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Based on the following Linux commits:
- 54a702f70589 ("kbuild: mark $(targets) as .SECONDARY and remove
.PRECIOUS markers")
- 8e9b61b293d9 ("kbuild: move .SECONDARY special target to
Kbuild.include")
GNU Make automatically deletes intermediate files that are updated
in a chain of pattern rules.
Example 1) %.dtb.o <- %.dtb.S <- %.dtb <- %.dts
Example 2) %.o <- %.c <- %.c_shipped
A couple of makefiles mark such targets as .PRECIOUS to prevent Make
from deleting them, but the correct way is to use .SECONDARY.
.SECONDARY
Prerequisites of this special target are treated as intermediate
files but are never automatically deleted.
.PRECIOUS
When make is interrupted during execution, it may delete the target
file it is updating if the file was modified since make started.
If you mark the file as precious, make will never delete the file
if interrupted.
Both can avoid deletion of intermediate files, but the difference is
the behavior when Make is interrupted; .SECONDARY deletes the target,
but .PRECIOUS does not.
The use of .PRECIOUS is relatively rare since we do not want to keep
partially constructed (possibly corrupted) targets.
.SECONDARY with no prerequisites causes all targets to be treated as
secondary. This agrees the policy of Kbuild.
scripts/Kbuild.include seems a suitable place to add it because it is
included from almost all sub-makes.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
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Align Kconfig to Linux 4.17-rc4 with minimal impact on non-kconfig files.
Previous Kconfig sync was done by commit bf7ab1e70fd762 ("kconfig:
re-sync with Linux 4.10") and it achieved almost perfect alignment with
a few (intended) exceptions, caused by below U-boot commits:
[A] v2015.04 5f9eb2207500 ("kbuild: remove scripts/multiconfig.sh")
[B] v2015.07 20c20826efab ("Kconfig: Enable usage of escape char '\' in string values")
[C] v2016.01 da58dec86616 ("Various Makefiles: Add SPDX-License-Identifier tags")
[D] v2016.03 5b8031ccb4ed ("Add more SPDX-License-Identifier tags")
[E] v2016.03 192bc6948b02 ("Fix GCC format-security errors and convert sprintfs.")
Here is the list of Kconfig commits which followed the v4.10 alignment:
[F] v2018.01 0931ed3c0d0f ("kconfig/symbol.c: use correct pointer type argument for sizeof")
[G] v2018.03 1414e09b4f25 ("kconfig: revert change that was not needed for -Wformat-security")
[H] v2018.05 83d290c56fab ("SPDX: Convert all of our single license tags to Linux Kernel style")
Commit [F] was subsequently applied to Linux kernel as commit [I]
with the same patch id, so it won't contribute to further misalignment.
[I] v4.15-rc1 88127dae6ed9 ("kconfig/symbol.c: use correct pointer type argument for sizeof")
Commit [G] is a Kconfig-specific revert of commit [E].
Commit [H] relocated and reformatted the license doing no functional change.
In summary, the only functional change that makes U-boot Kconfig
diverge from Linux Kconfig is commit [B]. After a brief analysis,
the purpose of [B] seems to be placing "\n" literals in string symbols
like CONFIG_AUTOBOOT_PROMPT="autoboot in %d seconds\n" in order to pass
them directly to printf and expect correct output at runtime. Currently,
Linux doesn't seem to have this requirement, so for the moment [B] looks
like a U-boot specific feature/fix. From point of view of further Kconfig
alignment and backporting efforts, it is highly desired that commits
like [B] are propagated to Linux and any Kconfig fixes/features are
contributed to Linux kernel first. This specific Kconfig re-sync just
keeps [B] in place.
Contrary to 4.10 Kconfig re-sync (which achieves zero non-kconfig
changes), 4.17-rc4 re-sync does some amount of updates in Kbuild
(striving to keep them at minimum), due to a number of reasons:
* Kbuild is affected by the removal of Kconfig "*shipped" files and now
requires flex and bison pre-installed on the host.
* PYTHON{2,3} variables are defined in top-level Makefile as
prerequisite for running the newly developed Kconfig unit tests.
* silentoldconfig becomes an "internal implementation detail" deprecated
for external use, being renamed to syncconfig.
The exact non-kconfig files touched by this commit are:
$ git show --format="" --stat -- ':!scripts/kconfig'
.gitignore | 2 ++
Makefile | 9 +++++++--
scripts/Makefile.build | 11 +++++++++++
scripts/Makefile.lib | 41 ++++++++++++-----------------------------
The imported Linux commits touching the above files are:
c054be10ffdbd5 ("remove gperf left-overs from build system")
73a4f6dbe70a1b ("kbuild: add LEX and YACC variables")
033dba2ec06c47 ("kbuild: prepare to remove C files pre-generated by flex and bison")
eea199b445f64c ("kbuild: remove unnecessary LEX_PREFIX and YACC_PREFIX")
e71de5ee08dcb0 ("kbuild: remove remaining use of undefined YACC_PREFIX")
d59fbbd09d5d6b ("kbuild: replace hardcoded bison in cmd_bison_h with $(YACC)")
911a91c39cabcb H ("kconfig: rename silentoldconfig to syncconfig")
59889300274569 (".gitignore: move *.lex.c *.tab.[ch] patterns to the top-level .gitignore")
9a8dfb394c0467 ("kbuild: clean up *.lex.c and *.tab.[ch] patterns from top-level Makefile")
833e622459432e H ("genksyms: generate lexer and parser during build instead of shipping")
b23d1a241f4eb4 H ("kbuild: add %.lex.c and %.tab.[ch] to 'targets' automatically")
e9781b52d4e0e3 H ("kbuild: add PYTHON2 and PYTHON3 variables")
The commits marked with 'H' are assessed as "hard" (build will fail)
prerequisites and the rest of them are assessed as "soft" prerequisites
for the re-sync. In spite of relatively high number of non-H commits,
they belong to this Kconfig update topic-wise and decrease the number of
cherry pick conflicts for many commits in this series. Additional effort
can be put in eliminating the soft prerequisites, if really needed.
The commits which contributed to this Kconfig re-sync are listed below.
Whenever a conflict resolution has been performed (mostly by hand, but
sometimes automatically by git), it is revealed by the '!' sign in the
second column, which means a patch id mismatch between Linux and U-boot
commits:
9be3213b14d44f ("gconfig: remove misleading parentheses around a condition")
ff85a1a80e0034 ("kconfig: Check for libncurses before menuconfig")
ad8181060788c8 ("kconfig: fix sparse warnings in nconfig")
cb77f0d623ff33 ! ("scripts: Switch to more portable Perl shebang")
bb3290d91695bb ! ("Remove gperf usage from toolchain")
c054be10ffdbd5 ("remove gperf left-overs from build system")
b24413180f5600 ! ("License cleanup: add SPDX GPL-2.0 license identifier to files with no license")
9059a3493efea6 ! ("kconfig: fix relational operators for bool and tristate symbols")
2c37e08464a850 ("kconfig: Warn if choice default is not in choice")
33ca1a24866373 ("kconfig: Document the 'menu' struct")
52aede4ba5efd1 ("kconfig: Document the 'symbol' struct")
c873443430ebd1 ("kconfig: Sync zconf.y with zconf.tab.c_shipped")
9a826842ff2fbd ("kconfig: Rename menu_check_dep() to rewrite_m()")
fa8cedaef814ce ("kconfig: Clarify expression rewriting")
f77850d3fe0c96 ("kconfig: Clean up modules handling and fix crash")
e3b03bf29d6b99 ("kconfig: display recursive dependency resolution hint just once")
73a4f6dbe70a1b ! ("kbuild: add LEX and YACC variables")
033dba2ec06c47 ! ("kbuild: prepare to remove C files pre-generated by flex and bison")
29c833061c1d8c ("kconfig: generate lexer and parser during build instead of shipping")
26e47a3c11a25c ("kconfig: Don't leak symbol names during parsing")
24161a6711c945 ("kconfig: Don't leak 'source' filenames during parsing")
bc28fe1d5ede88 ("kconfig: Don't leak 'option' arguments during parsing")
0724a7c32a54e3 ("kconfig: Don't leak main menus during parsing")
ae7440ef0c8013 ("kconfig: Fix automatic menu creation mem leak")
5b1374b3b3c2fc ("kconfig: Fix expr_free() E_NOT leak")
7cf33f88e29410 ("kconfig: Fix choice symbol expression leak")
05cccce580456d ("kconfig: Document automatic submenu creation code")
0735f7e5def2ab ("kconfig: Document important expression functions")
df60f4b92d3d0b ("kconfig: Remove menu_end_entry()")
b92d804a51796b ("kconfig: drop 'boolean' keyword")
6479f327dea60d ("kconfig: Warn if there is more than one help text")
52e58a3caeba5d ("kconfig: make input_mode static")
5a3dc717b3c785 ("kconfig: make xfgets() really static")
84dd95d4f87a0d ("kconfig: make conf_unsaved a local variable of conf_read()")
765f4cdef6f80d ("kconfig: use default 'yy' prefix for lexer and parser")
eea199b445f64c ("kbuild: remove unnecessary LEX_PREFIX and YACC_PREFIX")
e71de5ee08dcb0 ("kbuild: remove remaining use of undefined YACC_PREFIX")
d59fbbd09d5d6b ! ("kbuild: replace hardcoded bison in cmd_bison_h with $(YACC)")
3e41ba05b6d60c ("kconfig: Document SYMBOL_OPTIONAL logic")
d3465af60f4471 ("kconfig: Clarify choice dependency propagation")
9d1a9e8bc18bea ("kconfig: Document 'if' flattening logic")
b53688014e3325 ("kconfig: Clarify menu and 'if' dependency propagation")
d0fd0428ecf04b ("kconfig: fix make xconfig when gettext is missing")
312ee68752faaa ("kconfig: announce removal of oldnoconfig if used")
1ccb27143360bd ("kconfig: make "Selected by:" and "Implied by:" readable")
cedd55d49dee94 ! ("kconfig: Remove silentoldconfig from help and docs; fix kconfig/conf's help")
1b9eda2e4892cb ("kconfig: Warn if help text is blank")
cb67ab2cd2b8ab ("kconfig: do not write choice values when their dependency becomes n")
4f208f392103e8 ("kconfig: show '?' prompt even if no help text is available")
cd58a91def2acc ("kconfig: remove 'config*' pattern from .gitignnore")
d2a04648a5dbc3 ("kconfig: remove check_stdin()")
f3ff6fb5db68bc ("kconfig: echo stdin to stdout if either is redirected")
9e3e10c725360b ("kconfig: send error messages to stderr")
d717f24d8c6808 ("kconfig: add xrealloc() helper")
523ca58b7db2e3 ("kconfig: remove const qualifier from sym_expand_string_value()")
cd81fc82b93fa4 ("kconfig: add xstrdup() helper")
f4bc1eefc1608e ("kconfig: set SYMBOL_AUTO to the symbol marked with defconfig_list")
bf0bbdcf100322 ("kconfig: Don't leak choice names during parsing")
1a90ce36c6eff6 ("kconfig: Update ncurses package names for menuconfig")
5ae6fcc4bb82bd ("kconfig: fix line number in recursive inclusion error message")
07a422bb213adb ! ("kbuild: restore autoksyms.h touch to the top Makefile")
9a47ceec543bfb ("kconfig: clean-up reverse dependency help implementation")
d9119b5925a03b ("kconfig: Print reverse dependencies in groups")
