Change SCons and CMake to C++14

(cherry-picked from commit 2a17ecc)

CMakeLists.txt

@@ -62,7 +62,7 @@ option(ENABLE_HISTORY "Enable using GNU history for history in lua console" ON)
 
 if(NOT CMAKE_CROSSCOMPILING)
 	try_run(IEEE754_TEST_RETURN_CODE IEEE754_TEST_COMPILED ${CMAKE_BINARY_DIR} ${CMAKE_SOURCE_DIR}/src/compile_time_tests/ieee_754.cpp
-		CMAKE_FLAGS "-DCMAKE_CXX_STANDARD=11" COMPILE_OUTPUT_VARIABLE IEEE754_TEST_COMPILE_OUTPUT)
+		CMAKE_FLAGS "-DCMAKE_CXX_STANDARD=14" COMPILE_OUTPUT_VARIABLE IEEE754_TEST_COMPILE_OUTPUT)
 	if(NOT IEEE754_TEST_COMPILED)
 		message(WARNING "Failed to compile the IEEE 754 test. Skipping it.")
 		message(${IEEE754_TEST_COMPILE_OUTPUT})
@@ -199,7 +199,7 @@ if(NOT DEFINED CXX_FLAGS_USER)
 
 endif(NOT DEFINED CXX_FLAGS_USER)
 
-set(COMPILER_FLAGS "-std=c++11 -Wall -Wextra -Werror=non-virtual-dtor -Wno-unused-local-typedefs -Wno-maybe-uninitialized -Wold-style-cast")
+set(COMPILER_FLAGS "-std=c++14 -Wall -Wextra -Werror=non-virtual-dtor -Wno-unused-local-typedefs -Wno-maybe-uninitialized -Wold-style-cast")
 
 if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
 	set(COMPILER_FLAGS "${COMPILER_FLAGS} -Qunused-arguments -Wno-unknown-warning-option -Wmismatched-tags -Wno-conditional-uninitialized")

SConstruct

@@ -108,7 +108,7 @@ opts.AddVariables(
     BoolVariable('ccache', "Use ccache", False),
     ('ctool', 'Set c compiler command if not using standard compiler.'),
     ('cxxtool', 'Set c++ compiler command if not using standard compiler.'),
-    EnumVariable('cxx_std', 'Target c++ std version', '11', ['11', '1y', '14']),
+    EnumVariable('cxx_std', 'Target c++ std version', '14', ['14']),
     BoolVariable('openmp', 'Enable openmp use.', False),
     ('sanitize', 'Enable clang and GCC sanitizer functionality. A comma separated list of sanitize suboptions must be passed as value.', ''),
     BoolVariable("fast", "Make scons faster at cost of less precise dependency tracking.", False),