Re: failing to compile ldd2 sample code

[Florin Malita <mali@xxxxx>]

Check out http://lwn.net/Articles/21823/ for the correct way to build 
external modules (if there is such a thing ;). It is 2.6 specific but 
easy to adapt for 2.4.


Hinko Kocevar wrote:
> Hi,
>
> I'm reading LDD2 and trying to compile sample code as I go along,
> unfortunately I stumbled on some errors at the very first hello.c
> module. I'm  running suse9, with latest kernel and sources installed
> (2.4.21-231).
>
> Compiling with: gcc -c hello.c
> Attached are my hello world module and corresponding error output:
>
> #define MODULE
> #include <linux/module.h>
>
>
> int init_module (void) {
>         printk("<1>Hello, World!\n");
>
>         return 0;
> }
>
> void cleanup_module(void) {
>         printk("<1>Goodbye, cruel world!\n");
> }
>
>
>
> regards,
> H
>
>
> ------------------------------------------------------------------------
>
> In file included from /usr/include/linux/sched.h:12,
>                  from /usr/include/linux/module.h:9,
>                  from hello.c:3:
> /usr/include/linux/jiffies.h:16: error: parse error before "jiffies_64"
> /usr/include/linux/jiffies.h:20: error: parse error before "get_jiffies_64"
> In file included from /usr/include/linux/sched.h:20,
>                  from /usr/include/linux/module.h:9,
>                  from hello.c:3:
> /usr/include/asm/mmu.h:13: error: field `sem' has incomplete type
> In file included from /usr/include/linux/signal.h:4,
>                  from /usr/include/linux/sched.h:24,
>                  from /usr/include/linux/module.h:9,
>                  from hello.c:3:
> /usr/include/linux/list.h:563:2: warning: #warning "don't include kernel headers in userspace"
> In file included from /usr/include/asm/siginfo.h:4,
>                  from /usr/include/linux/signal.h:7,
>                  from /usr/include/linux/sched.h:24,
>                  from /usr/include/linux/module.h:9,
>                  from hello.c:3:
> /usr/include/asm-generic/siginfo.h:49: error: size of array `_pad' is too large
> In file included from /usr/include/linux/sched.h:26,
>                  from /usr/include/linux/module.h:9,
>                  from hello.c:3:
> /usr/include/linux/fs_struct.h:9: error: parse error before "rwlock_t"
> /usr/include/linux/fs_struct.h:13: error: parse error before '}' token
> In file included from /usr/include/linux/sched.h:28,
>                  from /usr/include/linux/module.h:9,
>                  from hello.c:3:
> /usr/include/linux/completion.h:15: error: parse error before "wait_queue_head_t"
> /usr/include/linux/completion.h: In function `init_completion':
> /usr/include/linux/completion.h:26: error: dereferencing pointer to incomplete type
> /usr/include/linux/completion.h:27: error: dereferencing pointer to incomplete type
> In file included from /usr/include/linux/sched.h:29,
>                  from /usr/include/linux/module.h:9,
>                  from hello.c:3:
> /usr/include/linux/pid.h: At top level:
> /usr/include/linux/pid.h:18: error: field `task_list' has incomplete type
> /usr/include/linux/pid.h:19: error: field `hash_chain' has incomplete type
> /usr/include/linux/pid.h:24: error: field `pid_chain' has incomplete type
> In file included from /usr/include/linux/sched.h:30,
>                  from /usr/include/linux/module.h:9,
>                  from hello.c:3:
> /usr/include/linux/percpu.h: In function `__alloc_percpu':
> /usr/include/linux/percpu.h:46: error: `GFP_KERNEL' undeclared (first use in this function)
> /usr/include/linux/percpu.h:46: error: (Each undeclared identifier is reported only once
> /usr/include/linux/percpu.h:46: error: for each function it appears in.)
> In file included from /usr/include/linux/sched.h:101,
>                  from /usr/include/linux/module.h:9,
>                  from hello.c:3:
> /usr/include/linux/timer.h: At top level:
> /usr/include/linux/timer.h:10: error: field `entry' has incomplete type

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