[PATCH 15/23] 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>
---

 init/Kconfig | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/init/Kconfig b/init/Kconfig
index 837a584..f2da5e9 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -12,6 +12,15 @@ config cc-option
 	string
 	macro $(shell $CC -Werror $(1) -c -x c /dev/null -o /dev/null)
 
+config CC_IS_GCC
+	bool
+	default $(shell $CC --version | grep -q gcc)
+
+config GCC_VERSION
+	int
+	default $(shell-stdout $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