c++编译时打印宏定义

#pragma message("this is message")

#pragma message只能打印字符串，如果想打印任何宏定义可使用：

#define PRINT_MACRO_HELPER(x) #x
#define PRINT_MACRO(x) #x"="PRINT_MACRO_HELPER(x)
#pragma message(PRINT_MACRO(var))

如：#define __cplusplus 199911L

#pragma message(PRINT_MACRO(__cplusplus))

Android.mk输出信息

$(warning "LOCAL_PATH is$(LOCAL_PATH)")
$(warning "TARGET_ARCH is$(TARGET_ARCH)")