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From: Bastian Blank <waldi@debian.org>
Subject: kbuild: Make the toolchain variables easily overwritable
Date: Sun, 22 Feb 2009 15:39:35 +0100
Forwarded: not-needed
Allow make variables to be overridden for each flavour by a file in
the build tree, .kernelvariables.
We currently use this for ARCH, KERNELRELEASE, CC, and in some cases
also CROSS_COMPILE, CFLAGS_KERNEL and CFLAGS_MODULE.
This file can only be read after we establish the build tree, and all
use of $(ARCH) needs to be moved after this.
--- a/Makefile
+++ b/Makefile
@@ -255,42 +255,6 @@ SUBARCH := $(shell uname -m | sed -e s/i
ARCH ?= $(SUBARCH)
CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
-# Architecture as present in compile.h
-UTS_MACHINE := $(ARCH)
-SRCARCH := $(ARCH)
-
-# Additional ARCH settings for x86
-ifeq ($(ARCH),i386)
- SRCARCH := x86
-endif
-ifeq ($(ARCH),x86_64)
- SRCARCH := x86
-endif
-
-# Additional ARCH settings for sparc
-ifeq ($(ARCH),sparc32)
- SRCARCH := sparc
-endif
-ifeq ($(ARCH),sparc64)
- SRCARCH := sparc
-endif
-
-# Additional ARCH settings for sh
-ifeq ($(ARCH),sh64)
- SRCARCH := sh
-endif
-
-# Additional ARCH settings for tile
-ifeq ($(ARCH),tilepro)
- SRCARCH := tile
-endif
-ifeq ($(ARCH),tilegx)
- SRCARCH := tile
-endif
-
-# Where to locate arch specific headers
-hdr-arch := $(SRCARCH)
-
KCONFIG_CONFIG ?= .config
export KCONFIG_CONFIG
@@ -373,6 +337,44 @@ LDFLAGS_vmlinux =
CFLAGS_GCOV = -fprofile-arcs -ftest-coverage -fno-tree-loop-im
CFLAGS_KCOV := $(call cc-option,-fsanitize-coverage=trace-pc,)
+-include $(obj)/.kernelvariables
+
+# Architecture as present in compile.h
+UTS_MACHINE := $(ARCH)
+SRCARCH := $(ARCH)
+
+# Additional ARCH settings for x86
+ifeq ($(ARCH),i386)
+ SRCARCH := x86
+endif
+ifeq ($(ARCH),x86_64)
+ SRCARCH := x86
+endif
+
+# Additional ARCH settings for sparc
+ifeq ($(ARCH),sparc64)
+ SRCARCH := sparc
+endif
+
+# Additional ARCH settings for sh
+ifeq ($(ARCH),sh64)
+ SRCARCH := sh
+endif
+
+# Additional ARCH settings for tile
+ifeq ($(ARCH),tilepro)
+ SRCARCH := tile
+endif
+ifeq ($(ARCH),tilegx)
+ SRCARCH := tile
+endif
+
+# Where to locate arch specific headers
+hdr-arch := $(SRCARCH)
+
+ifeq ($(ARCH),m68knommu)
+ hdr-arch := m68k
+endif
# Use USERINCLUDE when you must reference the UAPI directories only.
USERINCLUDE := \
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