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objtool: Allow AR to be overridden with HOSTAR

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Currently, this Makefile hardcodes GNU ar, meaning that if it is not
available, there is no way to supply a different one and the build will
fail.

  $ make AR=llvm-ar CC=clang LD=ld.lld HOSTAR=llvm-ar HOSTCC=clang \
         HOSTLD=ld.lld HOSTLDFLAGS=-fuse-ld=lld defconfig modules_prepare
  ...
    AR       /out/tools/objtool/libsubcmd.a
  /bin/sh: 1: ar: not found
  ...

Follow the logic of HOST{CC,LD} and allow the user to specify a
different ar tool via HOSTAR (which is used elsewhere in other
tools/ Makefiles).

Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>
Cc: <stable@vger.kernel.org>
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/80822a9353926c38fd7a152991c6292491a9d0e8.1558028966.git.jpoimboe@redhat.com
Link: https://github.com/ClangBuiltLinux/linux/issues/481
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Nathan Chancellor 2019-05-16 12:49:42 -05:00 committed by Ingo Molnar
parent 5a28fc94c9
commit 8ea58f1e8b
1 changed files with 2 additions and 1 deletions
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3
tools/objtool/Makefile
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@ -7,11 +7,12 @@ ARCH := x86
endif
# always use the host compiler
HOSTAR ?= ar
HOSTCC ?= gcc
HOSTLD ?= ld
AR = $(HOSTAR)
CC = $(HOSTCC)
LD = $(HOSTLD)
AR = ar
ifeq ($(srctree),)
srctree := $(patsubst %/,%,$(dir $(CURDIR)))