update cmakelists

lib/CMakeLists.txt

@@ -1,10 +1,17 @@
 # 设置编译选项
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -O2")
-if(WIN32)
-	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O2")
-else()
-	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} --std=c++11 -O2")
+if(${CMAKE_HOST_SYSTEM_NAME} STREQUAL "Windows")
+	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -O2")
 endif()
+
+if(${CMAKE_HOST_SYSTEM_NAME} STREQUAL "Linux")
+	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -lm -O2")
+endif()
+
+if(${CMAKE_HOST_SYSTEM_NAME} STREQUAL "Darwin")
+	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -O2")
+endif()
+
+
 # 设置库文件的输出地址
 set(LIBRARY_OUTPUT_PATH ${PROJECT_BINARY_DIR}/lib)
 
@@ -25,6 +32,12 @@ set_target_properties(tess_static PROPERTIES CLEAN_DIRECT_OUTPUT 1)
 # 设置动态库的版本号
 set_target_properties(tess PROPERTIES VERSION 1.6 SOVERSION 1.6)
 
+# 链接动态库
+if(${CMAKE_HOST_SYSTEM_NAME} STREQUAL "Linux")
+	target_link_libraries(tess PUBLIC m)
+	target_link_libraries(tess_static m.a)
+endif()
+
 # 库的安装命令
 if(WIN32)
 	install(TARGETS tess DESTINATION lib)