| Message ID | 20161109100305.6261-1-jezz@sysmic.org |
|---|---|
| State | Accepted |
| Headers | show |
Hello, On Wed, 9 Nov 2016 11:03:05 +0100, Jérôme Pouiller wrote: > Compiling Qemu statically allows to use it to chroot into target/. It is a > nice feature, so add an option for it. > > Signed-off-by: Jérôme Pouiller <jezz@sysmic.org> > --- > package/qemu/Config.in.host | 26 ++++++++++++++++++++++++++ > package/qemu/qemu.mk | 4 ++++ > 2 files changed, 30 insertions(+) Applied to master after tweaking a bit the Config.in help text. Thanks! Thomas
Hello, On Wed, 9 Nov 2016 11:03:05 +0100, Jérôme Pouiller wrote: > Compiling Qemu statically allows to use it to chroot into target/. It is a > nice feature, so add an option for it. > > Signed-off-by: Jérôme Pouiller <jezz@sysmic.org> > --- > package/qemu/Config.in.host | 26 ++++++++++++++++++++++++++ > package/qemu/qemu.mk | 4 ++++ > 2 files changed, 30 insertions(+) Now that this patch is committed, we are seeing some build failures on host-qemu when linked statically: http://autobuild.buildroot.net/results/6bc/6bcfabc020fede51adcfafc9a570df5884d95696/build-end.log http://autobuild.buildroot.net/results/4d0/4d0182da77cf386e57acf0565a18fc4628abbdc8/build-end.log Could you have a look? Thanks! Thomas
Jérôme, All, On 2017-04-02 14:37 +0200, Thomas Petazzoni spake thusly: > On Wed, 9 Nov 2016 11:03:05 +0100, Jérôme Pouiller wrote: > > Compiling Qemu statically allows to use it to chroot into target/. It is a > > nice feature, so add an option for it. > > > > Signed-off-by: Jérôme Pouiller <jezz@sysmic.org> > > --- > > package/qemu/Config.in.host | 26 ++++++++++++++++++++++++++ > > package/qemu/qemu.mk | 4 ++++ > > 2 files changed, 30 insertions(+) > > Now that this patch is committed, we are seeing some build failures on > host-qemu when linked statically: > > http://autobuild.buildroot.net/results/6bc/6bcfabc020fede51adcfafc9a570df5884d95696/build-end.log > http://autobuild.buildroot.net/results/4d0/4d0182da77cf386e57acf0565a18fc4628abbdc8/build-end.log > > Could you have a look? Feel free to grab patches from my okd series (which I lost intetrest in sometime ago): https://git.buildroot.org/~ymorin/git/buildroot/log/?h=yem/target-qemu At the time, I had full and complete static-link support with a lot of additional dependencies... Regards, Yann E. MORIN.
Hello, On Sun, 2 Apr 2017 23:14:29 +0200, Yann E. MORIN wrote: > Feel free to grab patches from my okd series (which I lost intetrest in > sometime ago): > > https://git.buildroot.org/~ymorin/git/buildroot/log/?h=yem/target-qemu > > At the time, I had full and complete static-link support with a lot of > additional dependencies... Thanks for pointing out those patches. However, to be honest, I myself have no interest in having host qemu built statically, so if Jérôme doesn't send patches to fix the breakage, I'll simply revert his patch. Best regards, Thomas
Thomas, All, On 2017-04-02 23:42 +0200, Thomas Petazzoni spake thusly: > Hello, > > On Sun, 2 Apr 2017 23:14:29 +0200, Yann E. MORIN wrote: > > > Feel free to grab patches from my okd series (which I lost intetrest in > > sometime ago): > > > > https://git.buildroot.org/~ymorin/git/buildroot/log/?h=yem/target-qemu > > > > At the time, I had full and complete static-link support with a lot of > > additional dependencies... > > Thanks for pointing out those patches. However, to be honest, I myself > have no interest in having host qemu built statically, so if Jérôme > doesn't send patches to fix the breakage, I'll simply revert his patch. Yes, my message was mostly aimed at Jérôme. ;-) Regards, Yann E. MORIN.
