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Simon Glass 93b1965322 Makefile: Only build dtc if needed 
At present U-Boot always builds dtc if CONFIG_OF_CONTROL is defined, even
when DTC is provided. The built dtc is not actually used, so this is a
waste of time.

Update the Makefile logic to build dtc only if one is not provided to the
build with the DTC variable. Add documentation to explain this.

This saves about 3.5 seconds of elapsed time on a clean build of
sandbox_spl for me.

Signed-off-by: Simon Glass <sjg@chromium.org>
2021-10-19 11:23:07 -04:00
..
basic WS cleanup: remove SPACE(s) followed by TAB 2021-09-30 09:08:16 -04:00
coccinelle scripts: ensure the cocci script for miiphy_register does not leak the MDIO bus 2021-09-28 18:50:57 +03:00
dtc WS cleanup: remove trailing empty lines 2021-09-30 08:08:56 -04:00
kconfig WS cleanup: remove SPACE(s) followed by TAB 2021-09-30 09:08:16 -04:00
.gitignore docproc: Remove 2018-08-03 19:53:54 -04:00
bin2c.c scripts: import bin2c.c from Linux 4.10-rc6 2017-02-08 15:56:19 -05:00
binutils-version.sh scripts: fix binutils-version.sh for 'as' without a package. 2015-01-08 11:00:45 -05:00
build-whitelist.sh sunxi: Fix CONFIG_SUNXI_GMAC references 2017-09-01 20:48:27 +05:30
build_OID_registry lib: add oid registry utility 2019-12-06 16:44:20 -05:00
check-config.sh scripts/check-config.sh: fix to be compatible with BSD sed 2021-02-24 16:51:48 -05:00
checkpatch.pl scripts/checkpatch.pl: Resync with v5.13 2021-09-01 19:25:37 -04:00
checkstack.pl avr32: Retire AVR32 for good 2017-07-06 16:17:19 -04:00
clang-version.sh kconfig / kbuild: Re-sync with Linux 4.20 2021-07-14 16:57:35 -04:00
cleanpatch Makefile: Move some scripts imported from Linux 2013-12-13 09:18:45 -05:00
coccicheck Makefile: add coccicheck target 2017-11-20 20:18:38 -05:00
config_whitelist.txt configs: Resync with savedefconfig 2021-10-15 09:42:22 -04:00
const_structs.checkpatch checkpatch: update from Linux v4.13-rc6 2017-09-14 21:33:00 -04:00
coreboot.sed SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
decodecode scripts: add decodecode from Linux 2018-05-23 22:06:41 -04:00
documentation-file-ref-check scripts: add documentation-file-ref-check 2020-04-17 12:32:36 -04:00
dtc-version.sh Makefile: Only build dtc if needed 2021-10-19 11:23:07 -04:00
gcc-stack-usage.sh SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
gcc-version.sh kconfig / kbuild: Re-sync with Linux 4.20 2021-07-14 16:57:35 -04:00
gen_ll_addressable_symbols.sh build: remove the variable NM in gen_ll_addressable_symbols.sh 2021-07-28 20:46:34 -04:00
get_default_envs.sh scripts/get_default_envs.sh: Update for thin archive support 2021-07-14 16:57:35 -04:00
get_maintainer.pl get_maintainer.pl: update from Linux kernel v5.13-rc6 2021-07-14 16:57:35 -04:00
Kbuild.include Revert "kbuild: remove unused dtc-version.sh script" 2021-10-19 11:23:07 -04:00
Kconfig.include kconfig: Add scripts/Kconfig.include from v4.19 2020-07-01 10:11:03 -04:00
kernel-doc doc: update Kernel documentation build system 2021-01-27 12:52:57 +01:00
ld-version.sh scripts/ld-version.sh: regular expression compile fails 2017-11-20 20:18:37 -05:00
Lindent scripts/Lindent: import from Linux 3.16 2014-08-21 12:01:29 -04:00
mailmapper scripts/mailmapper: enable running with Python 3 2021-09-28 18:50:55 +03:00
Makefile Makefile: Only build dtc if needed 2021-10-19 11:23:07 -04:00
Makefile.autoconf remove include/config_defaults.h 2020-07-17 10:47:19 -04:00
Makefile.build kconfig / kbuild: Re-sync with Linux 4.20 2021-07-14 16:57:35 -04:00
Makefile.clean kconfig / kbuild: Re-sync with Linux 4.19 2020-04-10 11:18:32 -04:00
Makefile.extrawarn kconfig / kbuild: Re-sync with Linux 4.20 2021-07-14 16:57:35 -04:00
Makefile.host kbuild: cherry-pick kbuild changes from Linux 2020-04-24 16:40:09 -04:00
Makefile.lib kconfig / kbuild: Re-sync with Linux 4.20 2021-07-14 16:57:35 -04:00
Makefile.spl fdt: Update Makefile rules with the new OF_REAL Kconfig 2021-09-25 09:46:15 -06:00
Makefile.uncmd_spl dm: gpio: Allow control of GPIO uclass in SPL 2019-12-15 08:52:29 +08:00
mkmakefile kconfig / kbuild: Re-sync with Linux 4.20 2021-07-14 16:57:35 -04:00
objdiff scripts: objdiff: Ignore debug info when comparing 2017-08-26 14:56:14 -04:00
setlocalversion scripts/setlocalversion: sync with linux 5.8 2020-08-27 15:55:18 -04:00
show-gnu-make SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
spdxcheck.py scripts/checkpatch.pl: Resync with v5.13 2021-09-01 19:25:37 -04:00
spelling.txt scripts/spelling.txt: Sync script with kernel 4.16-rc4 2018-03-05 10:16:30 -05:00