kou commented on a change in pull request #7459:
URL: https://github.com/apache/arrow/pull/7459#discussion_r441221973
##########
File path: cpp/cmake_modules/SetupCxxFlags.cmake
##########
@@ -62,12 +62,15 @@ endif()
# Support C11
set(CMAKE_C_STANDARD 11)
-# This ensures that things like gnu++11 get passed correctly
-set(CMAKE_CXX_STANDARD 11)
+# This ensures that things like c++11 get passed correctly
+set(CMAKE_CXX_STANDARD ${ARROW_CXX_STANDARD})
Review comment:
How about using `CMAKE_CXX_STANDARD` directly instead of introducing
`ARROW_CXX_STANDARD`?
```diff
diff --git a/cpp/cmake_modules/DefineOptions.cmake
b/cpp/cmake_modules/DefineOptions.cmake
index 660caf91c..f916781d7 100644
--- a/cpp/cmake_modules/DefineOptions.cmake
+++ b/cpp/cmake_modules/DefineOptions.cmake
@@ -82,8 +82,6 @@ if("${CMAKE_SOURCE_DIR}" STREQUAL
"${CMAKE_CURRENT_SOURCE_DIR}")
define_option_string(ARROW_CXXFLAGS "Compiler flags to append when
compiling Arrow" "")
- define_option(ARROW_CXX_STANDARD "C++ standard to target (default C++11)"
11)
-
define_option(ARROW_BUILD_STATIC "Build static libraries" ON)
define_option(ARROW_BUILD_SHARED "Build shared libraries" ON)
diff --git a/cpp/cmake_modules/SetupCxxFlags.cmake
b/cpp/cmake_modules/SetupCxxFlags.cmake
index bf7a60138..ac7518eba 100644
--- a/cpp/cmake_modules/SetupCxxFlags.cmake
+++ b/cpp/cmake_modules/SetupCxxFlags.cmake
@@ -63,7 +63,9 @@ endif()
set(CMAKE_C_STANDARD 11)
# This ensures that things like c++11 get passed correctly
-set(CMAKE_CXX_STANDARD ${ARROW_CXX_STANDARD})
+if(NOT DEFINED CMAKE_CXX_STANDARD)
+ set(CMAKE_CXX_STANDARD 11)
+endif()
# We require a C++11 compliant compiler
set(CMAKE_CXX_STANDARD_REQUIRED ON)
```
The https://github.com/apache/arrow/pull/7459#issuecomment-645047309 error
will be fixed.
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