Merge pull request #12 from RasmusRendal/master

Add support for using system version of libraries

CMakeLists.txt

@@ -22,20 +22,23 @@ set(EXTERNAL_INSTALL_LOCATION ${CMAKE_BINARY_DIR}/external)
 option(STRATEGY_GetDependencies "Fetch external dependencies from web." ON)
 
 if (STRATEGY_GetDependencies)
-    ExternalProject_add(ptrie-ext
+    ExternalProject_add(ptrie
         URL https://github.com/petergjoel/ptrie/archive/v1.1.1.zip
         URL_HASH SHA512=5435D6F8132D273B50ECCD721790D559F7DC67FFDADA75FEC315F4C53705199F31F1DDC80DDA0CB86F883DB27076FA6D324D28516B442FECCE3FFA51213AEF4E
         CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${EXTERNAL_INSTALL_LOCATION} -DBUILD_TESTING=OFF -DCMAKE_BUILD_TYPE=Release
     )
 
-    ExternalProject_add(json-ext
+    ExternalProject_add(nlohmann_json
         URL https://github.com/nlohmann/json/archive/v3.7.3.zip
         URL_HASH SHA512=b47a07de9a071cce645a173d084df5dd31f7669154fc00f6c99e0506474d30e8376acaee1d3c79a50def4f25a36042951bfa4fca9a704687e59c368d05053158
 	CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${EXTERNAL_INSTALL_LOCATION} -DJSON_BuildTests=OFF -DCMAKE_TOOLCHAIN_FILE=${CMAKE_TOOLCHAIN_FILE}
     )
 
     include_directories(${EXTERNAL_INSTALL_LOCATION}/include)
     link_directories(${EXTERNAL_INSTALL_LOCATION}/lib)
+else (STRATEGY_GetDependencies)
+	find_package(nlohmann_json 3.7.3 REQUIRED)
+	find_package(ptrie 1.1.1 REQUIRED)
 endif (STRATEGY_GetDependencies)
 
 # Unset Boost_ROOT here if set, not needed for JSON or source of strategy

src/CMakeLists.txt

@@ -13,17 +13,23 @@ if(NOT LIBSTRATEGY_OnlyLibrary)
 endif()
 
 add_library(strategy SHARED ${HEADER_FILES} libz2s.cpp ZonotopStrategy.cpp SimpleTree.cpp)
-add_dependencies(strategy ptrie-ext json-ext)
+if (STRATEGY_GetDependencies)
+	add_dependencies(strategy ptrie json)
+endif (STRATEGY_GetDependencies)
 target_include_directories (strategy PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
 
 add_library(strategyStatic STATIC ${HEADER_FILES} libz2s.cpp ZonotopStrategy.cpp SimpleTree.cpp)
-add_dependencies(strategyStatic ptrie-ext json-ext)
+if (STRATEGY_GetDependencies)
+	add_dependencies(strategyStatic ptrie json)
+endif (STRATEGY_GetDependencies)
 target_include_directories (strategyStatic PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
 set_target_properties(strategyStatic PROPERTIES OUTPUT_NAME strategy)
 
 if(NOT LIBSTRATEGY_OnlyLibrary)
 	add_executable(z2s ${HEADER_FILES} main.cpp ZonotopStrategy.cpp SimpleTree.cpp)
-        add_dependencies(z2s ptrie-ext json-ext)
+	if (STRATEGY_GetDependencies)
+		add_dependencies(z2s ptrie json)
+	endif (STRATEGY_GetDependencies)
 	target_link_libraries(z2s PRIVATE stdc++fs ${Boost_LIBRARIES})
 endif()