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diff --git a/CMakeLists.txt b/CMakeLists.txt
index a3388dd..f0626e5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -119,12 +119,16 @@ elseif(CMAKE_COMPILER_IS_GNUCXX)
"${CMAKE_CXX_FLAGS} -std=c++0x")
endif(CYGWIN)
set(CMAKE_CXX_FLAGS
- "${CMAKE_CXX_FLAGS} -Wall -pedantic -Werror -Wextra -Werror=shadow")
+ "${CMAKE_CXX_FLAGS} -Wall -pedantic -Wextra -Werror=shadow")
if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 4.4)
if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 7.0)
set(CMAKE_CXX_FLAGS
"${CMAKE_CXX_FLAGS} -faligned-new")
endif()
+ if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 7.0)
+ set(CMAKE_CXX_FLAGS
+ "${CMAKE_CXX_FLAGS} -Wextra")
+ endif()
set(CMAKE_CXX_FLAGS
"${CMAKE_CXX_FLAGS} -Wunused-result -Werror=unused-result -Wunused-parameter -Werror=unused-parameter")
endif()
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