compiling kernel files with gcc

[James Kosin]

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abhijit kumar wrote:

|dear all!
|  i want to compile my "/usr/src/inux/kernel/sched.c" with gcc -E .i
|want to do this because i want to study and understand the "sched.c" .
|when i was studying it i came to know that in linux many MACRO name
|are used in multiple files. so ; it is very tough to know that which
|value of MACRO my "sched.c" is actually using. for this purpose one of
|my friend has suggested to use gcc -E option. but when i run it i have
|following problem:--

Hmm... sounds like a homework question.

|
|
|[root at localhost root]# gcc -E /usr/src/linux/kernel/sched.c -isystem
|/usr/src/linux/include >> backup.out
|
|In file included from /usr/src/linux/include/linux/sched.h:6,
|                 from /usr/src/linux/include/linux/mm.h:4,
|                 from /usr/src/linux/kernel/sched.c:20:
|/usr/src/linux/include/linux/config.h:6:2: #error including kernel
|header in userspace; use the glibc headers instead!
|In file included from /usr/src/linux/include/linux/signal.h:4,
|                 from /usr/src/linux/include/linux/sched.h:25,
|                 from /usr/src/linux/include/linux/mm.h:4,
|                 from /usr/src/linux/kernel/sched.c:20:
|/usr/src/linux/include/linux/list.h:682:2: warning: #warning "don't
|include kernel headers in userspace"
|In file included from /usr/src/linux/include/linux/nmi.h:7,
|                 from /usr/src/linux/kernel/sched.c:22:
|/usr/src/linux/include/asm/irq.h:16:25: irq_vectors.h: No such file or 
directory
|
|i.e. it is n't correctly compiled and n't able to include some header
|files and it gives some
|"#warning "don't include kernel headers in userspace". please suggest
|me what i should do for getting out of my problem.

A lot has changed since the previous kernels:
~    1)  Header files have moved.  A lot of the /linux/include files are 
not stored there anymore.
~    2)  Much of the architecture has changed with the latest kernels,  
Please read the associated documents included with the source to find 
out what has changed.

|
|
|If all of you have any link about some materials or tutorials to learn
|about 2.6 kernel (specially it's process scheduling code and method )
|please suggest me. i 've "understanding Linux kernel - o R'eily " and
|"Linux Kernel Programming" both for kernel 2.4.it is n't helping me
|(or perhaps i do n't know how to use it).


What happens if you use the makefile.  It sounds a little like you want 
to compile the file all on its own.  It doesn't work this way.

You also have to take the 2.4.xx stuff with a grain of salt.  The 2.6.xx 
stuff has changed drastically in many respects.

|
|Thanking You
|Abhijit
|
Good Luck with your homework,
James Kosin
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