f467c5640c29ad ("kconfig: only write '# CONFIG_FOO is not set' for visible symbols")
59a80b5e892dde ("kconfig: do not call check_conf() for olddefconfig")
4bb3a5b085cd6f ("kconfig: remove unneeded input_mode test in conf()")
99f0b6578bab44 ("kconfig: remove redundant input_mode test for check_conf() loop")
2aad9b89621386 ("kconfig: hide irrelevant sub-menus for oldconfig")
81d2bc2273052e ("kconfig: invoke oldconfig instead of silentoldconfig from local*config")
911a91c39cabcb ! ("kconfig: rename silentoldconfig to syncconfig")
2a61625835c7c8 ! ("kconfig: remove redundant streamline_config.pl prerequisite")
022a4bf6b59dfd ("kconfig: tests: add framework for Kconfig unit testing")
1903c511905984 ("kconfig: tests: add basic choice tests")
49ac3c0c3aa3b7 ("kconfig: tests: test automatic submenu creation")
b76960c0f6b25d ("kconfig: tests: test if new symbols in choice are asked")
930c429a656fdb ("kconfig: tests: check unneeded "is not set" with unmet dependency")
ee236610653ede ("kconfig: tests: check visibility of tristate choice values in y choice")
beaaddb625400e ("kconfig: tests: test defconfig when two choices interact")
3e4888c2e3d77d ("kconfig: tests: test randconfig for choice in choice")
29c434f367ea7b ("kconfig: tests: test if recursive dependencies are detected")
e2c75e7667c737 ("kconfig: tests: test if recursive inclusion is detected")
f622f827958162 ("kconfig: warn unmet direct dependency of tristate symbols selected by y")
f8f69dc0b4e070 ("kconfig: make unmet dependency warnings readable")
26561514cc9def ("kconfig: do not include both curses.h and ncurses.h for nconfig")
32a94b8b0c3e5a ("kconfig: remove duplicated file name and lineno of recursive inclusion")
379a8eb8eb1a55 ("kconfig: detect recursive inclusion earlier")
18492685e479fd ("kconfig: use yylineno option instead of manual lineno increments")
59889300274569 ! (".gitignore: move *.lex.c *.tab.[ch] patterns to the top-level .gitignore")
9a8dfb394c0467 ! ("kbuild: clean up *.lex.c and *.tab.[ch] patterns from top-level Makefile")
833e622459432e ! ("genksyms: generate lexer and parser during build instead of shipping")
b23d1a241f4eb4 ! ("kbuild: add %.lex.c and %.tab.[ch] to 'targets' automatically")
17baab68d337a0 ("kconfig: extend output of 'listnewconfig'")
e9781b52d4e0e3 ! ("kbuild: add PYTHON2 and PYTHON3 variables")
The current Kconfig update generates below build-time warnings:
YACC scripts/dtc/dtc-parser.tab.h
scripts/dtc/dtc-parser.y: warning: 3 shift/reduce conflicts [-Wconflicts-sr]
YACC scripts/dtc/dtc-parser.tab.c
scripts/dtc/dtc-parser.y: warning: 3 shift/reduce conflicts [-Wconflicts-sr]
This seems to happen because the Kbuild updates apparently didn't make
room for both "*shipped"-based builds and flex/bison-based builds. A
similar problem has been reported for genksyms parser in v4.17-rc1
commit 833e622459432e ("genksyms: generate lexer and parser during build
instead of shipping"). I have figured out empirically that the warnings
are healed after updating the in-tree U-boot DTC to upstream v1.4.6-9,
same as done by Linux v4.17-rc1 commit 9130ba88464032 ("scripts/dtc:
Update to upstream version v1.4.6-9-gaadd0b65c987"). Whether fixing the
DTC-related yacc warnings should be done together with the Kconfig
re-sync, I would like to hear from community.
