linux-kernel - [PATCH v2 13/21] kconfig: add CC_IS_GCC and GCC

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Message-Id: <1522128575-5326-14-git-send-email-yamada.masahiro@socionext.com>
Date:   Tue, 27 Mar 2018 14:29:27 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     linux-kbuild@...r.kernel.org
Cc:     Sam Ravnborg <sam@...nborg.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Ulf Magnusson <ulfalizer@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        "Luis R . Rodriguez" <mcgrof@...nel.org>,
        Nicolas Pitre <nico@...aro.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 13/21] kconfig: add CC_IS_GCC and GCC_VERSION

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@...ionext.com>
---

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