Put compiler checks in their own cmake module

cmake/CompilerChecks.cmake

@@ -0,0 +1,57 @@
+# Detect Clang compiler
+if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
+    set(CMAKE_COMPILER_IS_CLANGXX 1)
+endif()
+
+# Require C++11
+if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_COMPILER_IS_CLANGXX)
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
+endif()
+
+
+# Compile-time type size checks
+include(CheckTypeSize)
+
+if(NOT WCHAR_BYTES)
+    check_type_size("wchar_t" WCHAR_BYTES)
+    if(NOT WCHAR_BYTES)
+        message(FATAL_ERROR "Could not determine sizeof(wchar_t)")
+        set(WCHAR_BYTES 0)
+    endif()
+endif()
+
+if(NOT SIZEOF_LONG)
+    check_type_size("long" SIZEOF_LONG)
+    if(NOT SIZEOF_LONG)
+        message(FATAL_ERROR "Could not determine sizeof(long)")
+        set(SIZEOF_LONG 0)
+    endif()
+endif()
+
+# Check for CPUID headers
+try_compile(HAVE_CPUID ${PROJECT_BINARY_DIR}
+            ${PROJECT_SOURCE_DIR}/cmake/check_cpuid.cpp
+            OUTPUT_VARIABLE OUTPUT)
+if(HAVE_CPUID)
+    message("CPUID header found -- using hardware math acceleration when available")
+else()
+    message("CPUID header not found -- using software math")
+endif()
+
+# Look for a supported "deprecated" attribute specifier.
+try_compile(HAVE_CXX14_DEPRECATED_ATTR ${PROJECT_BINARY_DIR}
+            ${PROJECT_SOURCE_DIR}/cmake/check_deprecated_attribute.cpp
+            COMPILE_DEFINITIONS -DTRY_ATTRIBUTE
+            OUTPUT_VARIABLE OUTPUT)
+try_compile(HAVE_GCC_DEPRECATED_ATTR ${PROJECT_BINARY_DIR}
+            ${PROJECT_SOURCE_DIR}/cmake/check_deprecated_attribute.cpp
+            COMPILE_DEFINITIONS -DTRY_GCC_ATTR
+            OUTPUT_VARIABLE OUTPUT)
+try_compile(HAVE_MSVC_DEPRECATED_ATTR ${PROJECT_BINARY_DIR}
+            ${PROJECT_SOURCE_DIR}/cmake/check_deprecated_attribute.cpp
+            COMPILE_DEFINITIONS -DTRY_MSVC_ATTR
+            OUTPUT_VARIABLE OUTPUT)
+
+configure_file(${PROJECT_SOURCE_DIR}/cmake/hsCompilerSpecific.h.cmake
+               ${PROJECT_BINARY_DIR}/hsCompilerSpecific.h)
+include_directories(${PROJECT_BINARY_DIR})

cmake/hsCompilerSpecific.h.cmake

@@ -45,6 +45,9 @@ You can contact Cyan Worlds, Inc. by email legal@cyan.com
 
 #cmakedefine HAVE_CPUID
 
+#define WCHAR_BYTES ${WCHAR_BYTES}
+#define SIZEOF_LONG ${SIZEOF_LONG}
+
 #cmakedefine HAVE_CXX14_DEPRECATED_ATTR
 #cmakedefine HAVE_GCC_DEPRECATED_ATTR
 #cmakedefine HAVE_MSVC_DEPRECATED_ATTR