[U-Boot] [PATCH 1/2] kbuild: Add clang detection

[Tom Rini]

Adapted from:

>From 5631d9c429857194bd55d7bcd8fa5bdd1a9899a3 Mon Sep 17 00:00:00 2001
From: Michal Marek <mmarek at suse.com>
Date: Wed, 19 Aug 2015 17:36:41 +0200
Subject: [PATCH 1/1] kbuild: Fix clang detection

We cannot detect clang before including the arch Makefile, because that
can set the default cross compiler. We also cannot detect clang after
including the arch Makefile, because powerpc wants to know about clang.
Solve this by using an deferred variable. This costs us a few shell
invocations, but this is only a constant number.

Reported-by: Behan Webster <behanw at converseincode.com>
Reported-by: Anton Blanchard <anton at samba.org>
Signed-off-by: Michal Marek <mmarek at suse.com>

in the Linux kernel.

This will allow us to make better decisions about when to run tests
later on for gcc features.

Signed-off-by: Tom Rini <trini at konsulko.com>
---
 scripts/Kbuild.include |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index 98e09ce..30e6e31 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -130,6 +130,10 @@ cc-option-align = $(subst -functions=0,,\
 cc-disable-warning = $(call try-run,\
 	$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
 
+# cc-name
+# Expands to either gcc or clang
+cc-name = $(shell $(CC) -v 2>&1 | grep -q "clang version" && echo clang || echo gcc)
+
 # cc-version
 cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
 
-- 
1.7.9.5