Subject: [PATCH 3/7] kbuild: clang: remove crufty HOSTCFLAGS

From: Nick Desaulniers <[email-masked]>
Date: Sat, 7 Oct 2017 13:23:23 -0700

commit df16aaac26e92e97ab7234d3f93c953466adc4b5 upstream.

When compiling with `make CC=clang HOSTCC=clang`, I was seeing warnings
that clang did not recognize -fno-delete-null-pointer-checks for HOSTCC
targets.  These were added in commit 61163efae020 ("kbuild: LLVMLinux:
Add Kbuild support for building kernel with Clang").

Clang does not support -fno-delete-null-pointer-checks, so adding it to
HOSTCFLAGS if HOSTCC is clang does not make sense.

It's not clear why the other warnings were disabled, and just for
HOSTCFLAGS, but I can remove them, add -Werror to HOSTCFLAGS and compile
with clang just fine.

Suggested-by: Masahiro Yamada <[email-masked]>
Signed-off-by: Nick Desaulniers <[email-masked]>
Signed-off-by: Masahiro Yamada <[email-masked]>
[nc: Backport to 4.9; adjust context]
Signed-off-by: Nathan Chancellor <[email-masked]>
---
 Makefile | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/Makefile b/Makefile
index 5f4557846b71..cf5f1a5cf42d 100644
--- a/Makefile
+++ b/Makefile
@@ -306,11 +306,6 @@ HOSTCXX      = g++
 HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
 HOSTCXXFLAGS = -O2
 
-ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
-HOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
-		-Wno-missing-field-initializers -fno-delete-null-pointer-checks
-endif
-
 # Decide whether to build built-in, modular, or both.
 # Normally, just do built-in.
 
-- 
2.21.0