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objtool: Upgrade libelf-devel warning to error for CONFIG_ORC_UNWINDER

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With CONFIG_ORC_UNWINDER, if the user doesn't have libelf-devel
installed, and they don't see the make warning, their ORC unwinder will
be silently broken.  Upgrade the warning to an error.

Reported-and-tested-by: Borislav Petkov <[email protected]>
Signed-off-by: Josh Poimboeuf <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: http://lkml.kernel.org/r/d9dfc39fb8240998820f9efb233d283a1ee96084.1507079417.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Josh Poimboeuf 2017-10-03 20:10:36 -05:00 • committed by Ingo Molnar
commit 3dd40cb320
1 changed files with 5 additions and 1 deletions
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6
Makefile
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@ -933,7 +933,11 @@ ifdef CONFIG_STACK_VALIDATION
ifeq ($(has_libelf),1)
objtool_target := tools/objtool FORCE
else
$(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
ifdef CONFIG_ORC_UNWINDER
$(error "Cannot generate ORC metadata for CONFIG_ORC_UNWINDER=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
else
$(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
endif
SKIP_STACK_VALIDATION := 1
export SKIP_STACK_VALIDATION
endif