linux-kernel - [PATCH v2 2/4] kbuild: Add hostcc-option macro

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Date:   Tue, 13 Jun 2017 16:08:52 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>,
        "H . J . Lu" <hjl.tools@...il.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <mmarek@...e.com>
Cc:     x86@...nel.org, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org, Michael Davidson <md@...gle.com>,
        Greg Hackmann <ghackmann@...gle.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Stephen Hines <srhines@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Arnd Bergmann <arnd@...db.de>,
        Bernhard.Rosenkranzer@...aro.org,
        Peter Foley <pefoley2@...oley.com>,
        Behan Webster <behanw@...verseincode.com>,
        Douglas Anderson <dianders@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>
Subject: [PATCH v2 2/4] kbuild: Add hostcc-option macro

hostcc-option is equivalent to cc-option, but uses the host compiler
and HOSTCFLAGS. Change HOSTCFLAGS to a simple expanded variable to
allow for HOSTCFLAGS += $(call hostcc-option, ...).

Suggested-by: Arnd Bergmann <arnd@...db.de>
Suggested-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
---
Changes in v2:
- Patch added in v2

 Makefile               | 2 +-
 scripts/Kbuild.include | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 83f6d9972cab..b234bba6d652 100644
--- a/Makefile
+++ b/Makefile
@@ -303,7 +303,7 @@ CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 
 HOSTCC       = gcc
 HOSTCXX      = g++
-HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
+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)
diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index 6dd0d1a921d6..4965ed92fc1e 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -123,6 +123,10 @@ CC_OPTION_CFLAGS = $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS))
 cc-option = $(call cc-option-raw, $(CC), $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS),\
 	$(1), $(2))
 
+# hostcc-option
+# Usage: HOSTCFLAGS += $(call hostcc-option, -fno-delete-null-pointer-checks,)
+hostcc-option = $(call cc-option-raw, $(HOSTCC), $(HOSTCFLAGS), $(1), $(2))
+
 # cc-option-yn
 # Usage: flag := $(call cc-option-yn,-march=winchip-c6)
 cc-option-yn = $(call try-run,\
-- 
2.13.1.518.g3df882009-goog