From 141af072b9482cbcabd5d2bbad2c5b9a919df491 Mon Sep 17 00:00:00 2001
From: Eugene Shalygin <eugene.shalygin@gmail.com>
Date: Sun, 16 Sep 2018 18:29:15 +0200
Subject: [PATCH] cmake: use C++14 when available

Libtorrent does the same and we have to follow since
its ABI depends on the C++ standard version.

Partially closes #9485.
---
 src/CMakeLists.txt | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 71435f360..741668956 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,5 +1,13 @@
 set(CMAKE_CXX_STANDARD_REQUIRED True)
-set(CMAKE_CXX_STANDARD "11")
+
+# If C++14 is available, use it as libtorent ABI depends on 11/14 version
+if (cxx_std_14 IN_LIST CMAKE_CXX_COMPILE_FEATURES)
+    message(STATUS "Building in C++14 mode")
+    set(CMAKE_CXX_STANDARD "14")
+else()
+    message(STATUS "Building in C++11 mode")
+    set(CMAKE_CXX_STANDARD "11")
+endif()
 
 include(MacroQbtCompilerSettings)
 qbt_set_compiler_options()