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This commit imports Kbuild-related updates
from v3.14 to v3.15-rc1.
- commit 3d3d6b8474204b6819688c9800774d52d370a538
kbuild: LLVMLinux: Adapt warnings for compilation with clang
- commit 61163efae02040f66a95c8ed17f4407951ba58fa
kbuild: LLVMLinux: Add Kbuild support for building kernel with Clang
- commit 79192ca8ebd9a25c583aa46024a250fef1e7766f
scripts: objdiff: detect object code changes between two commits
- commit 1c9e70a55b088d97a59241744fe459409d0c3582
kbuild: create a build directory automatically for out-of-tree build
- commit a03fcb50e816a69acffb13b5e56db75063aeba8a
kbuild: remove redundant '.*.cmd' pattern from make distclean
- commit 13338935f1574a2dcd1c891461b0dcc42f8cff42
kbuild: move "quote" to Kbuild.include to be consistent
- commit bfdfaeae500a3b194b73b01e92a8034791a58b7f
kbuild: specify build_docproc as a phony target
- commit f4d4ffc03efc864645b990e1d579bbe1b8e358a4
kbuild: dtbs_install: new make target
- commit 1e64ff42ea3d8d2fc8aa71f9717b3c1cb6c2f893
Kbuild, lto: Disable LTO for asm-offsets.c
- commit ccbef1674a1579842c7dbdf554efca85d2cd245a
Kbuild, lto: add ld-version and ld-ifversion macros
- commit ae63b2d7bdd9bd66b88843be0daf8e37d8f0b574
scripts/tags.sh: Ignore *.mod.c
- commit e36aaea28972c57a32a3ba5365e61633739719b9
kbuild: Fix silent builds with make-4
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
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Kbuild brought about many advantages for us but a significant
performance regression was reported by Simon Glass.
After some discussions and analysis, it turned out
its main cause is in $(call cc-option,...).
Historically, U-Boot parses all config.mk
(arch/*/config.mk and board/*/config.mk)
every time descending into subdirectories.
That means cc-options are evaluated over and over again.
$(call cc-option,...) is useful but costly.
So we want to evaluate them only in ./Makefile
and spl/Makefile and export compiler flags.
This commit changes the build system as follows:
- Modify scripts/Makefile.build to not include config.mk
Instead, add $(PLATFORM_CPPFLAGS) to asflags-y, ccflags-y,
cppflags-y.
- Export many variables
Going forward, Kbuild will not parse config.mk files
when it descends into subdirectories.
If we want to set variables in config.mk and use them
in subdirectories, they must be exported.
This is the list of variables to get exported:
PLATFORM_CPPFLAGS
CPUDIR
BOARDDIR
OBJCOPYFLAGS
LDFLAGS
LDFLAGS_FINAL
(used in nand_spl/board/*/*/Makefile)
CONFIG_STANDALONE_LOAD_ADDR
(used in examples/standalone/Makefile)
SYM_PREFIX
(used in examples/standalone/Makefile)
RELFLAGS
(used in examples/standalone/Makefile)
- Delete CPPFLAGS
This variable has been replaced with PLATFORM_CPPFLAGS
- Copy gcclibdir from example/standalone/Makefile
to arch/sparc/config.mk
The reference in CONFIG_STANDALONE_LOAD_ADDR must be
resolved before it is exported.
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Reported-by: Simon Glass <sjg@chromium.org>
Acked-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org> [on Sandbox]
Tested-by: Stephen Warren <swarren@nvidia.com> [on Tegra]
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Unlike Linux Kernel, U-Boot historically had *.dts files under
board/$(VENDOR)/dts/ and *.dtsi files under arch/$(ARCH)/dts/.
I think arch/$(ARCH)/dts dicretory is a better location
to store both *.dts and *.dtsi files.
For example, before this commit, board/xilinx/dts directory
had both Microblaze dts (microblaze-generic.dts) and
ARM dts (zynq-*.dts), which are totally unrelated.
This commit moves *.dts to arch/$(ARCH)/dts/ directories,
allowing us to describe nicely mutiple DTBs generation in the next commit.
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
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Useful rules in scripts/Makefile.lib allows us to easily
generate a device tree blob and wrap it in assembly code.
We do not need to parse a linker script to get output format and arch.
This commit deletes ./u-boot.dtb since it is a copy of dts/dt.dtb.
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
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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>
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This commit imports build scripts from Linux Kernel v3.13
as they are.
I know they include some trailing spaces
but I am intentionally keeping them untouched.
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
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