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Subject[PATCH] kbuild: llvmlinux: Fix -fno-delete-null-pointer-checks compiler-flag
Date
CLANG (here: v3.7) does not support '-fno-delete-null-pointer-checks'
as a compiler-flag.

Fix the HOSTCFLAGS and KBUILD_CFLAGS settings accordingly.
Furthermore, move and correct the $HOSTCC check.

Tested against Linux v4.3-rc1 and a refreshed llvmlinux patchset.
---
Makefile | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/Makefile b/Makefile
index aaf1d52bc646..4249441e535d 100644
--- a/Makefile
+++ b/Makefile
@@ -300,9 +300,9 @@ HOSTCXX = g++
HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
HOSTCXXFLAGS = -O2

-ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
-HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
- -Wno-missing-field-initializers -fno-delete-null-pointer-checks
+HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter -Wno-missing-field-initializers
+ifneq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
+HOSTCFLAGS += -fno-delete-null-pointer-checks
endif

# Decide whether to build built-in, modular, or both.
@@ -617,7 +617,9 @@ ARCH_AFLAGS :=
ARCH_CFLAGS :=
include arch/$(SRCARCH)/Makefile

+ifneq ($(cc-name),clang)
KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
+endif

ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
--
2.5.2


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