On Fri, Jun 24, 2011 at 5:49 AM, Wookey <woo...@wookware.org> wrote: > +++ Marc-André Moreau [2011-06-23 17:40 -0400]: > > [I wrote a response to this for 4hrs last night then my mail server > crashed and lost it all - <mutter>. trying agin...] > > > Hi, > > > > I am Marc-Andre from the FreeRDP project, an open source RDP client. I > want to > > work on optimizing FreeRDP for ARM using the NEON processor extensions. > > Welome > > > It is my first time cross-compiling, so thank you for your understanding. > > Welcome to the joyful world of cross-building :-) >
Hehe, thank you for the long detailed answer, it is really appreciated :) > > > I have asked some questions on IRC, and read various pages from the wiki, > but I > > haven't managed to successfully cross-compile FreeRDP yet. Compiling > directly > > on the pandaboard works, but it is atrociously slow. I have made a chroot > > environment following and adapting the instructions from the following > wiki > > page: > https://wiki.linaro.org/Platform/DevPlatform/CrossCompile/UsingXdeb > > Nothing wrong with this method, and it is reliable, but I find it > quicker and easier to use multistrap and do: > multistrap -f > Will look into that, it could save me time > > > I have tried both xdeb and xapt, both causing problems. > > > xapt: > > > > I managed to fetch and convert packages with xapt, using the following > command: > > sudo xapt -a armel -k -b --suite natty --mirror http://ports.ubuntu.com/ > > libssl-dev libx11-dev libxv-dev libxkbfile-dev libxcursor-dev > libasound2-dev > > libxcb1 libxcb1-dev libdirectfb-dev libc6 libc6-dev zlib1g zlib1g-dev > > > > The problem is then that xapt will fail to install the converted > packages, > > saying the package architecture is different from the current > architecture, as > > well as missing dependencies. I worked around the problem with this ugly > hack: > > > > cd /var/lib/xapt/output/ > > sudo dpkg -i --force-all *.deb > > You are suffering from this problem: > http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=629595 which is > because we are in the middle of a transition to multiarch packages. > When xapt/dpkg-cross were written it was assumed that thay would > simply ignore multiarched packages. However in practice it turns out > that that's not the case and currently they need to be converted back > to old-style locations. that needs the -m option supplying to xapt. > The version in natty is too old to have option. > > So if you do sudo xapt -a armel -b libssl-dev libx11-dev libxv-dev \ > libxkbfile-dev libxcursor-dev libasound2-dev libxcb1 libxcb1-dev \ > libdirectfb-dev libc6 libc6-dev zlib1g zlib1g-dev libcups2-dev > > on a wheezy box/chroot then all that stuff get downloaded, converted > and installed correctly. > Ok, so I should assume that this stuff is broken for pretty much anyone using natty? > > > Following this, I could get the FreeRDP configure script to work, even > though > > it would fail to detect X11 properly: > > > > PKG_CONFIG_PATH=/usr/arm-linux-gnueabi/lib/pkgconfig ./configure --host= > > arm-linux-gnueabi --with-neon > > X11 is detected OK for me: > FreeRDP configure result: > > Cryptography : openssl > TLS : enabled > Sound : yes > Printer : no > CUnit : no > X11 : yes > DirectFB : no > > > > When trying to build after that, it will still fail to link in the end, > > complaining about missing libraries such as zlib, X11, crypto, etc. I > tried > > installing various packages more with xapt, but I couldn't get it to > work. > > If I do PKG_CONFIG_LIBDIR=/usr/arm-linux-gnueabi/lib/pkgconfig > dpkg-buildpackage -aarmel > > then it all builds OK (on wheezy), except that the printer support is > not found. The confiure script needs checking to find out why that's > failing. That path-setting shouldn't be neeed either but it's not > working without it, even with the cross-version of pkg-config > installed. Again, needs further investigation. > > You can work round the cups non-identificatin with > HAVE_CUPS=1 PKG_CONFIG_LIBDIR=/usr/arm-linux-gnueabi/lib/pkgconfig > dpkg-buildpackage -aarmel > I can deal with the fact that CUPS support is broken, I mainly need to get the basic stuff working so that I can optimize graphical rendering, but that's good to know :P > > To get this working on natty you would need to get the current xapt, an > ubuntu port of which is available here: > > http://wookware.org/software/repo/ natty main > or just here: > > http://wookware.org/software/repo/pool/main/e/emdebian-crush/xapt_2.2.16ubuntu1_all.deb > > however there is then a link failure, when it tries to link the wrong > arch of libpthread.so: > /usr/lib/gcc/arm-linux-gnueabi/4.5.2/../../../../arm-linux-gnueabi/bin/ld: > skipping incompatible /usr/lib/x86_64-linux-gnu/libpthread.so when > searching for -lpthread > /usr/lib/x86_64-linux-gnu/libpthread.a: could not read symbols: File format > not recognized > collect2: ld returned 1 exit status > If I understand correctly, xapt is broken on natty, so I could give this build of xapt a try, but then when trying to build FreeRDP I'll still have the