Add libolm as dependency

CMakeLists.txt

@@ -5,6 +5,7 @@ project(matrix_client CXX)
 option(BUILD_LIB_TESTS "Build tests" ON)
 option(BUILD_LIB_EXAMPLES "Build examples" ON)
 
+set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake)
 set(CMAKE_INCLUDE_CURRENT_DIR ON)
 
 if(CMAKE_CXX_COMPILER_ID MATCHES "Clang" OR CMAKE_CXX_COMPILER_ID MATCHES "GNU")
@@ -53,7 +54,7 @@ find_package(Boost 1.66 COMPONENTS system random thread)
 
 if(NOT Boost_FOUND)
     message(STATUS "Fetching and building Boost 1.66")
-    include(${CMAKE_SOURCE_DIR}/cmake/Boost.cmake)
+    include(Boost)
 endif()
 
 include_directories(${Boost_INCLUDE_DIRS})
@@ -61,15 +62,20 @@ include_directories(${Boost_INCLUDE_DIRS})
 #
 # matrix-structs
 #
-include(${CMAKE_SOURCE_DIR}/cmake/MatrixStructs.cmake)
+include(MatrixStructs)
+
+#
+# libolm
+#
+include(Olm)
 
 include_directories(src)
 include_directories(${MATRIX_STRUCTS_INCLUDE_DIRS})
 set(SRC src/client.cpp src/utils.cpp)
 
 add_library(matrix_client ${SRC})
-add_dependencies(matrix_client MatrixStructs)
-target_link_libraries(matrix_client matrix_structs ${Boost_LIBRARIES} ${OPENSSL_LIBRARIES})
+add_dependencies(matrix_client MatrixStructs Olm)
+target_link_libraries(matrix_client matrix_structs olm ${Boost_LIBRARIES} ${OPENSSL_LIBRARIES})
 
 if(NOT Boost_FOUND)
     add_dependencies(matrix_client Boost)

cmake/Olm.cmake

+include(ExternalProject)
+
+#
+# Build & install olm.
+#
+
+set(THIRD_PARTY_ROOT ${CMAKE_SOURCE_DIR}/.third-party)
+set(OLM_ROOT ${THIRD_PARTY_ROOT}/olm)
+
+ExternalProject_Add(
+  Olm
+
+  GIT_REPOSITORY https://git.matrix.org/git/olm.git
+  GIT_TAG 3f5b9dd6d72540a66da90b382a2eda088af63da0
+
+  BUILD_IN_SOURCE 1
+  SOURCE_DIR ${OLM_ROOT}
+  CONFIGURE_COMMAND ""
+  BUILD_COMMAND make static
+  INSTALL_COMMAND ""
+)
+
+include_directories(SYSTEM ${OLM_ROOT}/include ${OLM_ROOT}/include/olm)
+link_directories(${OLM_ROOT}/build)