Fix minor problem with extern/poshlib not being c++ at all, so

-std=c++11 is not a valid option.  A cmake 2.8.0 compatible approach
that involves CMAKE_CXX_FLAGS causes problems for the CUDA compressor
module that _cannot_ accept -std=c++11.  This approach seems the most
correct, but I'm new to CMake, so there may be a better solution.

CMakeLists.txt

@@ -1,15 +1,10 @@
-CMAKE_MINIMUM_REQUIRED(VERSION 2.8.0)
+CMAKE_MINIMUM_REQUIRED(VERSION 2.8.12)
 PROJECT(NV)
 ENABLE_TESTING()
 
 SET(NV_CMAKE_DIR "${NV_SOURCE_DIR}/cmake")
 SET(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${NV_CMAKE_DIR}")
 
-# GCC check (needs -std:c++11 flag)
-if(CMAKE_COMPILER_IS_GNUCC)
-	ADD_DEFINITIONS("-std=c++11")
-ENDIF(CMAKE_COMPILER_IS_GNUCC)
-
 IF(WIN32)
 	# gnuwin32 paths:
 	SET(GNUWIN32_PATH "${NV_SOURCE_DIR}/extern/gnuwin32")

src/CMakeLists.txt

@@ -3,6 +3,10 @@ INCLUDE_DIRECTORIES(${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_CURRENT_BINARY_DIR})
 INCLUDE_DIRECTORIES(${NV_SOURCE_DIR}/extern/poshlib)
 INCLUDE_DIRECTORIES(${NV_SOURCE_DIR}/extern/stb)
 
+if(CMAKE_COMPILER_IS_GNUCC)
+       ADD_COMPILE_OPTIONS(-std=c++11)
+ENDIF(CMAKE_COMPILER_IS_GNUCC)
+
 SUBDIRS(nvcore)
 SUBDIRS(nvmath)
 SUBDIRS(nvimage)