[PATCH] MIPS: try to select cross-compiler (if not set)

[Antony Pavlov]

Signed-off-by: Antony Pavlov <antonynpavlov at gmail.com>
---
 arch/mips/Makefile     |   15 +++++++++++++++
 scripts/Kbuild.include |   11 +++++++++++
 2 files changed, 26 insertions(+), 0 deletions(-)

diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index 1ec2107..4d635c6 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -17,6 +17,21 @@ else
 64bit-emul		= elf64btsmip
 endif
 
+ifdef CONFIG_32BIT
+tool-archpref		= $(32bit-tool-archpref)
+UTS_MACHINE		:= mips
+endif
+ifdef CONFIG_64BIT
+tool-archpref		= $(64bit-tool-archpref)
+UTS_MACHINE		:= mips64
+endif
+
+ifneq ($(SUBARCH),$(ARCH))
+  ifeq ($(CROSS_COMPILE),)
+    CROSS_COMPILE := $(call cc-cross-prefix, $(tool-archpref)-linux-  $(tool-archpref)-linux-gnu-  $(tool-archpref)-unknown-linux-gnu-)
+  endif
+endif
+
 CPPFLAGS += -D__MIPS__ -fno-strict-aliasing -fno-merge-constants
 
 cflags-y += -G 0 -mno-abicalls -fno-pic -pipe
diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index 95e7746..0e6e2c7 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -56,6 +56,17 @@ endef
 # gcc support functions
 # See documentation in Documentation/kbuild/makefiles.txt
 
+# cc-cross-prefix
+# Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-)
+# Return first prefix where a prefix$(CC) is found in PATH.
+# If no $(CC) found in PATH with listed prefixes return nothing
+cc-cross-prefix =  \
+	$(word 1, $(foreach c,$(1),                                   \
+		$(shell set -e;                                       \
+		if (which $(strip $(c))$(CC)) > /dev/null 2>&1 ; then \
+			echo $(c);                                    \
+		fi)))
+
 # output directory for tests below
 TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/)
 
-- 
1.7.5.4