My testing was limited to:
- make defconfig all
- make ARCH=arm CROSS_COMPILE=aarch64-linux-gnu- r8a7795_ulcb_defconfig all
- comparing .config before and after the re-sync
- running the newly imported Kconfig unit tests as seen below:
$ make testconfig
Tested-by: Petr Vorel <petr.vorel@gmail.com>
============================= test session starts =============================
scripts/kconfig/tests/auto_submenu/__init__.py::test PASSED [ 7%]
scripts/kconfig/tests/choice/__init__.py::test_oldask0 PASSED [ 14%]
scripts/kconfig/tests/choice/__init__.py::test_oldask1 PASSED [ 21%]
scripts/kconfig/tests/choice/__init__.py::test_allyes PASSED [ 28%]
scripts/kconfig/tests/choice/__init__.py::test_allmod PASSED [ 35%]
scripts/kconfig/tests/choice/__init__.py::test_allno PASSED [ 42%]
scripts/kconfig/tests/choice/__init__.py::test_alldef PASSED [ 50%]
scripts/kconfig/tests/choice_value_with_m_dep/__init__.py::test PASSED [ 57%]
scripts/kconfig/tests/err_recursive_inc/__init__.py::test PASSED [ 64%]
scripts/kconfig/tests/inter_choice/__init__.py::test PASSED [ 71%]
scripts/kconfig/tests/new_choice_with_dep/__init__.py::test PASSED [ 78%]
scripts/kconfig/tests/no_write_if_dep_unmet/__init__.py::test PASSED [ 85%]
scripts/kconfig/tests/rand_nested_choice/__init__.py::test PASSED [ 92%]
scripts/kconfig/tests/warn_recursive_dep/__init__.py::test PASSED [100%]
========================== 14 passed in 0.34 seconds ==========================
Signed-off-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Reviewed-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Tested-by: Petr Vorel <petr.vorel@gmail.com>
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When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from. So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry. Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.
In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.
This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents. There's also a few places where I found we did not have a tag
and have introduced one.
Signed-off-by: Tom Rini <trini@konsulko.com>
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A general best practice for SPDX is that Makefiles should have an
identifier, add these as everything else is currently covered.
Signed-off-by: Tom Rini <trini@konsulko.com>
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Update some build scripts to match Linux 4.1. Commit-based syncing
was done so as not to break U-Boot specific changes.
The previous big sync was from Linux 3.18-rc1 by commit 176d09827725
(kbuild: sync misc scripts with Linux 3.18-rc1).
The commits imported from Linux (some with adjustments) are:
[1] commit 9fb5e5372208973984a23ee6f5f025c05d364633
Author: Robert Richter <rrichter@cavium.com>
dts, kbuild: Factor out dtbs install rules to Makefile.dtbinst
[2] commit 371fdc77af44f4cb32475fd499e1d912ccc30890
Author: Masahiro Yamada <yamada.m@jp.panasonic.com>
kbuild: collect shorthands into scripts/Kbuild.include
[3] commit a29b82326ed4eb5567b03c85b52c6891578d5a03
Author: Michal Marek <mmarek@suse.cz>
kbuild: Remove duplicate $(cmd) definition in Makefile.clean
[4] commit 1846dfbde3e8a53f3673dcb1c1b79fd9b3f8d40d
Author: Masahiro Yamada <yamada.m@jp.panasonic.com>
kbuild: remove redundant -rR flag of hdr-inst
[5] commit 34948e0bbf98640fc1821751b01d2f0cd17d84d5
Author: Michal Marek <mmarek@suse.cz>
kbuild: Drop support for clean-rule
[6] commit a16c5f99a28c9945165c46da27fff8e6f26f8736
Author: Michal Marek <mmarek@suse.cz>
kbuild: Fix removal of the debian/ directory
[7] commit d0d38cd9e853db11e0242b3df4c9c3c4a663fbb4
Author: Masahiro Yamada <yamada.m@jp.panasonic.com>
kbuild: use mixed-targets when two or more config targets are given
[8] commit dd33c03b18b3f2db791eb6a17c37d2de66e4de18
Author: Masahiro Yamada <yamada.m@jp.panasonic.com>
kbuild: fix cc-ifversion macro
[9] commit 665d92e38f65d70796aad2b8e49e42e80815d4a4
Author: Masahiro Yamada <yamada.m@jp.panasonic.com>
kbuild: do not add $(call ...) to invoke cc-version or cc-fullversion
[10] commit 6dcb4e5edf39e3b65a75ca76f087b2fdbee8a808
Author: Masahiro Yamada <yamada.m@jp.panasonic.com>
kbuild: allow cc-ifversion to have the argument for false condition
[11] commit c0a80c0c27e5e65b180a25e6c4c2f7ef9e386cd3
Author: Heiko Carstens <heiko.carstens@de.ibm.com>
ftrace: allow architectures to specify ftrace compile options
[12] commit 0b24becc810dc3be6e3f94103a866f214c282394
Author: Andrey Ryabinin <a.ryabinin@samsung.com>
kasan: add kernel address sanitizer infrastructure
[13] commit 4218affdf57f938c04e3a916a9685ee27079f377
Author: Masahiro Yamada <yamada.m@jp.panasonic.com>
kbuild: remove warning about "make depend"
[14] commit 77479b38e2f58890eb221a0418357502a5b41cd6
Author: Nathan Rossi <nathan.rossi@xilinx.com>
kbuild: Create directory for target DTB
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Signed-off-by: Robert Richter <rrichter@cavium.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrey Ryabinin <a.ryabinin@samsung.com>
Signed-off-by: Nathan Rossi <nathan.rossi@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Michal Marek <mmarek@suse.cz>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
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When Kconfig for U-boot was examined, one of the biggest issues was
how to support multiple images (Normal, SPL, TPL). There were
actually two options, "single .config" and "multiple .config".
After some discussions and thought experiments, I chose the latter,
i.e. to create ".config", "spl/.config", "tpl/.config" for Normal,
SPL, TPL, respectively.
It is true that the "multiple .config" strategy provided us the
maximum flexibility and helped to avoid duplicating CONFIGs among
Normal, SPL, TPL, but I have noticed some fatal problems:
[1] It is impossible to share CONFIG options across the images.
If you change the configuration of Main image, you often have to
adjust some SPL configurations correspondingly. Currently, we
cannot handle the dependencies between them. It means one of the
biggest advantages of Kconfig is lost.
[2] It is too painful to change both ".config" and "spl/.config".
Sunxi guys started to work around this problem by creating a new
configuration target. Commit cbdd9a9737cc (sunxi: kconfig: Add
%_felconfig rule to enable FEL build of sunxi platforms.) added
"make *_felconfig" to enable CONFIG_SPL_FEL on both images.
Changing the configuration of multiple images in one command is a
generic demand. The current implementation cannot propose any
good solution about this.
[3] Kconfig files are getting ugly and difficult to understand.
Commit b724bd7d6349 (dm: Kconfig: Move CONFIG_SYS_MALLOC_F_LEN to
Kconfig) has sprinkled "if !SPL_BUILD" over the Kconfig files.
[4] The build system got more complicated than it should be.
To adjust Linux-originated Kconfig to U-Boot, the helper script
"scripts/multiconfig.sh" was introduced. Writing a complicated
text processor is a shell script sometimes caused problems.
Now I believe the "single .config" will serve us better. With it,
all the problems above would go away. Instead, we will have to add
some CONFIG_SPL_* (and CONFIG_TPL_*) options such as CONFIG_SPL_DM,
but we will not have much. Anyway, this is what we do now in
scripts/Makefile.spl.
I admit my mistake with my apology and this commit switches to the
single .config configuration.
It is not so difficult to do that:
- Remove unnecessary processings from scripts/multiconfig.sh
This file will remain for a while to support the current defconfig
format. It will be removed after more cleanups are done.
- Adjust some makefiles and Kconfigs
- Add some entries to include/config_uncmd_spl.h and the new file
scripts/Makefile.uncmd_spl. Some CONFIG options that are not
supported on SPL must be disabled because one .config is shared
between SPL and U-Boot proper going forward. I know this is not
a beautiful solution and I think we can do better, but let's see
how much we will have to describe them.
- update doc/README.kconfig
More cleaning up patches will follow this.
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
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This commit imports some updates in misc scripts from Linux 3.18-rc1.
