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=head1 NAME
cross-gcc-gensource - generates sources to build a Debian cross toolchain
=head1 SYNOPSIS
[TARGET_LIST=<arches to target>] [HOST_LIST=<build arches>] [SUFFIX=.1] cross-gcc-gensource <gcc-version>
example:
/tmp$ TARGET_LIST="armel armhf" HOST_LIST="amd64" cross-gcc-gensource 5
.... lots of verbose output ....
/tmp$ cd cross-gcc-packages-amd64/cross-gcc-5-armel
/tmp/cross-gcc-packages-amd64/cross-gcc-5-armel$ ls
debian
/tmp/cross-gcc-packages-amd64/cross-gcc-5-armel$ dpkg-buildpackage
.... building cross-toolchain ....
=head1 DESCRIPTION
This is a utility that prepares a directory with debianized sources
which build cross toolchain packages. The sources produced by this
tool are very small; the code itself comes from the
C<gcc-version-source> package and the necessary patches and extra
build stuff comes from the C<cross-gcc-dev> package.
=head1 ARGUMENTS
Normal usage is
cross-gcc-gensource gcc_version
Where C<gcc_version> is the base version of the toolchain we're building. At the
time of this writing we know about versions C<4.9>, C<5>, C<6>, C<7>, C<8>. This
commandline argument is required.
=head2 Specifying the target architectures
This tool generates a separate source package for each target architecture (the
architecture targetted by the cross-compiler being built). By default these
architectures are targetted:
=over
=item arm64
=item armel
=item armhf
=item mips
=item mipsel
=item powerpc
=item ppc64el
=back
If a different set of target architectures is required, set the C<TARGET_LIST>
environment variable. For instance, to build for C<armel> and C<armhf>:
TARGET_LIST="armel armhf" cross-gcc-gensource 5
=head2 Specifying the host architectures
Similarly, this tool generates a separate source tree for each host architecture
(the architecture the cross-compiler being built runs on). By default these
architectures are targetted:
=over
=item amd64
=item i386
=back
If a different set of host architectures is required, set the C<HOST_LIST>
environment variable. For instance, to build just for C<amd64>:
HOST_LIST="amd64" cross-gcc-gensource 5
=head2 Specifying a verison suffix
If you need to upload a new source package when the version of
gcc-source built-against hasn't changed, then you need to add a
version suffix to avoid binary-version clashes. An optional SUFFIX
env var allows this.
TARGET_LIST="armel armhf" SUFFIX=.1 cross-gcc-gensource 5
=cut
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