From a0ac01c0095441124978ad1fa01a533911c30e79 Mon Sep 17 00:00:00 2001
From: khizmax <libcds.dev@gmail.com>
Date: Tue, 7 Mar 2017 23:07:51 +0300
Subject: [PATCH] [cmake] Added ability to specify C++ std explicitly in
 -DCMAKE_CXX_FLAGS cmdline option

---
 CMakeLists.txt | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index e1f1f47a..e6bdf69b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -98,7 +98,16 @@ if(NOT CMAKE_BUILD_TYPE)
 endif()
 
 if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -Wall -Wextra -pedantic -fno-strict-aliasing")
+    string(REGEX MATCHALL "-std=[^ ]+" cxx_std_found ${CMAKE_CXX_FLAGS})
+    if(cxx_std_found)
+        message("C++ std: ${cxx_std_found}")
+    else()
+        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
+        message("C++ std: -std=c++11 (default)")
+    endif()
+
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -pedantic -fno-strict-aliasing")
+
     if(CMAKE_TARGET_ARCHITECTURE STREQUAL "x86_64")
         set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mcx16")
         set(LIB_SUFFIX "64")
-- 
2.34.1