add extra warnings, also recreate the build directory if

cmake didn't complete.

CMakeLists.txt

@@ -46,6 +46,13 @@ MACRO(TARGET_LINK_LLVM TARGET)
   TARGET_LINK_LIBRARIES(${TARGET} ${LLVM_LDFLAGS} ${LLVM_LIBS_CORE} ${LLVM_LIBS_JIT} ${LLVM_LIBS_JIT_OBJECTS})
 ENDMACRO(TARGET_LINK_LLVM)
 
+#
+# Add extra warnings for gcc/g++.
+#
+IF(CMAKE_COMPILER_IS_GNUCXX)
+  ADD_DEFINITIONS(-W -Wall -Wextra)
+ENDIF()
+
 FOREACH(ARCHITECTURE ${GUEST_ARCHITECTURES})
 	IF(EXISTS ${PROJECT_SOURCE_DIR}/arch/${ARCHITECTURE})
 		MESSAGE("** Building Guest Architecture: ${ARCHITECTURE}")

Makefile

@@ -2,8 +2,8 @@ NCPU=`../CMake/GetCPUCount.sh`
 
 all:
 	@cmake --version &> /dev/null || (echo Please install "cmake" before running "make". ; exit 1)
-	@if [ ! -d build ]; \
-	then rm -f build; mkdir build; cd build; cmake ..; cd ..; \
+	@if [ ! -d build ] || [ ! -f build/Makefile ]; \
+	then rm -fr build; mkdir build; cd build; cmake ..; cd ..; \
 	fi
 	@cd build; make -j${NCPU}