Re: [uml-devel] Re: problems with UML, issues with includes

[BlaisorBlade <blaisorblade_spam@yahoo.it>]

Alle 16:08, martedì 2 marzo 2004, Chris Friesen ha scritto:
> Jeff Dike wrote:
>
> Maybe I'm just confused about how the various things get compiled.  In a
> normal kernel build, including <linux/sched.h> gets you the kernel
> headers, not the libc headers.

> I had assumed that I would be able to get
> at the UML kernel's sched.h from within the arch/um code.  Is this a
> false assumption?  Or am I just doing it wrong?

Inside arch/um, there are some files which can include *only* the kernel 
includes, and some files which can include *only* the libc includes; 
os/file.c is of the second type. In the directory Makefile, the files listed 
in USER_OBJS are of the second type:

USER_OBJS := $(foreach file,file.o process.o tty.o,$(obj)/$(file))
i.e. file.o is listed. Note this idiom:

 USER_OBJS := $(filter %_user.o,$(obj-y) $(obj-m)) fd.o ...

the $(filter ) part means a "grep" for *_user.o: i.e. every file ending in 
_user.c is compiled against libc headers.

-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729



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