[PATCH 7/7] kbuild: remove cc-option-yn, update Docs

[Nick Desaulniers <ndesaulniers@google.com>]

cc-option-yn can be replaced with cc-option. ie.
Checking for support:
ifeq ($(call cc-option-yn,$(FLAG)),y)
becomes:
ifneq ($(call cc-option,$(FLAG)),)

Checking for lack of support:
ifeq ($(call cc-option-yn,$(FLAG)),n)
becomes:
ifeq ($(call cc-option,$(FLAG)),)

This allows us to remove cc-option-yn. Do so and update the docs with
examples.

Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
---
 Documentation/kbuild/makefiles.rst | 22 +++++++++-------------
 scripts/Makefile.compiler          |  5 -----
 2 files changed, 9 insertions(+), 18 deletions(-)

diff --git a/Documentation/kbuild/makefiles.rst b/Documentation/kbuild/makefiles.rst
index db3af0b45baf..4538c36d8df0 100644
--- a/Documentation/kbuild/makefiles.rst
+++ b/Documentation/kbuild/makefiles.rst
@@ -650,24 +650,20 @@ more details, with real examples.
 	-march=pentium-mmx if supported by $(CC), otherwise -march=i586.
 	The second argument to cc-option is optional, and if omitted,
 	cflags-y will be assigned no value if first option is not supported.
-	Note: cc-option uses KBUILD_CFLAGS for $(CC) options
+	Note: cc-option uses KBUILD_CFLAGS for $(CC) options.
 
-   cc-option-yn
-	cc-option-yn is used to check if gcc supports a given option
-	and return 'y' if supported, otherwise 'n'.
+	cc-option can be combined with conditionals to perform actions based on tool
+	support.
 
 	Example::
 
-		#arch/ppc/Makefile
-		biarch := $(call cc-option-yn, -m32)
-		aflags-$(biarch) += -a32
-		cflags-$(biarch) += -m32
+		ifneq ($(call cc-option,$(FLAG)),)
+		# $(FLAG) is supported
 
-	In the above example, $(biarch) is set to y if $(CC) supports the -m32
-	option. When $(biarch) equals 'y', the expanded variables $(aflags-y)
-	and $(cflags-y) will be assigned the values -a32 and -m32,
-	respectively.
-	Note: cc-option-yn uses KBUILD_CFLAGS for $(CC) options
+	Or::
+
+		ifeq ($(call cc-option,$(FLAG)),)
+		# $(FLAG) is not supported
 
     cc-disable-warning
 	cc-disable-warning checks if gcc supports a given warning and returns
diff --git a/scripts/Makefile.compiler b/scripts/Makefile.compiler
index 86ecd2ac874c..c19c0b544c0f 100644
--- a/scripts/Makefile.compiler
+++ b/scripts/Makefile.compiler
@@ -51,11 +51,6 @@ __cc-option = $(call try-run,\
 cc-option = $(call __cc-option, $(CC),\
 	$(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS),$(1),$(2))
 
-# cc-option-yn
-# Usage: flag := $(call cc-option-yn,-march=winchip-c6)
-cc-option-yn = $(call try-run,\
-	$(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
-
 # cc-disable-warning
 # Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
 cc-disable-warning = $(call try-run,\
-- 
2.33.0.rc1.237.g0d66db33f3-goog