linux-kernel - [RFC PATCH 2/2] kbuild: Cache a few more calls to the compiler

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Message-Id: <20170926175508.29950-3-dianders@chromium.org>
Date:   Tue, 26 Sep 2017 10:55:08 -0700
From:   Douglas Anderson <dianders@...omium.org>
To:     yamada.masahiro@...ionext.com, mmarek@...e.com
Cc:     groeck@...omium.org, briannorris@...omium.org,
        Douglas Anderson <dianders@...omium.org>,
        linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org
Subject: [RFC PATCH 2/2] kbuild: Cache a few more calls to the compiler

These are a few stragglers that I left out of the original patch to
cache calls to the C compiler ("kbuild: Add a cache for generated
variables") because they bleed out into the main Makefile and thus
uglify things a little bit.  The idea is the same here, though.

Signed-off-by: Douglas Anderson <dianders@...omium.org>
---

 Makefile | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index d1119941261c..7b7342d79771 100644
--- a/Makefile
+++ b/Makefile
@@ -652,7 +652,10 @@ KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)
 
 # check for 'asm goto'
-ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
+ASM_GOTO = $(call cached-val,$(call __sanitize-opt,asm_goto_$(CC)),\
+	   $$(shell $(CONFIG_SHELL) \
+	   $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)))
+ifeq ($(ASM_GOTO), y)
 	KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
 	KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
 endif
@@ -788,7 +791,9 @@ KBUILD_CFLAGS	+= $(call cc-option,-fdata-sections,)
 endif
 
 # arch Makefile may override CC so keep this after arch Makefile is included
-NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
+NOSTDINC_FLAGS += -nostdinc -isystem \
+		  $(call cached-val,$(call __sanitize-opt,cc_include_$(CC)),\
+		  $$(shell $(CC) -print-file-name=include))
 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 
 # warn about C99 declaration after statement
-- 
2.14.1.821.g8fa685d3b7-goog