Cross-compilation in pkgsrc (user's guide) -*- outline -*- Taylor R. Campbell $NetBSD: HOWTO-use-crosscompile,v 1.7 2019/07/09 15:45:35 riastradh Exp $ The following steps enable you to build binary packages for a machine architecture other than the one you are building on. For example, you might use them on your beefy umpteen-core amd64-based build machine (the `native' machine) to build packages for your feeble powerpc-based network appliance (the `target' machine). These instructions assume you use the conventional privileged paths: /usr/src for the NetBSD source tree, /usr/obj for the NetBSD object tree, and /usr/pkgsrc for the pkgsrc tree. If you want to do it unprivileged, see `* Unprivileged notes' below. XXX This currently works only for NetBSD. * Build NetBSD tools and distribution for the target system Use to build NetBSD tools and a distribution, and remember what the destdir and tooldir are -- you'll need them for pkgsrc's mk.conf. $ cd /usr/src $ ./ -m evbppc tools $ ./ -m evbppc distribution By default, the destdir will be /usr/obj/destdir.evbppc, and the tooldir will be (say) /usr/obj/tooldir.NetBSD-6.1-amd64 if you're running NetBSD 6.1 on amd64. * Set up mk.conf In addition to whatever else you want in your mk.conf for pkgsrc, add: # Cross-compile by default. # # XXX This currently can't be set to `yes' on the command line, # which is a bug. USE_CROSS_COMPILE?= yes .if !empty(USE_CROSS_COMPILE:M[yY][eE][sS]) # Specify the machine architecture of target packages. # # XXX This currently can't be set on the command line, which is a # bug. MACHINE_ARCH= powerpc # Point pkgsrc at the NetBSD tooldir and destdir. # # XXX There is no obvious variable that is set to amd64 so that we # could use # # TOOLDIR= /usr/obj/tooldir.${OPSYS}-${OS_VERSION}-${NATIVE_xyz} # # MACHINE is amd64 but, since it's not NATIVE_xyz, it's wrong. # NATIVE_MACHINE_ARCH is x86_64, not amd64. TOOLDIR= /usr/obj/tooldir.NetBSD-6.1-amd64 CROSS_DESTDIR= /usr/obj/destdir.evbppc # Put target work and packages in separate directories. (You might # use OBJMACHINE=yes or WRKOBJDIR=/tmp/work.${MACHINE_ARCH} instead # for the work directories.) # # XXX Should not need this. PACKAGES= ${PKGSRCDIR}/packages.${MACHINE_ARCH} WRKDIR_BASENAME= work.${MACHINE_ARCH} # XXX cwrappers needs to be taught to pass --sysroot. USE_CWRAPPERS= no .endif You can bootstrap pkgsrc or not; it shouldn't make a difference for cross-compilation. If you do, replace `make' by `bmake' below, of course. XXX Some variables, notably LOCALBASE and other paths that get baked into packages, cannot currently be set differently for native and target packages. * Work around libtool Libtool's build system is broken -- it misuses the GNU build system build/host/target settings. For now we need to kludge around it manually: $ cd /usr/pkgsrc/cross/cross-libtool-base $ make package $ pkg_add -m powerpc /usr/pkgsrc/packages.powerpc/All/cross-libtool-base-powerpc-2.4.2.tgz (This builds a libtool package for the target, and then installs the target package natively. This *shouldn't* work, and pkg_add normally refuses this, but it does work because libtool is a shell script, and `pkg_add -m powerpc' makes pkg_add pretend we are powerpc to suppress its refusal.) * Make some packages Now packages you build normally will be cross-compiled for the target: $ cd /usr/pkgsrc/net/isc-dhcpd4 && make package You can find the shiny new powerpc package at /usr/pkgsrc/packages.powerpc/ Any packages needed on natively to build the target packages will be built and installed automatically, but if for some reason you want to build a native package, you can run $ cd /usr/pkgsrc/net/isc-dhcpd4 && make package USE_CROSS_COMPILE=no XXX Note that currently you cannot omit USE_CROSS_COMPILE?=yes from your mk.conf and pass USE_CROSS_COMPILE=yes on the make command line. This is a bug. * Unprivileged notes I do all this stuff unprivileged in directories under my home directory so that it's easy for me to nuke build products without messing with the package installations I use for development. NetBSD srcdir: ~/netbsd/current/src NetBSD objdir: ~/netbsd/current/obj.evbppc NetBSD tooldir: ~/netbsd/current/obj.evbppc/tooldir.NetBSD-6.1-amd64 NetBSD destdir: ~/netbsd/current/obj.evbppc/destdir.evbppc pkgsrc: ~/pkgsrc/current/pkgsrc pkgsrc LOCALBASE: ~/pkgsrc/current/pkg (~/netbsd/current/src and ~/pkgsrc/current/pkgsrc are actually read-only null mounts of ~/netbsd/current/src-cvs and ~/pkgsrc/current/pkgsrc-cvs, respectively.) To build NetBSD, I run: $ cd ~/netbsd/current/src $ ./ -O ../obj.evbppc -U -u -m evbppc -j12 tools $ ./ -O ../obj.evbppc -U -u -m evbppc -j12 distribution My mk.conf additionally has UNPRIVILEGED=yes, and I bootstrap pkgsrc with $ cd ~/pkgsrc/current/pkgsrc/bootstrap $ ./bootstrap \ --gzip-binary-kit ~/pkgsrc/current/bootstrap/20130422.tgz \ --mk-fragment ~/pkgsrc/current/bootstrap/ \ --prefix ~/pkgsrc/current/pkg \ --unprivileged \ --workdir /tmp/bootwork and various other crud to customize the build and package options. This requires putting ~/pkgsrc/current/pkg/{bin,sbin} before /usr/{bin,sbin} in your PATH so that you see bmake and use the right pkg_* tools. Send me a note if you have questions about my setup. * Terminology This document and the relevant pkgsrc variables call the machine on which the packages are built the `native' machine, and the machine on which the packages are to be run the `target' machine. This is different from the GNU build system, which considers three different machines for so-called Canadian cross-builds, which pkgsrc does not support: The `build' machine is the machine on which the software is built. The `host' machine is the machine on which the software will run. The `target' machine is the machine that the software is being configured to operate on, such as a cross-compiler or cross-linker. These correspond to the pkgsrc nomenclature as follows: - Native packages configured for native compilation: GNU pkgsrc --- ------ build native host native target native - Native packages configured for cross-compilation: GNU pkgsrc --- ------ build native host native target target - Target packages: GNU pkgsrc --- ------ build native host target target target