Usage of "files" for config

[Eygene Ryabinkin]

Srinivas, good day.

Tue, Oct 28, 2008 at 03:52:35AM +0530, Srinivas wrote:
> I would like to know the usage of files and files.[arch] in sys/conf.
> Basically, I didnt get the advantage of having a common file for
> compilation(like files) rather than an individual Makefile in each
> subdirectory.

'files' and 'files.$ARCH' are the input directives for the config(8)
utility.  Makefile is produced with the help of these files.  The
rationale for having 'files' and 'files.$ARCH' is simple: there are
platform-specific directives and common directives.

> 
> I have read makefile(of mkmakefile.c in config). What is the usage of
> "standard", "optional" and "mandatory" and why it is followed by
> device.

Read comments from 'mkmakefile.c':
-----
        /*
         * If an entry is marked "mandatory", config will abort if it's
         * not called by a configuration line in the config file.  Apart
         * from this, the device is handled like one marked "optional".
         */
-----

> What are .m files? What are they used for?

They define module interfaces and are processed by the AWK script
/sys/tools/makeobjops.awk.  The output will be source and header files,
named <m-file-name>.c and <m-file-name>.h.  You can do 'ls *_if.[ch]' in
the kernel build directory and examine some files to get a hint on
what's going on.  M-files are processed with the help of
/sys/conf/kern.post.mk and /sys/conf/kmod.mk.

> Why are some of the rules in the generated makefile *.ln like scsi_all.ln?

These files are lint(1)'ed: see /sys/conf/kern.post.mk, search for
LNFILES.

> What is ${NORMAL_LINT} and ${NORMAL_C} in the generated makefile mean?

'make -V NORMAL_LINT' and 'make -V NORMAL_C' invoked from the kernel
compilation directory should tell you about the values of these
variables.  They are defined by /sys/conf/kern.pre.mk, so you can
examine it as well.
-- 
Eygene
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