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

From: Robin Jarry
Date: Fri Feb 23 2018 - 09:23:11 EST


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@xxxxxxxxx>
Cc: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
---
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