Cross Compiling for Raspbian?

Hello all,

I am currently running the official Debian squeeze image on my RasPi. I am currently able to compile programs for it on a server setup to use Scratchbox (a cross-compiliation toolkit). I was wondering if there is a way i can compile programs using scratchbox that will work with Raspbian's armhf.

Thanks,
Shawn

[plugwash]

I haven't worked with scratchbox myself but AIUI you would have to build a cross toolchain for scratchbox with appropriate compiler options for raspbian. However I have no idea how to do this within the framework provided by scratchbox.

The key compiler options for raspbian are "-march=armv6 -mfpu=vfp -mfloat-abi=hard"

Thanks for the quick response,

I was afraid I would have to make a toolchain by hand. Thank you for telling me the compiler options, I will be sure to upload the toolchain when I am done with it.

--Shawn

Update: Using the default ARMv6 Toolkit, I tried compiling a simple hello world with gcc. When I executed "gcc -o armhfhellotest hello.c -march=armv6 -mfpu=vfp -mfloat-abi=hard" I got the following error message: "hello.c:1: sorry, unimplemented: -mfloat-abi=hard and VFP" Am I doing something wrong? I am fairly new to cross-compiling and not sure what to make of this error.

Thanks,
Shawn

I built a cross-compiler toolchain for raspbian using crosstool-NG (http://crosstool-ng.org/)
Here's the set of configuration options I used (taken from build.log): http://pastebin.com/w8gBXmPY
I'm not sure how this can be integrated into scratchbox though.

I succeeded sticking to this tutorial http://biffengineering.com/wiki/index.p ... nvironment

I am using Linux Mint Debian.

What needs to be done differently is:
Add all the arch options before building CT-NG

Change armel to armhf in the foldernames (not strictly necessary)

Use Raspbian as source for debootstrap! The command is:

Code: Select all

sudo debootstrap --verbose --keyring /etc/apt/trusted.gpg --arch armhf --foreign wheezy \
$HOME/sbox2/rootfs/armhf http://archive.raspbian.org/raspbian/

maybe you first have to add the key using

wget http://archive.raspbian.org/raspbian.public.key;apt-key add raspbian.public.key

I succeeded sticking to this tutorial http://biffengineering.com/wiki/index.p ... nvironment

I am using Linux Mint Debian.

What needs to be done differently is:
Add all the arch options before building CT-NG

Change armel to armhf in the foldernames (not strictly necessary)

Use Raspbian as source for debootstrap! The command is:

Code: Select all

sudo debootstrap --verbose --keyring /etc/apt/trusted.gpg --arch armhf --foreign wheezy \
$HOME/sbox2/rootfs/armhf http://archive.raspbian.org/raspbian/

maybe you first have to add the key using

wget http://archive.raspbian.org/raspbian.public.key;apt-key add raspbian.public.key

Hmmm I'm also sticking to the tutorial but I get stuck building scratchbox. Whiles compiling I get the error:

Code: Select all

mard0@mard0-Inspiron-1546:~/sbox2/src/scratchbox2$ make
make[1]: Entering directory `/home/mard0/sbox2/src/scratchbox2/obj-32'
make[2]: Entering directory `/home/mard0/sbox2/src/scratchbox2/obj-32'
echo "/* Automatically generated file. Do not edit. */" >include/scratchbox2_version.h
echo '#define SCRATCHBOX2_VERSION "'`cat .version`'"' >>include/scratchbox2_version.h
echo '#define LIBSB2_SONAME "'"libsb2.so.1"'"' >>include/scratchbox2_version.h
[CC] luaif/sb_log.o
../luaif/sb_log.c: In function ‘write_to_logfile’:
../luaif/sb_log.c:117:4: warning: ignoring return value of ‘write’, declared with attribute warn_unused_result [-Wunused-result]
../luaif/sb_log.c:122:4: warning: ignoring return value of ‘write’, declared with attribute warn_unused_result [-Wunused-result]
[ARCHIVE] luaif/libluaif.a
[SHLIB] preload/libsb2.so
[LD] utils/sb2-show
utils/sb2-show.o: In function `call_sb2__load_and_execute_lua_file__':
/home/mard0/sbox2/src/scratchbox2/obj-32/../utils/sb2-show.c:93: undefined reference to `dlsym'
utils/sb2-show.o: In function `call_sb2show__map_path2__':
/home/mard0/sbox2/src/scratchbox2/obj-32/../utils/sb2-show.c:75: undefined reference to `dlsym'
utils/sb2-show.o: In function `call_sb2show__execve_mods__':
/home/mard0/sbox2/src/scratchbox2/obj-32/../utils/sb2-show.c:82: undefined reference to `dlsym'
utils/sb2-show.o: In function `call_sblog_vprintf_line_to_logfile':
/home/mard0/sbox2/src/scratchbox2/obj-32/../utils/sb2-show.c:107: undefined reference to `dlsym'
utils/sb2-show.o: In function `main':
/home/mard0/sbox2/src/scratchbox2/obj-32/../utils/sb2-show.c:774: undefined reference to `dlopen'
/home/mard0/sbox2/src/scratchbox2/obj-32/../utils/sb2-show.c:781: undefined reference to `dlsym'
utils/sb2-show.o: In function `call_sb2__lua_c_interface_version__':
/home/mard0/sbox2/src/scratchbox2/obj-32/../utils/sb2-show.c:97: undefined reference to `dlsym'
utils/sb2-show.o: In function `call_sb2__set_active_exec_policy_name__':
/home/mard0/sbox2/src/scratchbox2/obj-32/../utils/sb2-show.c:89: undefined reference to `dlsym'
utils/sb2-show.o: In function `call_sb2show__get_real_cwd__':
/home/mard0/sbox2/src/scratchbox2/obj-32/../utils/sb2-show.c:101: undefined reference to `dlsym'
utils/sb2-show.o: In function `call_sb2show__binary_type__':
/home/mard0/sbox2/src/scratchbox2/obj-32/../utils/sb2-show.c:70: undefined reference to `dlsym'
utils/sb2-show.o:/home/mard0/sbox2/src/scratchbox2/obj-32/../utils/sb2-show.c:113: more undefined references to `dlsym' follow
collect2: ld returned 1 exit status
make[2]: *** [utils/sb2-show] Error 1
make[2]: Leaving directory `/home/mard0/sbox2/src/scratchbox2/obj-32'
make[1]: *** [regular] Error 2
make[1]: Leaving directory `/home/mard0/sbox2/src/scratchbox2/obj-32'
make: *** [multilib] Error 2


