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From:   Nathan Chancellor <natechancellor@gmail.com>
To:     Josh Poimboeuf <jpoimboe@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>
Cc:     Nick Desaulniers <ndesaulniers@google.com>,
        clang-built-linux@googlegroups.com, linux-kernel@vger.kernel.org,
        Nathan Chancellor <natechancellor@gmail.com>
Subject: [PATCH] objtool: Allow AR to be overridden with HOSTAR
Date:   Tue, 14 May 2019 15:40:47 -0700
Message-Id: <20190514224047.28505-1-natechancellor@gmail.com>
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Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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).

Link: https://github.com/ClangBuiltLinux/linux/issues/481
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
---
 tools/objtool/Makefile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/objtool/Makefile b/tools/objtool/Makefile
index 53f8be0f4a1f..88158239622b 100644
--- a/tools/objtool/Makefile
+++ b/tools/objtool/Makefile
@@ -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)))
-- 
2.22.0.rc0