[1] commit cbb4d3e6510b99522719c5ef0 by Horia Geanta
scripts/kernel-doc: handle object-like macros
[2] commit 164f0d2efaaef83 by Michal Marek
kbuild: Fix handling of backslashes in *.cmd files
[3] commit 270a00963cd367214e by Randy Dunlap
scripts/kernel-doc: recognize __meminit
[4] commit a4954fd7724c0f55361eb5 by Masahiro Yamada
kbuild: remove obj-n and lib-n handling
[5] commit 5b2389b45d1a9c12b9f by Masahiro Yamada
kbuild: simplify build, clean, modbuiltin shorthands
Signed-off-by: Horia Geanta <horia.geanta@freescale.com>
Signed-off-by: Michal Marek <mmarek@suse.cz>
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
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Since Linux 3.18-rc1, Kbuild is able to handle multi-objs
dependency correctly, which also allows us futher cleanups
of some makefiles.
This commit imports those commits:
[1] commit c8589d1e9e01 by Masahiro Yamada
kbuild: handle multi-objs dependency appropriately
[2] commit 97e3226e6e98 by Masahiro Yamada
kbuild: handle the dependency of multi-objs hostprogs appropriately
[3] commit 022af62d0190 by Masahiro Yamada
kbuild: refactor script/kconfig/Makefile
[4] commit 221ecca6cafe by Masahiro Yamada
kbuild: remove redundant clean-files from scripts/kconfig/Makefile
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
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This commit was imported from Linux Kernel:
commit a86fe353 written by me.
W=... provides extra gcc checks.
Having such code in scripts/Makefile.build results in the same flags
being added to KBUILD_CFLAGS multiple times becuase
scripts/Makefile.build is invoked every time Kbuild descends into
the subdirectories.
Since the top Makefile is already too cluttered, this commit moves
all of extra gcc check stuff to a new file scripts/Makefile.extrawarn,
which is included from the top Makefile.
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
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This commit enables Kconfig.
Going forward, we use Kconfig for the board configuration.
mkconfig will never be used. Nor will include/config.mk be generated.
Kconfig must be adjusted for U-Boot because our situation is
a little more complicated than Linux Kernel.
We have to generate multiple boot images (Normal, SPL, TPL)
from one source tree.
Each image needs its own configuration input.
Usage:
Run "make <board>_defconfig" to do the board configuration.
It will create the .config file and additionally spl/.config, tpl/.config
if SPL, TPL is enabled, respectively.
You can use "make config", "make menuconfig" etc. to create
a new .config or modify the existing one.
Use "make spl/config", "make spl/menuconfig" etc. for spl/.config
and do likewise for tpl/.config file.
The generic syntax of configuration targets for SPL, TPL is:
<target_image>/<config_command>
Here, <target_image> is either 'spl' or 'tpl'
<config_command> is 'config', 'menuconfig', 'xconfig', etc.
When the configuration is done, run "make".
(Or "make <board>_defconfig all" will do the configuration and build
in one time.)
For futher information of how Kconfig works in U-Boot,
please read the comment block of scripts/multiconfig.py.
By the way, there is another item worth remarking here:
coexistence of Kconfig and board herder files.
Prior to Kconfig, we used C headers to define a set of configs.
We expect a very long term to migrate from C headers to Kconfig.
Two different infractructure must coexist in the interim.
In our former configuration scheme, include/autoconf.mk was generated
for use in makefiles.
It is still generated under include/, spl/include/, tpl/include/ directory
for the Normal, SPL, TPL image, respectively.
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Acked-by: Simon Glass <sjg@chromium.org>
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Import the following trivial commits from Linux v3.16-rc1:
bb66fc6 kbuild: trivial - use tabs for code indent where possible
7eb6e34 kbuild: trivial - remove trailing empty lines
3fbb43d kbuild: trivial - fix comment block indent
38385f8 kbuild: trivial - remove trailing spaces
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
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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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This commit changes the location of include directives
of board configuration files.
