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kumquat-buildroot/package/qemu/qemu.mk
Thomas Petazzoni f7add51c39 qemu: add host/target Linux version check 
Raise an error if the host is using an older kernel than the target.
Since qemu-user passes emulated system calls to the host kernel,
this prevents usage of qemu-user in situations where those system
calls will fail.

This is based on an original patch from Frank Hunleth
<fhunleth@troodon-software.com>, but completely rewritten in a
different way:

 * Instead of using shell based testing, we use pure make tests, which
   allows to detect the problem not when host-qemu starts to build,
   but at the very beginning of the entire Buildroot build.

 * Instead of looking at $(STAGING_DIR)/usr/include/linux/version.h
   (which requires having a dependency on the 'toolchain' package,
   which is a bit unusual for a host package), we use the
   BR2_TOOLCHAIN_HEADERS_AT_LEAST Config.in option which tells us the
   version of the kernel headers used in the toolchain.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Tested-by: Frank Hunleth <fhunleth@troodon-software.com>
2014-12-23 12:09:29 +01:00

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Makefile
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################################################################################
#
# qemu
#
################################################################################
QEMU_VERSION = 2.1.2
QEMU_SOURCE = qemu-$(QEMU_VERSION).tar.bz2
QEMU_SITE = http://wiki.qemu.org/download
QEMU_LICENSE = GPLv2 LGPLv2.1 MIT BSD-3c BSD-2c Others/BSD-1c
QEMU_LICENSE_FILES = COPYING COPYING.LIB
# NOTE: there is no top-level license file for non-(L)GPL licenses;
# the non-(L)GPL license texts are specified in the affected
# individual source files.
#-------------------------------------------------------------
# Host-qemu
HOST_QEMU_DEPENDENCIES = host-pkgconf host-zlib host-libglib2 host-pixman
# BR ARCH qemu
# ------- ----
# arm arm
# armeb armeb
# avr32 not supported
# bfin not supported
# i386 i386
# i486 i386
# i586 i386
# i686 i386
# x86_64 x86_64
# m68k m68k
# microblaze microblaze
# mips mips
# mipsel mipsel
# mips64 ?
# mips64el ?
# powerpc ppc
# sh2a not supported
# sh4 sh4
# sh4eb sh4eb
# sh4a ?
# sh4aeb ?
# sh64 not supported
# sparc sparc
HOST_QEMU_ARCH = $(ARCH)
ifeq ($(HOST_QEMU_ARCH),i486)
HOST_QEMU_ARCH = i386
endif
ifeq ($(HOST_QEMU_ARCH),i586)
HOST_QEMU_ARCH = i386
endif
ifeq ($(HOST_QEMU_ARCH),i686)
HOST_QEMU_ARCH = i386
endif
ifeq ($(HOST_QEMU_ARCH),powerpc)
HOST_QEMU_ARCH = ppc
endif
HOST_QEMU_TARGETS = $(HOST_QEMU_ARCH)-linux-user
ifeq ($(BR2_PACKAGE_HOST_QEMU),y)
HOST_QEMU_HOST_SYSTEM_TYPE = $(shell uname -s)
ifneq ($(HOST_QEMU_HOST_SYSTEM_TYPE),Linux)
$(error "qemu-user can only be used on Linux hosts")
endif
HOST_QEMU_HOST_SYSTEM_VERSION_MAJOR = $(shell uname -r | cut -f1 -d'.')
HOST_QEMU_HOST_SYSTEM_VERSION_MINOR = $(shell uname -r | cut -f2 -d'.')
HOST_QEMU_TARGET_SYSTEM_VERSION_MAJOR = $(shell echo $(BR2_TOOLCHAIN_HEADERS_AT_LEAST) | cut -f1 -d'.')
HOST_QEMU_TARGET_SYSTEM_VERSION_MINOR = $(shell echo $(BR2_TOOLCHAIN_HEADERS_AT_LEAST) | cut -f2 -d'.')
HOST_QEMU_COMPARE_VERSION_MAJOR = $(shell test $(HOST_QEMU_HOST_SYSTEM_VERSION_MAJOR) -ge $(HOST_QEMU_TARGET_SYSTEM_VERSION_MAJOR) && echo OK)
HOST_QEMU_COMPARE_VERSION_MINOR = $(shell test $(HOST_QEMU_HOST_SYSTEM_VERSION_MINOR) -ge $(HOST_QEMU_TARGET_SYSTEM_VERSION_MINOR) && echo OK)
