On Tue, Sep 06, 2005 at 10:13:52PM +0200, Andreas Gruenbacher wrote:
> When compiling a kernel with a separate output directory,
>
> /var/tmp/kernel-obj> cp $CONFIG_FILE .config
> /var/tmp/kernel-obj> make -C /usr/src/linux O=`pwd`
>
> the main kernel Makefile first tries to make sure that /usr/src/linux
> is a clean source tree by checking if /usr/src/linux contains .config
> or the include/asm symlink. This test is more restrictive than
> necessary, and can be relaxed with a few additional changes so that
> /usr/src/linux may contain a few additional critical files, and may
> still be used as the kernel compilation source.
>
> The additional files I have in mind are include/asm,
> include/linux/version.h, include/linux/autoconf.h, and perhaps also
> include/asm/offset.h. With these files present, it's possible to use
> kernel headers from user-space. I know that's evil and frowned upon,
> but it's still done once in a while, and sometimes it's the least
> painful path compared to the alternatives. The kbuild changes required
> to allow this IMHO are harmless; please consider for inclusion.
I've already included below patch from you.
It was included in -linus last night.
Do we really need more?
Sam
diff-tree d80e22460968ec7986c82fd7d207ebe3de59e03d (from c5f75eca120de6587e67a1951ce3e6912e2c6879)
Author: Sam Ravnborg <sam@mars.(none)>
Date: Thu Jul 14 20:22:39 2005 +0000
kbuild: Don't fail if include/asm symlink exists
From: Andreas Gruenbacher <[email protected]>
We're having the following situation: There are user-space applications
that include kernel headers directly. With a completely unconfigured
/usr/src/linux tree, including most headers fails because essential
files are not there:
include/asm
include/linux/autoconf.h
include/linux/version.h
So we create these files. On the other hand, we want to use
/usr/src/linux as read-only source for building kernels or additional
modules. Now when building a kernel with a separate output directory
(O=), there is a check in the main makefile for the include/asm symlink.
There is no real need for this check: if we ensure that
$(objdir)/include/asm is always created as the patch does,
$(srctree)/include/asm becomes irrelevant.
Signed-off-by: Sam Ravnborg <[email protected]>
diff --git a/Makefile b/Makefile
--- a/Makefile
+++ b/Makefile
@@ -765,11 +765,11 @@ $(vmlinux-dirs): prepare-all scripts
# 2) Create the include2 directory, used for the second asm symlink
prepare2:
ifneq ($(KBUILD_SRC),)
@echo ' Using $(srctree) as source for kernel'
- $(Q)if [ -h $(srctree)/include/asm -o -f $(srctree)/.config ]; then \
+ $(Q)if [ -f $(srctree)/.config ]; then \
echo " $(srctree) is not clean, please run 'make mrproper'";\
echo " in the '$(srctree)' directory.";\
/bin/false; \
fi;
$(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
@@ -777,11 +777,12 @@ ifneq ($(KBUILD_SRC),)
endif
# prepare1 creates a makefile if using a separate output directory
prepare1: prepare2 outputmakefile
-prepare0: prepare1 include/linux/version.h include/asm include/config/MARKER
+prepare0: prepare1 include/linux/version.h $(objtree)/include/asm \
+ include/config/MARKER
ifneq ($(KBUILD_MODULES),)
$(Q)rm -rf $(MODVERDIR)
$(Q)mkdir -p $(MODVERDIR)
endif
@@ -816,11 +817,11 @@ export CPPFLAGS_vmlinux.lds += -P -C -U$
# FIXME: The asm symlink changes when $(ARCH) changes. That's
# hard to detect, but I suppose "make mrproper" is a good idea
# before switching between archs anyway.
-include/asm:
+$(objtree)/include/asm:
@echo ' SYMLINK $@ -> include/asm-$(ARCH)'
$(Q)if [ ! -d include ]; then mkdir -p include; fi;
@ln -fsn asm-$(ARCH) $@
# Split autoconf.h into include/linux/config/*
-
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