编译我自己的内核（而不是从Linux内核源代码） [英] compiling my own kernel (not from linux-kernel source)

问题描述

我下面从内核教程这里

有我的编译文件的问题IM。

im having problems compiling my files.

我碰到下面的错误，当我试图编译：

i get the following errors when i try to compile:

main.c:8: error: expected declaration specifiers or ‘...’ before ‘size_t’
main.c:8: error: conflicting types for ‘memcpy’                          
./include/system.h:5: note: previous declaration of ‘memcpy’ was here    
main.c: In function ‘memcpy’:                                            
main.c:12: error: ‘count’ undeclared (first use in this function)        
main.c:12: error: (Each undeclared identifier is reported only once      
main.c:12: error: for each function it appears in.)                      
main.c: At top level:                                                    
main.c:16: error: expected declaration specifiers or ‘...’ before ‘size_t’
main.c:16: error: conflicting types for ‘memset’
./include/system.h:6: note: previous declaration of ‘memset’ was here
main.c: In function ‘memset’:
main.c:19: error: ‘count’ undeclared (first use in this function)
main.c: At top level:
main.c:23: error: expected declaration specifiers or ‘...’ before ‘size_t’
main.c:23: error: conflicting types for ‘memsetw’
./include/system.h:7: note: previous declaration of ‘memsetw’ was here
main.c: In function ‘memsetw’:
main.c:26: error: ‘count’ undeclared (first use in this function)
main.c: At top level:
main.c:30: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘strlen’
main.c:49: warning: return type of ‘main’ is not ‘int’
main.c: In function ‘main’:
main.c:64: warning: pointer targets in passing argument 1 of ‘puts’ differ in    signedness
./include/system.h:13: note: expected ‘unsigned char *’ but argument is of type ‘char *’
main.c:51: warning: unused variable ‘i’
scrn.c: In function ‘scroll’:
scrn.c:24: warning: passing argument 1 of ‘memcpy’ from incompatible pointer type
./include/system.h:5: note: expected ‘unsigned char *’ but argument is of type ‘short unsigned int *’
scrn.c:24: warning: passing argument 2 of ‘memcpy’ from incompatible pointer type
./include/system.h:5: note: expected ‘const unsigned char *’ but argument is of type  ‘short unsigned int *’
scrn.c: In function ‘puts’:
scrn.c:139: warning: pointer targets in passing argument 1 of ‘strlen’ differ in signedness
./include/system.h:8: note: expected ‘const char *’ but argument is of type ‘unsigned char *’

我的文件是从教程中的的精确副本。结果
我可以看到，在main.c中的功能，像这样定义

My files are exact copies of the ones from the tutorial.
I can see that in main.c the functions are defined like so


无效*的memcpy（void *的DEST，常量无效* SRC，为size_t计数）


但在我system.h中的文件他们像这样定义

but in my system.h file they are defined like so


的extern unsigned char型*的memcpy（无符号字符* DEST，const的无符号字符* SRC，诠释计数）


C不是我的主要语言，但我在学习它的过程，所以我道歉，如果我的问题很简单，但我认为，这些定义应该是一样的呢？

C is not my primary language but i am in the process of learning it so I apologize if my question is simple but I would think that these definitions should be the same not?

推荐答案

也许你的问题是，为size_t 是不一样的 INT 你的平台上，或为size_t 未正确指定的。指针类型应行（从技术上讲，他们应该匹配过，但在大多数系统的sizeof（字符*）==的sizeof（无效*））。

Probably your issue is that size_t isn't the same as int on your platform, or size_t isn't specified correctly at all. The pointer types should be OK (technically, they should match too, but on most systems sizeof(char*) == sizeof(void*)).

如果您正在开发自己的内核，你想要编写自己的 system.h中。如果你正在写两个 system.h中和的main.c ，你可以让它们却匹配，你会喜欢。如果你看一下教程的这个页面，你会发现头部和C源代码都声明的memcpy 为：

If you're developing your own kernel, you'd want to write your own system.h. If you're writing both system.h and main.c, you can make them match up however you'd like. If you look at this page of the tutorial, you'd see that header and C source both declare memcpy as:

unsigned char *memcpy(unsigned char *dest, const unsigned char *src, int count);

但是，如果你下载示例源文件在本教程的最后，你会发现它是不是：

But if you download the example source files at the end of the tutorial, you find it is instead:

void *memcpy(void *dest, const void *src, size_t count);

望着该文件的顶部，找到以下注释：

Looking at the top of that file, you find the following comment:

/* bkerndev - Bran's Kernel Development Tutorial
*  By:   Brandon F. ([e-mail])
*  Desc: Main.c: C code entry.
*
*  Notes: No warranty expressed or implied. Use at own risk. */

它看起来并不像你想跟随的教程，而是你正试图从一个教程剪切和粘贴code。这就像努力学习沿在一本书下进行脑部手术。你可能会得到它的工作，但如果你真的不明白你在做什么......嗯，请做世界一个忙，不使用它的任何东西的关键。

It doesn't look like you're trying to follow a tutorial, but rather that you're trying to cut and paste code from a tutorial. That's like trying to learn to perform brain surgery by following along in a book. You might get it to work, but if you don't really understand what you're doing... well, please do the world a favor and don't use it for anything critical.

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