP_FOUND)
 
   add_custom_target(folly_python_bindings ALL
     COMMAND python3 ${CMAKE_CURRENT_SOURCE_DIR}/setup.py build_ext -f
+    DEPENDS folly_pic
     WORKING_DIRECTORY ${_cybld})
 
   # Install Folly Python Bindings

folly/setup.py

@@ -15,7 +15,8 @@
 ext = Extension("folly.executor",
                 sources=['folly/executor.pyx'],
    include_dirs=[os.getcwd()+"/..", os.getcwd()],
-   libraries=['folly', 'glog', 'double-conversion', 'iberty'])
+   libraries=['folly_pic', 'glog', 'double-conversion', 'iberty'],
+   library_dirs=[os.getcwd()+"/../.."])
 
 setup(name="folly",
       version='0.0.1',