I noticed that the scratchbox git hasn't been updated for 15days, so I'm guessing that I'm missing something. I'm trying to build it on ubuntu 12.04. Where did you veer off from the tutorial and what did you change except using the raspbian repro?

Grtz

I changed --host=i386 to --host=AMD64, because I am using Linux Mint Debian 64bit.
Apart from that, I changed nothing!
It looks like it cannot find some lib it wants to link to. Maybe you are missing some package on Ubuntu?

when I compile a cross compiler (I do it from scratch, so using gcc, binutils, uClibc), I normally do:

Code: Select all

--target=armv7-hardfloat-linux-gnueabi --host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu

so give the full name, and for me specify host and build (as well as target) as I compile and run the compile on an x86_64, but producing code for an arm.

Stuff to make sure it goes in the right place, and independnet of whats already on the computer

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--prefix=/home/arm --with-sysroot=/home/arm --with-lib-path=/usr/lib:/lib --with-native-system-header-dir=/usr/include

And that its aimed at the right CPU:

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--enable-neon --with-arch=armv7-a --with-cpu=cortex-a9 --with-fpu=vfpv3 --with-float=hard --with-abi=aapcs-linux

Which you'll need to change for the Pi to v6, the right cpu, and probably the fpu.

Then whatever lanugages and other bits you want:

Code: Select all

--enable-languages=c --enable-threads --enable-tls --enable-shared --disable-libgomp --disable-nls --disable-multilib --disable-libmudflap --disable-libssp --disable-libgomp --disable-libquadmath --with-libliberty

Many of those will only compile when you've got the c library in place, so for example diable threads, shared, tls etc first time round ...

I found this tutorial to be particularly helpful:
http://www.bootc.net/archives/2012/05/26/how-to-build-a-cross-compiler-for-your-raspberry-pi/

I succeeded sticking to this tutorial http://biffengineering.com/wiki/index.p ... nvironment

I am using Linux Mint Debian.

What needs to be done differently is:
Add all the arch options before building CT-NG

Change armel to armhf in the foldernames (not strictly necessary)

Use Raspbian as source for debootstrap! The command is:

Code: Select all

sudo debootstrap --verbose --keyring /etc/apt/trusted.gpg --arch armhf --foreign wheezy \
$HOME/sbox2/rootfs/armhf http://archive.raspbian.org/raspbian/

maybe you first have to add the key using

wget http://archive.raspbian.org/raspbian.public.key;apt-key add raspbian.public.key

Just as an FYI, I've moved from my biffengineering site to a new domain. All the info was transfered but got rid of the wiki so once the redirect stops working go here http://jecxjo.motd.org/code/blosxom.cgi/devel/cross_compiler_environment

I succeeded sticking to this tutorial http://biffengineering.com/wiki/index.p ... nvironment

I am using Linux Mint Debian.

What needs to be done differently is:
Add all the arch options before building CT-NG

Change armel to armhf in the foldernames (not strictly necessary)

Use Raspbian as source for debootstrap! The command is:

Code: Select all

sudo debootstrap --verbose --keyring /etc/apt/trusted.gpg --arch armhf --foreign wheezy \
$HOME/sbox2/rootfs/armhf http://archive.raspbian.org/raspbian/

maybe you first have to add the key using

wget http://archive.raspbian.org/raspbian.public.key;apt-key add raspbian.public.key

Just as an FYI, I've moved from my biffengineering site to a new domain. All the info was transfered but got rid of the wiki so once the redirect stops working go here http://jecxjo.motd.org/code/blosxom.cgi/devel/cross_compiler_environment

Thanks for the tutorial. I got stuck at the "Cross Compiled Libraries" section though, as the 'apt-cross' tool seems to have been deprecated, and is not available for Ubuntu 12.10. Do you know of a replacement?