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POcompiling my own kernel (not from linux-kernel source)
 

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  1. POcompiling my own kernel (not from linux-kernel source)
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    <p>I'm following the kernel tutorial from <a href="http://www.osdever.net/bkerndev/Docs/intro.htm" rel="nofollow noreferrer">here</a></p> <p>im having problems compiling my files.</p> <p>i get the following errors when i try to compile:</p> <pre><code>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 *’ </code></pre> <p>My files are exact copies of the ones from the tutorial.<br> I can see that in main.c the functions are defined like so</p> <p><code> void *memcpy(void *dest,const void *src, size_t count) </code></p> <p>but in my system.h file they are defined like so</p> <p><code> extern unsigned char *memcpy(unsigned char *dest,const unsigned char *src, int count) </code></p> <p>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?</p>
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    1. USMatt Phillips
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    1. CONot really an answer to your question, but I wouldn't recommend learning C and learning kernel development all in one shot. Do some userland work in C first before you start trying to write your own kernel!
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      1. USDaniel Pryden
    2. COI understand your point. The tutorial is very straightforward though and I understand what it is doing. My main struggle is why the files would fail to compile from the tutorial. You would think something like function type declarations would not be a problem when you are pulling the code from a tutorial!
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      1. USMatt Phillips
    3. COI'm not so sure you do understand what it is doing. If C isn't your primary language, have you spent a lot of time working in assembly language on your target platform? Because if you haven't done either C or assembly, then I'd be hard pressed to imagine that you can fully follow along with what the kernel is supposed to be doing.
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