Fix cmake broken when using lower version.

3f187c33 · Liu Yiqun · ea5b265f · 3f187c33
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cmake/flags.cmake cmake/flags.cmake +1 -1

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--- a/cmake/flags.cmake
+++ b/cmake/flags.cmake
@@ -26,7 +26,7 @@ function(CheckCompilerCXX11Flag)
 endfunction()

 CheckCompilerCXX11Flag()
-string(APPEND CMAKE_CXX_FLAGS " -std=c++11")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")

 # safe_set_flag
 #