[Xen-devel] xen 4.1.0 rc1 build problem for local CONFIG_QEMU directory

[M A Young <m.a.young@xxxxxxxxxxxx>]

If you edit Config.mk by commenting CONFIG_QEMU ?= $(QEMU_REMOTE) and 
uncommenting CONFIG_QEMU ?= ../qemu-xen.git then the build fails with the 
error
+ test -d ../qemu-xen.git
+ mkdir -p ioemu-dir
...
        cd ioemu-dir; \
        ../qemu-xen.git/xen-setup
/bin/sh: line 4: ../qemu-xen.git/xen-setup: No such file or directory
make[1]: *** [ioemu-dir-find] Error 1

The problem is that (in tools/Makefile) if CONFIG_QEMU is a directory 
(when tested from tools) then QEMU_ROOT is set to this. Then the script 
goes into the ioemu-dir directory and runs $(QEMU_ROOT)/xen-setup . 
Unfortunately QEMU_ROOT is relative to tools not tools/ioemu-dir and 
things break. If you hack around this by adding and extra ../ to QEMU_ROOT 
it fails later because symbolic links created later on such as 
ioemu-dir/i386-dm/Makefile don't work.
So far the only way I have found to get it to work properly is to set 
CONFIG_QEMU to an absolute directory (because I know what it will be) 
which isn't portable.
        Michael Young

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