Hello Simon
Further to this one - here is my full buildman output. There are a few PPC problems also:
Your close check is highly appreciated. Thanks!
29: Makefile: move more flags to the top Makefile powerpc: + rainier_nand glacier_nand canyonlands_nand sequoia_nand haleakala_nand kilauea_nand acadia_nand bamboo_nand 30: Makefile: refactor include path settings 31: Makefile: move more stuff to top Makefile powerpc: rainier_nand glacier_nand canyonlands_nand sequoia_nand haleakala_nand kilauea_nand acadia_nand bamboo_nand
It looks like nand_spl boards are broken at 29 and fixed at 31.
I will fix this problem at v2.
34: Kbuild: change out-of-tree building sandbox: + sandbox blackfin: bf561-acvilon cm-bf537u 35: Kbuild: add dummy obj-y to create built-in.o 36: Makefile: rename scripts/Makefile.build to scripts/Makefile.build.tmp 37: Kbuild: import more build scripts from Linux v3.12 tag 38: Kbuild: use Linux Kernel build scripts sandbox: sandbox blackfin: + bf561-acvilon cm-bf537u
Sandbox is broken at 34 and fixed at 38.
I will fix this problem too at v2.
buildman is also reporting something about bf561-acvilon and cm-bf537u. But as long as I tested, I believe it is unrelated to Kbuild.
Sonic Zhang posted some patches to fix errors/warnings of Blackfin boards. Please check this again after u-boot-blackfin/mater is merged.
What will happen with the 'FIX ME's that are generated? e.g.:
I mentioned about My Next Plan in this covor letter. I want to refactor more makefiles lator including such as "FIX ME" or "TODO" items.
+# FIX ME +ifneq ($(filter lib lib/lzma lib/zlib, $(obj)),) +ccflags-y := -O2 +endif
I was thinking to do something about this after Kconfig.
Some Blackfin, M68K boards want to compile lib, lib/lzma, lib/zlib with -O2 option and other sources with -Os option.
I think this feature is WANT, not MUST.
If this feature deserves maintainance, how about adding new CONFIG macro like this?
config CC_OPTIMIZE_LIBS_FOR_SPEED bool "Optimize libraries for speed" help Enabling this option will pass "-O2" when compiling C sources under lib/ directory even if -Os is given to the whole sources. If unsure, say N.
And add the following line to lib/Makefile.
subdir-ccflags-$(CONFIG_OPTIMIZE_LIBS_FOR_SPEED) += -O2
Have you done any comparison on build times?
Do you mean Kbuild is slower than U-Boot conventional build system?
Best Regards Masahiro Yamada