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The prologue of the build system is not specific to Linux or Barebox.
Paritially resync with Linux 5.7-rc4
- In Linux, $(objtree) is always '.', and $(srctree) might be relative.
I am keeping both absolute for now to avoid unexpected breakage.
- I did not resync single target for now. We need to touch
Makefile.build a lot if we want to resync it.
- 'export CDPATH=' is Barebox-only code, which was added by
commit 6cc8d0544658 ("Makefile: disable CDPATH"). Keep it.
- KBUILD_SRC no longer exists in the upstream Linux. I replaced it
with building_out_of_srctree.
- scripts/mkmakefile does not contain anything specific to Linux or
Barebox. Resync it with Linux 5.7-rc4
- scripts/tags was imported from Linux 3.6 with some cherry-picks on
top of that. Resync it with Linux 5.7-rc4
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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The version of mkmakefile which has been used in barebox until now dates
back to commit fd5f0cd6b0cef59ba18e5ac13be5b2775fa6ec28 from the Linux
kernel git history (Tue May 2 12:33:20 2006 +0200).
This patch effectively includes all changes from the aforementioned
commit to the latest stable version of the Linux kernel:
git log --pretty=oneline --abbrev-commit fd5f0cd..v4.10 scripts/mkmakefile
06ed5c2 kbuild: Make scripts executable
9319f45 kbuild: support simultaneous "make %config" and "make all"
0ff3577 kbuild: silence generated makefile message
3c955b4 fixes for using make 3.82
d230124 kbuild: teach mkmakfile to be silent
1d3b3bf kbuild: scripts/mkmakefile: dynamic determination of output directory
971edcf kbuild: re-enable Makefile generation in a new O=... directory
18c32da kbuild: fix building with O=.. options
0b35786 kbuild: call make once for all targets when O=.. is used
In particular, the list of changes includes a fix for the following
Make warning:
Makefile:18: *** mixed implicit and normal rules: deprecated syntax
GNU Make 3.82 raises an error instead of a warning and aborts the
make process. GNU Make 3.82 is still used today by distributions
like Red Hat Enterprise Linux 7.3.
Signed-off-by: Dennis Menschel <menschel-d@posteo.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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build out-of-tree.
Signed-off-by: Robert Schwebel <r.schwebel@pengutronix.de>
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