• Masahiro Yamada's avatar
    Makefile: prepare for using Kbuild-style Makefile · ce28d7ac
    Masahiro Yamada authored
    Every makefile in sub directories has common lines
    at the top and the bottom.
    This commit pushes the common parts into script/Makefile.build.
    Going forward sub-makefiles only need to describe this part:
        COBJS := ...
        COBJS += ...
        SOBJS := ...
    But using obj-y is preferable to prepare for switching to Kbuild.
    The conventional (non-Kbuild) Makefile style is still supported.
    This is achieved by greping the Makefile before entering into it.
    U-Boot conventional sub makefiles always include some other makefiles.
    So the build system searches a line beginning with "include" keyword
    in the makefile in order to distinguish which style it is.
    If the Makefile include a "include" line, we assume it is a conventional
    U-Boot style. Otherwise, it is treated as a Kbuild-style makefile.
    With this tweak, we can switch sub-makefiles
    from U-Boot style to Kbuild style little by little.
    obj-y := foo/
    syntax (descending into the sub directory) is not supportd yet.
    It will be implemented in the upcomming commit.
    Signed-off-by: default avatarMasahiro Yamada <yamada.m@jp.panasonic.com>
    Cc: Simon Glass <sjg@chromium.org>
    Cc: Tom Rini <trini@ti.com>
Makefile.build 1.09 KB