enable c++11 compilation and check for c++11 support

added GCC  option to enable c++11 support
added try compile statement to check for c++11 support
with small test program for checking null pointer and new initializers
removed the obtaining of GCC version (no longer being used)

CMakeLists.txt

@@ -25,7 +25,29 @@ project(ibcp)
 
 cmake_minimum_required(VERSION 2.8)
 
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -Werror -pedantic-errors")
+# enable all compiler warnings as errors, enable c++11 compilation
+set(CMAKE_CXX_FLAGS
+	"${CMAKE_CXX_FLAGS} -Wall -Wextra -Werror -pedantic-errors -std=c++11"
+)
+
+# check for c++11 support
+message(STATUS "Checking for working C++11 compiler: ${CMAKE_CXX_COMPILER}")
+try_compile(CPP11_GOOD
+	${PROJECT_BINARY_DIR}
+	${PROJECT_SOURCE_DIR}/test/cpp11.cpp
+	OUTPUT_VARIABLE OUTPUT
+)
+if (${CPP11_GOOD})
+	message(STATUS
+		"Checking for working C++11 compiler: ${CMAKE_CXX_COMPILER} -- works"
+	)
+else ()
+	message(FATAL_ERROR
+		"The C++ compiler is not able to compile a simple C++11 test program.\n"
+		"It fails with the following output:\n"
+		"${OUTPUT}"
+	)
+endif ()
 
 # prevent in source directory builds
 if (PROJECT_SOURCE_DIR STREQUAL PROJECT_BINARY_DIR)
@@ -39,11 +61,6 @@ endif (PROJECT_SOURCE_DIR STREQUAL PROJECT_BINARY_DIR)
 find_package(Qt4 REQUIRED QtCore QtGui)
 include(${QT_USE_FILE})
 
-# check GCC versionn
-execute_process(COMMAND ${CMAKE_C_COMPILER} -dumpversion
-	OUTPUT_VARIABLE GCC_VERSION
-)
-
 # ckeck is a specific build type is set in the environment
 if (NOT $ENV{CMAKE_BUILD_TYPE} STREQUAL "")
     if (NOT CMAKE_BUILD_TYPE)

test/cpp11.cpp

@@ -0,0 +1,18 @@
+#include <iostream>
+
+int main()
+{
+	// test initializers
+	int i {1};
+	double d {2.0};
+
+	// test initializer list
+	int a[] {1, 2, 3, 4};
+
+	// test nullptr
+	int *pi {nullptr};
+
+	pi = &i;
+
+	std::cout << d << a[1] << *pi << std::endl;
+}