The purpose of this change is:
- Slim down $(TOPDIR)/config.mk
- Prevent $(TOPDIR)/Makefile from including the same
configuration file twice
- Do not include include/config.mk multiple times
because ARCH, CPU, BOARD, VENDOR, SOC are exported
Before this commit:
- include/autoconf.mk was included from $(TOPDIR)/Makefile
and $(TOPDIR)/config.mk
(This means $(TOPDIR)/Makefile included include/autoconf.mk twice)
- include/{spl,tpl}-autoconf.mk was included from $(TOPDIR)/config.mk
- include/config.mk was included from $(TOPDIR)/Makefile
and $(TOPDIR)/config.mk
(This means $(TOPDIR)/Makefile included include/config.mk twice)
After this commit:
- include/autoconf.mk is included from $(TOPDIR)/Makefile
and $(TOPDIR)/scripts/Makefile.build
- include/{spl,tpl}-autoconf.mk is included from $(TOPDIR)/spl/Makefile
and $(TOPDIR)/scripts/Makefile.build
- include/config.mk is included from $(TOPDIR)/config.mk and
$(TOPDIR)/spl/Makefile
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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Some build scripts including scripts/Makefile.build
will be imported from Linux Kernel in the next commit.
We need to adjust them for U-Boot in the following commits.
To make it easier for reviewers to track the modification,
this commit renames scripts/Makefile.build to
scripts/Makefile.build.tmp beforehand.
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
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This commit changes the working directory
where the build process occurs.
Before this commit, build process occurred under the source
tree for both in-tree and out-of-tree build.
That's why we needed to add $(obj) prefix to all generated
files in makefiles like follows:
$(obj)u-boot.bin: $(obj)u-boot
Here, $(obj) is empty for in-tree build, whereas it points
to the output directory for out-of-tree build.
And our old build system changes the current working directory
with "make -C <sub-dir>" syntax when descending into the
sub-directories.
On the other hand, Kbuild uses a different idea
to handle out-of-tree build and directory descending.
The build process of Kbuild always occurs under the output tree.
When "O=dir/to/store/output/files" is given, the build system
changes the current working directory to that directory and
restarts the make.
Kbuild uses "make -f $(srctree)/scripts/Makefile.build obj=<sub-dir>"
syntax for descending into sub-directories.
(We can write it like "make $(obj)=<sub-dir>" with a shorthand.)
This means the current working directory is always the top
of the output directory.
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Tested-by: Gerhard Sittig <gsi@denx.de>
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This commit adjusts some files to use Kbuild.include.
- Use cc-option defined in Kbuild.include
(Delete cc-option in config.mk)
- Use cc-version defined in
(Delete cc-version in config.mk)
- Move binutils-version and dtc-version to Kbuild.include
by analogy to cc-version
This commit also adds srctree (same as SRCTREE)
to use Kbuild scripts.
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
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This commit moves suffix rules from config.mk
to scripts/Makefile.build, which will allow us
to switch smoothly to real Kbuild.
Note1:
post/lib_powerpc/fpu/Makefile has
its own rule to compile C sources.
We need to tweak it to keep the same behavior.
Note2:
There are two file2 with the same name:
arch/arm/lib/crt0.S and eamples/api/crt0.S.
To keep the same build behavior,
examples/api/Makefile also has to be treaked.
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
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Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
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This commit adds scripts/Makefile.host.tmp which will
be used in the next commit to convert makefiles
under tools/ directory to Kbuild style.
Notice this script, scripts/Makefile.host.tmp
is temporary.
When switching over to real Kbuild,
it will be replaced with scripts/Makefile.host of Linux Kernel.
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
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Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
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The support for COBJS, COBJS-y, SOBJS, SOBJS-y, GLCOBJS, GLSOBJS
from scripts/Makefile.build.
Going forward we need to use Kbuild style consistently.
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
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This patch tweaks scripts/Makefile.build to allow
the build system to descend into subdirectories like Kbuild.
To use this feature, use "obj-y += foo/" syntax.
Example:
obj-$(CONFIG_FOO) += foo/
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Simon Glass <sjg@chromium.org>
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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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