syscall.cc:41: undefined reference to `KERNEL_THREAD_SAVED_KERNEL_TOP_OFFSET' Okay I get it. So probably linker is not finding a macro? So I tried to define it inside of .cc too with some different value. #include "syscall.h" #include "kthread.h" #define KERNEL_THREAD_S...
错误原因:文件扩展名不是 ‘.c’。 (2)、error:undefined reference to 'foo' 中文含义:没定义对'foo' 的引用。 错误原因:程序中使用了在本文件和其它库中没有定义的函数或变量。有可能是丢失了链接库,或使用了不正确的名字。 (3)、error:usr/lib/crt0.o: Undefined symbol _main referenced from textseg...
Is there a one line macro definition to determine the endianness of the machine? I am using the following code but converting it to macro would be too long: unsigned char test_endian( void ) { int test_var = 1; unsigned char *test_endian = (unsigned char*)&test_var; return ...
If a constant expression is an undefined macro, its value is considered 0. #if MACRO_NON_DEFINED = #if 0 When you determine whether a macro is defined, you should avoid using #if, because the value of that macro may be defined as 0., and you should use the #ifdef or #ifndef. as...
macro.c:2:19: note: in definition of macro ‘PRINT’#define PRINT(x) (x)^ 很明显,编译器并不知道x的类型,而printf函数试图打印x的值,失败是不可避免的。 问题似乎已经找出来了,现在只需要将x改为字符串。宏定义如下: #define PRINT(x) ("x") ...
{ //checking a defined Macro #ifdef NUM printf("Macro NUM is defined, and its value is %d\n",NUM); #else printf("Macro NUM is not defined\n"); #endif //checking an undefined Macro #ifdef MAX printf("Macro MAX is defined, and its value is %d\n",MAX); #else printf("Macro ...
macrodefineddefinitionspre编译elif c中的预编译宏定义(PredefinedmacrodefinitionsinC)Cbeginnersmaynothavewhattheconceptofpreprocessor,thisisexcusable:GeneralCcompilerwillpretreatment,assembler,compiler,connectionprocesstointegratetogether.Preprocessoroftenruninthebackground.InsomeoftheCcompiler,alltheseprocessesarecompleted...
undefined structure ``xxx`` 没有定义的结构xxx undefined symbol ``xxx`` 没有定义的符号xxx unexpected end of file in comment started on line xxx 从xxx行开始的注解尚未结束文件不能结束 unexpected end of file in conditional started on line xxx 从xxx 开始的条件语句尚未结束文件不能结束 unknown ...
no_sanitize_undefined no_reorder bnd_legacy bnd_instrument stack_protect error warning Other attributes, including section are supported forvariablesdeclarations,labelsand fortypes. You may also specify attributes with ‘__’ preceding and following each keyword. This allows you to use them in header...
C preprocessor macros do have a well-defined scope, but that scope is only relevant to the preprocessing phase, not any other phase of translation.That scope is "From point of definition until the end of the current translation unit, or until the macro is undefined using#undefineor redefined...