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kbuild: use Linux Kernel build scripts

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Now we are ready to switch over to real Kbuild.

This commit disables temporary scripts:
  scripts/{Makefile.build.tmp, Makefile.host.tmp}
and enables real Kbuild scripts:
  scripts/{Makefile.build,Makefile.host,Makefile.lib}.

This switch is triggered by the line in scripts/Kbuild.include
  -build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build.tmp obj
  +build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj

We need to adjust some build scripts for U-Boot.
But smaller amount of modification is preferable.

Additionally, we need to fix compiler flags which are
locally added or removed.

In Kbuild, it is not allowed to change CFLAGS locally.
Instead, ccflags-y, asflags-y, cppflags-y,
CFLAGS_$(basetarget).o, CFLAGS_REMOVE_$(basetarget).o
are prepared for that purpose.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Tested-by: Gerhard Sittig <gsi@denx.de>
This commit is contained in:
Masahiro Yamada
2014-02-04 17:24:28 +09:00
committed by Tom Rini
parent 22433fc54b
commit 6825a95b0b
77 changed files with 525 additions and 324 deletions
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22
scripts/Makefile.build
View File

@@ -2,7 +2,16 @@
# Building
# ==========================================================================
src := $(obj)
# Modified for U-Boot
ifeq ($(CONFIG_TPL_BUILD),y)
src := $(patsubst tpl/%,%,$(obj))
else
ifeq ($(CONFIG_SPL_BUILD),y)
src := $(patsubst spl/%,%,$(obj))
else
src := $(obj)
endif
endif
PHONY := __build
__build:
@@ -35,6 +44,11 @@ subdir-ccflags-y :=
include scripts/Kbuild.include
# Added for U-Boot
# We must include config.mk after Kbuild.include
# so that some config.mk can use cc-option.
include config.mk
# For backward compatibility check that these variables do not change
save-cflags := $(CFLAGS)
@@ -115,14 +129,16 @@ ifneq ($(hostprogs-y)$(hostprogs-m),)
include scripts/Makefile.host
endif
ifneq ($(KBUILD_SRC),)
# Uncommented for U-Boot
# We need to create output dicrectory for SPL and TPL even for in-tree build
#ifneq ($(KBUILD_SRC),)
# Create output directory if not already present
_dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
# Create directories for object files if directory does not exist
# Needed when obj-y := dir/file.o syntax is used
_dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d)))
endif
#endif
ifndef obj
$(warning kbuild: Makefile.build is included improperly)