From 908f78eb59699ce1533b23adede0c89adae45554 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pehjota>
Date: Thu, 11 Sep 2014 15:48:38 -0400
Subject: dev/mentoring/vals-soc/ma-and-cross-toolchains: New page

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+[[!meta title="Multiarch and cross toolchains"]]
+
+ProteanOS intends to cross build its packages for ARM and MIPS architectures,
+since such systems often lack the RAM and CPU cycles to easily run native builds
+of larger packages.  Obviously cross toolchains are needed for this.  Less
+obviously, libraries of foreign architectures need to be installed to satisfy
+package build dependencies, often coinstalled alongside their native
+architecture versions.  To support this, ProteanOS is implementing a "multiarch"
+system similar to that of Debian and Ubuntu.  Libraries are installed into
+architecture-specific locations so that libraries of the same name and different
+architectures can be coinstalled without conflicts.  Also, the package manager
+(opkg) needs to support the (co)installation of foreign-architecture packages
+and resolve dependencies across architectures.
+
+The first part of this project is to make ProteanOS support the installation of
+packages of foreign architectures and the multiarch coinstallation of library
+and development packages; this work is already in progress.  The second part is
+to build and test cross GCC binary packages; packaging code to build cross GCC
+packages exists but hasn't been enabled and tested.  The third part is to design
+and implement cross-architecture dependency resolution in opkg.  Depending on
+the student's time and interest, the project may be extended to include a Perl
+package with patches and configurations to support cross building or the
+bootstrapping of a ProteanOS cross toolchain (including the C library) for a new
+architecture.
+
+  * Mentor: Patrick "P. J." McDermott (pehjota in #proteanos-dev on freenode
+    IRC,
+    [mailto:pj+vals-soc-vps@pehjota.net](mailto:pj+vals-soc-vps@pehjota.net))
+  * Desirable skills: C, Python, shell command language, makefile syntax,
+    familiarity with building GCC, Git, the specification and implementation of
+    multiarch in Debian and Ubuntu
+  * Project deliverables: Patches to opkg 0.2.x and upstream master branch to
+    support multiarch coinstallation, foreign architecture selection, and
+    cross-architecture dependency resolution; tested patches to ProteanOS's
+    gcc-4.7 package to enable cross compiler binary packages
+  * Difficulty: High
+
+Tags: GCC, compilers, toolchains, multiarch, package management, C, packaging
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