1 $NetBSD: README.mknative,v 1.6 2006/08/23 20:52:15 mrg Exp $
3 This file describes how to bootstrap the native toolchain on a new NetBSD
4 platform (and how to update the new toolchain files, if needed). These
5 files may be generated on a cross-compile host without problems.
7 NOTE: DO NOT RUN "mknative" BY HAND! It requires the Makefile in this
8 directory to set up certain environments first.
10 Since libc's features change over time, the config.h files can change as a
11 result; thus the instructions below are the same no matter whether
12 bootstrapping on a cross or native host. This is important: even on a
13 "native" host, you should bootstrap the toolchain by building from an
14 up-to-date source tree to a $DESTDIR using the exact same instructions.
16 In these notes, MACHINE is the $MACHINE of the target. These files can be
17 cross-generated. Though a $MACHINE_ARCH all uses the same config files, you
18 must pick a specific $MACHINE so that building the requisite bits below will
21 1. Set MKMAINTAINERTOOLS=yes in mk.conf. (Needed so that src/tools/gettext
22 gets built, eliciting proper HAVE_*GETTEXT* defns in config.h files.)
24 2. Build and install a cross toolchain (via "build.sh -m MACHINE tools").
26 3. In src/tools/gcc, do "nbmake-MACHINE bootstrap-libgcc".
28 This will create just enough glue in src/gnu/lib/libgcc4/arch to make it
29 possible to build, based on the toolchain built in ${.OBJDIR}/build.
30 Because the files generated in this step contain things like
31 -DCROSS_COMPILE, they are not suitable for committing. Step 8 below
32 will regenerate the "proper" libgcc config files.
35 "nbmake-MACHINE do-distrib-dirs obj includes MKGCC=no MKBINUTILS=no".
37 5. In src/gnu/lib/libgcc4, do "nbmake-MACHINE obj includes".
39 6. In src/gnu/lib/crtstuff4 do "nbmake-MACHINE depend all install"
41 7. In each of src/lib/csu, src/gnu/lib/libgcc4, src/lib/libdes, and src/lib,
42 do "nbmake-MACHINE all install".
44 Optionally, all of the following may be set in the environment to reduce
45 the amount of code needed to build at this step. Basically, it must be
46 possible for static binaries to build and base system libs to exist so
47 that "configure" can do its job for the target--these MK* options omit
48 the rest for this stage of the build.
55 8. In src/tools/gcc, do "nbmake-MACHINE native-gcc".
57 This will do a full configury in ${.OBJDIR}/.native that is a "Canadian"
58 cross toolchain (--build reflects the host platform, but --host and
59 --target are the target). The result is a tree that would build a
60 native-to-NetBSD compiler on a cross host, and mknative pulls glue data
63 9. Try out a full build using "nbmake-MACHINE"; the result should include
66 10. If all is well, commit the glue files added to src/gnu/{lib,usr.bin}/*.