problem described above? > > Again - needs looking into. > > > xdeb: > > > > I tried the following: > > root@workstation:/# xdeb -a armel --prefer-apt libssl-dev libx11-dev > libxv-dev > > libxkbfile-dev libxcursor-dev libasound2-dev > >... > > No source package found: libssl-dev > > > > Or, alternatively, the following: > > root@workstation:/# xdeb -a armel --convert libssl-dev libx11-dev > libxv-dev > > libxkbfile-dev libxcursor-dev libasound2-dev > >.. > > IOError: [Errno 2] No such file or directory: './libssl-dev' > > > > Here is my sources.list file: > > root@workstation:/# cat /etc/apt/sources.list > > deb http://archive.ubuntu.com/ubuntu natty main universe > > deb-src http://archive.ubuntu.com/ubuntu natty main universe > > deb [arch=armel] http://ports.ubuntu.com/ natty main universe > > deb-src [arch=armel] http://ports.ubuntu.com/ natty main universe > > That looks OK (except the last line should be: > deb-src http://ports.ubuntu.com/ natty main universe > (It doesn't actually break anything - just makes no sense - Have I > left that in a doc somewhere?) > Hum... not sure where I read that, are you referring to the [arch=armel] part? I read in certain places that it was something new that should be there, but it didn't change anything. > > So for xdeb you want this command: > > xdeb -a armel --prefer-apt --only-explicit freerdp > > On wheezy that dies quickly with a package conflict: > he following packages have unmet dependencies: > heimdal-dev : Conflicts: libkrb5-dev but 1.9.1+dfsg-1+b1 is to be > installed > libdb-dev : Depends: libdb5.1-dev but it is not going to be installed > Conflicts: libdb4.8-dev but 4.8.30-8 is to be installed > libdb4.8-dev : Conflicts: libdb-dev but 5.1.4 is to be installed > libkrb5-dev : Conflicts: heimdal-dev but 1.4.0-6 is to be installed > unixodbc-dev : Conflicts: libiodbc2-dev but 3.52.7-2 is to be installed > E: Broken packages > > Not sure what's going on there, but it's not much use. > > On natty things go much better and it downloads, crosses and builds a > load of stuff until falling over with : > > pkg-deb: building package libosmesa6-armel-cross' in > ./libosmesa6-armel-cross_7.10.2-0ubuntu2_all.deb'. > dpkg-cross: package libegl1-mesa-drivers doesn't provide any useful files. > Skipping. > > Which is due to this bug: > https://bugs.launchpad.net/ubuntu/+source/xdeb/+bug/731079 > (xdeb stops if it comes across a package it thought it should cross > which is in fact dpkg-cross 'NULL'). This is rather annoying and I > think I have a fix mostly-done but it's not merged yet - need to check > where that got to. You can fix it by adding the offending package to > the xdeb blacklist )that's how it currently expects to work): > so add libosmesa6 to /etc/xdeb/xdeb.conf in the 'blacklist' section. > > However after doing that it doesn't get much further before: > .:terminate called after throwing an instance of 'std::out_of_range' > > > I'm stuck at this point. Can anybody point me towards possible solution > paths > > on how to cross-compile FreeRDP for ARM, given the above information? > > So, the easiest way to get cross-building is to do it on a debian > wheezy machine/chroot where the tools and build work OK. As you want > to do neon dev then you may need to install a new-enough > cross-toolchain, which probably means a linaro one. > I see the linaro wiki and website refer to ubuntu a lot, and not necessarily debian. There is also much more support and documentation for ubuntu rather than debian for the pandaboard. I understand it would be much easier to get it to compile in the first place with debian wheezy, but I would prefer staying with ubuntu, if it is possible. I tried just tried xapt in oneiric, it doesn't seem to be fixed :( Besides xapt, what would be seriously broken in ubuntu natty? Maybe I could just compile the latest version of xapt myself on natty? > > I'll look into the natty build failures and see if we can get that > going for you. This is clearly a package that ought to cross OK. > > So, now you know why people native-build :-) there are an awful lot > fewer things to go wrong and the tools are much more mature. There is > plenty of work going on at the moment to improve the situation, and at > least your source package is farily well-behaved (many aren't). It > does look like it needs a couple of fixes though so a plain > dpkg-buildpackage -aarmel would work as expected. > > So, is a wheezy-based build sufficient for you for the time being? Or > do you have to have it building on natty to do useful dev? > My main problem would be debian support on the pandaboard which is much less documented than ubuntu. I'd prefer working around the various issues found in natty and work with natty instead, if we can work around all the current problems. If it's just too much of a pain, I'll have to give wheezy a try, but I don't think it'll be as easy to get wheezy up and running on the pandaboard. > > Wookey > -- > Principal hats: Linaro, Emdebian, Wookware, Balloonboard, ARM > http://wookware.org/ >
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