Development/Howto/CrossCompilation
From Mandriva
This page quickly describes the steps used to create a cross compilation package using the gcc srpm
Contents |
Compiling binutils
First, you need to get the srpm of binutils, found on any good mirror. I will use a local mirror for the next example.
Then, you need to setup an rpm building environment, as explained in the RpmHowTo. And then, you need to recompile binutils with a flag :
[misc@n1 ~] $ rpm --define "cross ppc" --rebuild /SRPMS/main/binutils-2.15.92.0.2-4mdk.src.rpm Installing /SRPMS/main/binutils-2.15.92.0.2-4mdk.src.rpm Executing(%prep): /bin/sh -e /home/misc/tmp/rpm-tmp.88205 + umask 022 + cd /home/misc/rpm/BUILD + cd /home/misc/rpm/BUILD + rm -rf binutils-2.15.92.0.2 ... Checking for multiarch file(s): /usr/lib/rpm/check-multiarch-files Wrote: /home/misc/rpm/RPMS/i586/cross-ppc-binutils-2.15.92.0.2-4mdk.i586.rpm Wrote: /home/misc/rpm/RPMS/i586/cross-ppc-libbinutils2-2.15.92.0.2-4mdk.i586.rpm Wrote: /home/misc/rpm/RPMS/i586/cross-ppc-libbinutils2-devel-2.15.92.0.2-4mdk.i586.rpm Executing(%clean): /bin/sh -e /home/misc/tmp/rpm-tmp.27022 + umask 022 + cd /home/misc/rpm/BUILD + cd binutils-2.15.92.0.2 + rm -rf /home/misc/tmp/cross-ppc-binutils-2.15.92.0.2-root + exit 0
You need to install those rpm's on your system in order to build a gcc cross compiler.
Compiling gcc
Since gcc requires gcc to be compiled, you need to bootstrap it. This is simply done by adding a define :
[misc@n1 ~] $ rpm --define "cross_bootstrap ppc" --rebuild /SRPMS/main/gcc-3.4.3-3mdk.src.rpm Installing /SRPMS/main/gcc-3.4.3-3mdk.src.rpm Executing(%prep): /bin/sh -e /home/misc/tmp/rpm-tmp.64546 + umask 022 + cd /home/misc/rpm/BUILD ....
You can now install the produced rpm, to start the cross compilation.
Utilisation of the cross compiler
In order to use the cross compiler, you simply replace cc with this compiler, either with the update-alternatives command, or by changing the CC environment variables.
Various cross compilation targets
You can either specify an architecture (such as ppc, sparc64, etc) or also give some interesting target such as "i586-mingw32msvc" (use cross mingw32 to compile) to create a win32 cross compiler, that can create a microsoft windows® executable with a simple C source code.
