Enable pydoc to be built without library installed

This fixes some pathing issues with the sphinx doc that previously
required the library to be installed before sphinx doc could be
correctly built. This fixes #547

Signed-off-by: Travis F. Collins <travis.collins@analog.com>

Author: tfcollins

bindings/python/CMakeLists.txt

@@ -43,7 +43,8 @@ if(WITH_DOC)
 		${CMAKE_CURRENT_SOURCE_DIR}/doc/conf.py.in
 		${CMAKE_CURRENT_SOURCE_DIR}/doc/conf.py)
 	add_custom_command(TARGET libiio-py POST_BUILD
-		COMMAND ${SPHINX_EXECUTABLE}
+		COMMAND ${CMAKE_COMMAND} -E env "LD_LIBRARY_PATH=$ENV{LD_LIBRARY_PATH}:${CMAKE_BINARY_DIR}"
+		${SPHINX_EXECUTABLE}
 			-b html
 			-n
 			-c ${CMAKE_CURRENT_SOURCE_DIR}/doc

bindings/python/setup.py.cmakein

@@ -69,8 +69,8 @@ class InstallWrapper(install):
             destdir = os.getenv("DESTDIR", "")
             if destdir:
                 destdir = os.path.join("${CMAKE_BINARY_DIR}", destdir)
-                out = find_recursive(destdir, "libiio.so")
-                _lib = _cdll(out, use_errno=True, use_last_error=True)
+                fulllibpath = find_recursive(destdir, "libiio.so")
+                _lib = _cdll(fulllibpath, use_errno=True, use_last_error=True)
             else:
                 _lib = _cdll(find_library(_iiolib), use_errno=True, use_last_error=True)
             if not _lib._name: