linux-next: build failure after merge of the kbuild tree

From: Stephen Rothwell
Date: Thu Aug 26 2021 - 05:13:36 EST

Hi all,

After merging the kbuild tree, today's linux-next build (x86_64
allnoconfig) failed like this:

make[2]: *** No rule to make target 'scripts/mod/empty.o', needed by '__build'.

Caused by commit

624a912f84bc ("kbuild: detect objtool changes correctly and remove .SECONDEXPANSION")

(at least, reverting that commit fixes it)

I use a separate object directory and, in this case, it is newly created.

A build with V=1 and -s removed (and no -j) gives this around the

make -f /home/sfr/next/next/scripts/ obj=scripts/mod
make[2]: *** No rule to make target 'scripts/mod/empty.o', needed by '__build'. Stop.
make[1]: *** [/home/sfr/next/next/Makefile:1309: prepare0] Error 2

I have reverted that commit for today.
Stephen Rothwell

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