Commit da541b20 authored Sep 27, 2017 by Josh Poimboeuf Committed by Ingo Molnar Sep 28, 2017

objtool: Skip unreachable warnings for GCC 4.4 and older



The kbuild bot occasionally reports warnings like:

  drivers/scsi/pcmcia/aha152x_core.o: warning: objtool: seldo_run()+0x130: unreachable instruction

These warnings are always with GCC 4.4.  That version of GCC sometimes
places unreachable instructions after calls to noreturn functions.

The unreachable warnings aren't very important anyway.  Just ignore them
for old versions of GCC.

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/bc89b807d965b98ec18a0bb94f96a594bd58f2f2.1506551639.git.jpoimboe@redhat.com


Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent 9cd6681c

scripts/Makefile.build

+2 −0

Original line number	Diff line number	Diff line
		@@ -265,6 +265,8 @@ objtool_args += --no-fp
		endif
		ifdef CONFIG_GCOV_KERNEL
		objtool_args += --no-unreachable
		else
		objtool_args += $(call cc-ifversion, -lt, 0405, --no-unreachable)
		endif

		# 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory

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