[PATCH v2 13/21] kconfig: add CC_IS_GCC and GCC_VERSION

[Masahiro Yamada]

This will be useful to specify the required compiler version,
like this:

config FOO
        bool "Use Foo"
        depends on GCC_VERSION >= 408000
        help
          This feature requires GCC 4.8 or newer.

Signed-off-by: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
---

Changes in v2: None

 init/Kconfig | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/init/Kconfig b/init/Kconfig
index c456030..923cab5 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -14,6 +14,14 @@ macro success $(shell ($(1) && echo y) || echo n)
 # expanded to y if the given compiler flag is supported, n otherwise
 macro cc-option $(success $CC -Werror $(1) -c -x c /dev/null -o /dev/null)
 
+config CC_IS_GCC
+	def_bool $(success $CC --version | grep -q gcc)
+
+config GCC_VERSION
+	int
+	default $(shell $srctree/scripts/gcc-version.sh -p $CC | sed 's/^0*//') if CC_IS_GCC
+	default 0
+
 config CONSTRUCTORS
 	bool
 	depends on !UML
-- 
2.7.4