linux-kernel - [PATCH 2/2] objtool: use host flags to detect if libelf is missing

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Date:   Fri, 23 Feb 2018 15:22:15 +0100
From:   Robin Jarry <robin.jarry@...nd.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Ingo Molnar <mingo@...nel.org>
Subject: [PATCH 2/2] objtool: use host flags to detect if libelf is missing

When libelf headers and libs are not found and CONFIG_UNWINDER_ORC is
selected, there is a make error introduced by
commit 3dd40cb320fe ("objtool: Upgrade libelf-devel warning to error for
CONFIG_ORC_UNWINDER").

Host headers and libs may be in a non-standard location and the check is
performed without host flags. Make sure to use host flags for the check
(they will be used later when building objtool anyway).

Fixes: 3b27a0c85d70 ("objtool: Detect and warn if libelf is missing and don't break the build")
Signed-off-by: Robin Jarry <robin.jarry@...nd.com>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Ingo Molnar <mingo@...nel.org>
---
 Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index e9609319d2b8..4e8c667b9f3f 100644
--- a/Makefile
+++ b/Makefile
@@ -955,7 +955,7 @@ export mod_sign_cmd
 
 ifdef CONFIG_STACK_VALIDATION
   has_libelf := $(call try-run,\
-		echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
+		echo "int main() {}" | $(HOSTCC) $(host_clfags) $(HOSTLDFLAGS) -xc -o /dev/null -lelf -,1,0)
   ifeq ($(has_libelf),1)
     objtool_target := tools/objtool FORCE
   else
-- 
2.11.0