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authorMasahiro Yamada <yamada.m@jp.panasonic.com>2013-10-17 17:34:47 +0900
committerTom Rini <trini@ti.com>2013-10-31 12:53:39 -0400
commitce28d7ac6d64c8a730334c8584742cf7255ad318 (patch)
treed8a3cc7f649f1674f1aeb661e0986a8413b46be2 /Licenses/lgpl-2.1.txt
parent9d33fb4a5cfe2767f389cc64ba16c21906e36856 (diff)
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Makefile: prepare for using Kbuild-style Makefile
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: Masahiro Yamada <yamada.m@jp.panasonic.com> Cc: Simon Glass <sjg@chromium.org> Cc: Tom Rini <trini@ti.com>
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