#
# The principle of qemu-user is that it emulates the instructions of
# the target architecture when running the binary, and then when this
# binary does a system call, it converts this system call into a
# system call on the host machine. This mechanism makes an assumption:
# that the target binary will not do system calls that do not exist on
# the host. This basically requires that the target binary should be
# built with kernel headers that are older or the same as the kernel
# version running on the host machine.
#
ifneq ($(HOST_QEMU_COMPARE_VERSION_MAJOR)$(HOST_QEMU_COMPARE_VERSION_MINOR),OKOK)
$(error "Refusing to build qemu-user: target Linux version newer than host's.")
endif
endif
define HOST_QEMU_CONFIGURE_CMDS
cd $(@D); $(HOST_CONFIGURE_OPTS) ./configure \
--target-list="$(HOST_QEMU_TARGETS)" \
--prefix="$(HOST_DIR)/usr" \
--interp-prefix=$(STAGING_DIR) \
--cc="$(HOSTCC)" \
--host-cc="$(HOSTCC)" \
--extra-cflags="$(HOST_CFLAGS)" \
--extra-ldflags="$(HOST_LDFLAGS)"
endef
define HOST_QEMU_BUILD_CMDS
$(HOST_MAKE_ENV) $(MAKE) -C $(@D)
endef
define HOST_QEMU_INSTALL_CMDS
$(HOST_MAKE_ENV) $(MAKE) -C $(@D) install
endef
$(eval $(host-generic-package))
# variable used by other packages
QEMU_USER = $(HOST_DIR)/usr/bin/qemu-$(HOST_QEMU_ARCH)
#-------------------------------------------------------------
# Target-qemu
QEMU_DEPENDENCIES = host-pkgconf host-python libglib2 zlib pixman
# Need the LIBS variable because librt and libm are
# not automatically pulled. :-(
QEMU_LIBS = -lrt -lm
QEMU_OPTS =
QEMU_VARS = \
LIBTOOL=$(HOST_DIR)/usr/bin/libtool \
PYTHON=$(HOST_DIR)/usr/bin/python2 \
PYTHONPATH=$(TARGET_DIR)/usr/lib/python$(PYTHON_VERSION_MAJOR)/site-packages
# If we want to specify only a subset of targets, we must still enable all
# of them, so that QEMU properly builds its list of default targets, from
# which it then checks if the specified sub-set is valid. That's what we
# do in the first part of the if-clause.
# Otherwise, if we do not want to pass a sub-set of targets, we then need
# to either enable or disable -user and/or -system emulation appropriately.
# That's what we do in the else-clause.
ifneq ($(call qstrip,$(BR2_PACKAGE_QEMU_CUSTOM_TARGETS)),)
QEMU_OPTS += --enable-system --enable-linux-user
QEMU_OPTS += --target-list="$(call qstrip,$(BR2_PACKAGE_QEMU_CUSTOM_TARGETS))"
else
ifeq ($(BR2_PACKAGE_QEMU_SYSTEM),y)
QEMU_OPTS += --enable-system
else
QEMU_OPTS += --disable-system
endif
ifeq ($(BR2_PACKAGE_QEMU_LINUX_USER),y)
QEMU_OPTS += --enable-linux-user
else
QEMU_OPTS += --disable-linux-user
endif
endif
ifeq ($(BR2_PACKAGE_QEMU_SDL),y)
QEMU_OPTS += --enable-sdl
QEMU_DEPENDENCIES += sdl
QEMU_VARS += SDL_CONFIG=$(BR2_STAGING_DIR)/usr/bin/sdl-config
else
QEMU_OPTS += --disable-sdl
endif
ifeq ($(BR2_PACKAGE_QEMU_FDT),y)
QEMU_OPTS += --enable-fdt
QEMU_DEPENDENCIES += dtc
else
QEMU_OPTS += --disable-fdt
endif
define QEMU_CONFIGURE_CMDS
( cd $(@D); \
LIBS='$(QEMU_LIBS)' \
$(TARGET_CONFIGURE_OPTS) \
$(TARGET_CONFIGURE_ARGS) \
$(QEMU_VARS) \
./configure \
--prefix=/usr \
--cross-prefix=$(TARGET_CROSS) \
--with-system-pixman \
--audio-drv-list= \
--enable-kvm \
--enable-attr \
--enable-vhost-net \
--disable-bsd-user \
--disable-xen \
--disable-slirp \
--disable-vnc \
--disable-virtfs \
--disable-brlapi \
--disable-curses \
--disable-curl \
--disable-bluez \
--disable-guest-base \
--disable-uuid \
--disable-vde \
--disable-linux-aio \
--disable-cap-ng \
--disable-docs \
--disable-spice \
--disable-rbd \
--disable-libiscsi \
--disable-usb-redir \
--disable-smartcard-nss \
--disable-strip \
--disable-seccomp \
--disable-sparse \
--disable-tools \
$(QEMU_OPTS) \
)
endef
define QEMU_BUILD_CMDS
$(TARGET_MAKE_ENV) $(MAKE) -C $(@D)
endef
define QEMU_INSTALL_TARGET_CMDS
$(TARGET_MAKE_ENV) $(MAKE) -C $(@D) $(QEMU_MAKE_ENV) DESTDIR=$(TARGET_DIR) install
endef
$(eval $(generic-package))
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