On Wed, Feb 10, 2021 at 09:52:42AM -0800, Andrii Nakryiko wrote:

On Wed, Feb 10, 2021 at 9:47 AM Nathan Chancellor [off-list ref] wrote:

quoted

On Fri, Feb 05, 2021 at 01:40:20PM +0100, Jiri Olsa wrote:

quoted

The resolve_btfids tool is used during the kernel build,
so we should clean it on kernel's make clean.

Invoking the the resolve_btfids clean as part of root
'make clean'.

Acked-by: Song Liu <redacted>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 Makefile | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index b0e4767735dc..159d9592b587 100644
--- a/Makefile
+++ b/Makefile

@@ -1086,6 +1086,11 @@ ifdef CONFIG_STACK_VALIDATION
   endif
 endif

+PHONY += resolve_btfids_clean
+
+resolve_btfids_clean:
+     $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(abspath $(objtree))/tools/bpf/resolve_btfids clean
+
 ifdef CONFIG_BPF
 ifdef CONFIG_DEBUG_INFO_BTF
   ifeq ($(has_libelf),1)

@@ -1495,7 +1500,7 @@ vmlinuxclean:
      $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
      $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)

-clean: archclean vmlinuxclean
+clean: archclean vmlinuxclean resolve_btfids_clean

 # mrproper - Delete all generated files, including .config
 #
--

2.26.2

This breaks running distclean on a clean tree (my script just
unconditionally runs distclean regardless of the tree state):

$ make -s O=build distclean
../../scripts/Makefile.include:4: *** O=/home/nathan/cbl/src/linux-next/build/tools/bpf/resolve_btfids does not exist.  Stop.

Can't reproduce it. It works in all kinds of variants (relative and
absolute O=, clean and not clean trees, etc). Jiri, please check as
well.

I can reproduce if I set O=XXX to directory that does not contain kernel build

	$ mkdir /tmp/krava
	$ make O=/tmp/krava distclean
	make[1]: Entering directory '/tmp/krava'
	../../scripts/Makefile.include:4: *** O=/tmp/krava/tools/bpf/resolve_btfids does not exist.  Stop.
	make[1]: *** [/home/jolsa/linux/Makefile:1092: resolve_btfids_clean] Error 2
	make[1]: Leaving directory '/tmp/krava'
	make: *** [Makefile:185: __sub-make] Error 2

will check on fix

jirka