[PATCH 5.4 031/141] selftests: Set CC to clang in lib.mk if LLVM is set

From: Greg Kroah-Hartman
Date: Mon May 17 2021 - 11:02:45 EST

From: Yonghong Song <yhs@xxxxxx>

[ Upstream commit 26e6dd1072763cd5696b75994c03982dde952ad9 ]

selftests/bpf/Makefile includes lib.mk. With the following command
make -j60 LLVM=1 LLVM_IAS=1 <=== compile kernel
make -j60 -C tools/testing/selftests/bpf LLVM=1 LLVM_IAS=1 V=1
some files are still compiled with gcc. This patch
fixed lib.mk issue which sets CC to gcc in all cases.

Signed-off-by: Yonghong Song <yhs@xxxxxx>
Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx>
Acked-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
Link: https://lore.kernel.org/bpf/20210413153413.3027426-1-yhs@xxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
tools/testing/selftests/lib.mk | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/tools/testing/selftests/lib.mk b/tools/testing/selftests/lib.mk
index 3ed0134a764d..67386aa3f31d 100644
--- a/tools/testing/selftests/lib.mk
+++ b/tools/testing/selftests/lib.mk
@@ -1,6 +1,10 @@
# This mimics the top-level Makefile. We do it explicitly here so that this
# Makefile can operate with or without the kbuild infrastructure.
+ifneq ($(LLVM),)
+CC := clang

ifeq (0,$(MAKELEVEL))
ifeq ($(OUTPUT),)