[U-Boot] RFC: auto-generate ARM mach-types.h file from ARM machine database

[Michael Schwingen <rincewind@discworld.dascon.de>]

Am 05/09/2011 07:37 AM, schrieb Wolfgang Denk:
> Dear Michael Schwingen,
>
> In message <4DC5259C.7040208@discworld.dascon.de> you wrote:
>> If I put rules in arch/arm/config.mk, then the first of these rules
>> becomes the default rule which is executed in subdir makes (like "make
>> -C arch"), which breaks compilation completely, since config.mk is
>> included before the rules are defined in the subdir Makefiles.
> You are not suppoed to put any make rules in config.mk files.
>
>> It seems the current scheme allows only variable definitions in
>> config.mk files, which is not sufficient here.
> As the name implies, these files contain configuration (= variable)
> settings. Nothing else.
>
>> rules.mk would be fine, however, there is no provision to include rules
>> from lower directories, since all the building in subdirectories is
>> handled by recursively calling make (this is one of the problems that
>> arise by recursively calling make for each directory, but that is a
>> different topic).
> But lower level directories inherit all settings from the top level
> Makefile?
Yes.
However, the rule to generate autoconf.mk is in the toplevel Makefile,
and I need the rule to generate mach-types.h at the same level, as
autoconf.mk depends on it. The lower-level *Makefiles* are executed too
late to generate anything that is needed for autoconf.mk.

cu
Michael