Hello, On Sun, 2 Apr 2017 14:37:17 +0200, Thomas Petazzoni wrote: > On Wed, 9 Nov 2016 11:03:05 +0100, Jérôme Pouiller wrote: > > Compiling Qemu statically allows to use it to chroot into target/. It is a > > nice feature, so add an option for it. > > > > Signed-off-by: Jérôme Pouiller <jezz@sysmic.org> > > --- > > package/qemu/Config.in.host | 26 ++++++++++++++++++++++++++ > > package/qemu/qemu.mk | 4 ++++ > > 2 files changed, 30 insertions(+) > > Now that this patch is committed, we are seeing some build failures on > host-qemu when linked statically: > > http://autobuild.buildroot.net/results/6bc/6bcfabc020fede51adcfafc9a570df5884d95696/build-end.log > http://autobuild.buildroot.net/results/4d0/4d0182da77cf386e57acf0565a18fc4628abbdc8/build-end.log > > Could you have a look? FWIW, I've reverted this patch. It's a feature that already wasn't seen as very essential, and it's causing some build failures. I don't think it's really easy to provide a functionality that allows to build a host executable as a static binary, because most host systems use glibc, and glibc doesn't officially support static linking. Feel free to investigate those build failures (see the commit log for the three different build failures) and send an updated version that makes sure those build failures are fixed. Thanks! Thomas
diff --git a/package/qemu/Config.in.host b/package/qemu/Config.in.host index b3eb590..c61b787 100644 --- a/package/qemu/Config.in.host +++ b/package/qemu/Config.in.host @@ -17,6 +17,32 @@ config BR2_PACKAGE_HOST_QEMU if BR2_PACKAGE_HOST_QEMU +config BR2_PACKAGE_HOST_QEMU_STATIC + bool "Build statically" + help + Build static qemu executable(s). Use this option if you want to + 'chroot' in your target directory. An example to do this for an ARM + target: + + 1. copy qemu binary on your target directory: + + cp host/usr/bin/qemu-arm target/usr/bin + + 2. Make sure binfmt_misc is mounted on /proc/sys/fs/binfmt_misc: + + mount -t binfmt_misc none /proc/sys/fs/binfmt_misc + + 3. Register /usr/bin/qemu-arm is interpreter for arm binaries. See + linux/Documentation/binfmt_misc.txt for more information: + + MAGIC='\x7f\x45\x4c\x46\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00' + MASK='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff' + echo ":qemu-arm:M:0:$MAGIC:$MASK:/usr/bin/qemu-arm:OC" > /proc/sys/fs/binfmt_misc/register + + 4. Chroot to your target: + + chroot target /bin/sh + comment "Emulators selection" config BR2_PACKAGE_HOST_QEMU_SYSTEM_MODE diff --git a/package/qemu/qemu.mk b/package/qemu/qemu.mk index cf23f16..d33106c 100644 --- a/package/qemu/qemu.mk +++ b/package/qemu/qemu.mk @@ -110,6 +110,10 @@ HOST_QEMU_OPTS += --enable-vde HOST_QEMU_DEPENDENCIES += host-vde2 endif +ifeq ($(BR2_PACKAGE_HOST_QEMU_STATIC),y) +HOST_QEMU_OPTS += --static +endif + # Override CPP, as it expects to be able to call it like it'd # call the compiler. define HOST_QEMU_CONFIGURE_CMDS
Compiling Qemu statically allows to use it to chroot into target/. It is a nice feature, so add an option for it. Signed-off-by: Jérôme Pouiller <jezz@sysmic.org> --- package/qemu/Config.in.host | 26 ++++++++++++++++++++++++++ package/qemu/qemu.mk | 4 ++++ 2 files changed, 30 insertions(+)