linux-kernel - [tip:core/urgent] objtool: Allow AR to be overridden with HOSTAR

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Message-ID: <tip-8ea58f1e8b11cca3087b294779bf5959bf89cc10@git.kernel.org>
Date:   Fri, 17 May 2019 02:13:49 -0700
From:   tip-bot for Nathan Chancellor <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     tglx@...utronix.de, peterz@...radead.org, jpoimboe@...hat.com,
        ndesaulniers@...gle.com, mingo@...nel.org,
        linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
        hpa@...or.com, mojha@...eaurora.org, natechancellor@...il.com,
        stable@...r.kernel.org
Subject: [tip:core/urgent] objtool: Allow AR to be overridden with HOSTAR

Commit-ID:  8ea58f1e8b11cca3087b294779bf5959bf89cc10
Gitweb:     https://git.kernel.org/tip/8ea58f1e8b11cca3087b294779bf5959bf89cc10
Author:     Nathan Chancellor <natechancellor@...il.com>
AuthorDate: Thu, 16 May 2019 12:49:42 -0500
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 17 May 2019 11:10:42 +0200

objtool: Allow AR to be overridden with HOSTAR

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@...il.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
Reviewed-by: Mukesh Ojha <mojha@...eaurora.org>
Cc: <stable@...r.kernel.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.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@...nel.org>
---
 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)))