cc3abd3a65
we have both gcc's active in the tree. |
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gcc-version.mk | ||
Makefile | ||
mknative-gcc | ||
mknative-gcc.old | ||
mknative.common | ||
README.mknative |
$NetBSD: README.mknative,v 1.23 2019/09/30 08:40:20 mrg Exp $ This file describes how to bootstrap the native toolchain on a new NetBSD platform (and how to update the new toolchain files, if needed). These files may be generated on a cross-compile host without problems. NOTE: DO NOT RUN "mknative" BY HAND! It requires the Makefile in this directory to set up certain environments first. Since libc's features change over time, the config.h files can change as a result; thus the instructions below are the same no matter whether bootstrapping on a cross or native host. This is important: even on a "native" host, you should bootstrap the toolchain by building from an up-to-date source tree to a $DESTDIR using the exact same instructions. In these notes, MACHINE is the $MACHINE of the target. These files can be cross-generated. Though a $MACHINE_ARCH all uses the same config files, you must pick a specific $MACHINE so that building the requisite bits below will work. 0. Note that example paths like src/external/gpl3/gcc/lib/libgcc/arch will really be src/external/gpl3/gcc.old/lib/libgcc/arch for the previous GCC. 1. Set MKMAINTAINERTOOLS=yes in mk.conf. (Needed so that src/tools/gettext gets built, eliciting proper HAVE_*GETTEXT* defns in config.h files.) 2. Build and install a cross toolchain (via "build.sh -m MACHINE tools"). Note that while PR #47353 is not fixed, you can not use the -O option to build.sh. Use -M instead. (The differences are in layout and pathname prefixes in the object directory pointed to by each option.) 3. In src/tools/gcc, do "nbmake-MACHINE HAVE_GCC=8 bootstrap-libgcc". This will create just enough glue in src/external/gpl3/gcc/lib/libgcc/arch to make it possible to build, based on the toolchain built in ${.OBJDIR}/build. Because the files generated in this step contain things like -DCROSS_COMPILE, they are not suitable for committing. Step 8 below will regenerate the "proper" libgcc config files. 4. At top level, do "nbmake-MACHINE obj do-distrib-dirs MKGCC=no MKBINUTILS=no HAVE_GCC=8", and "nbmake-MACHINE includes HAVE_GCC= MKGCC=no MKBINUTILS=no HAVE_GCC=8". (Note: replace 8 [for GCC 8.x] with the appropriate version you are going to mknative-for, the MKGCC=no prevents the standard makefiles from picking up any gcc version info automatically) 5. In src/lib/csu, do "nbmake-MACHINE dependall". and "nbmake-MACHINE install". 6. In src/external/gpl3/gcc/lib/libgcc, do "nbmake-MACHINE obj includes dependall install". 7. In each of src/external/lgpl3/gmp/lib/libgmp, src/external/lgpl3/mpfr/lib/libmpfr, src/external/lgpl3/mpc/lib/libmpc do "nbmake-MACHINE obj dependall". 8. In src/lib, do "nbmake-MACHINE dependall install MKGCC=no HAVE_GCC=8". Optionally, all of the following may be set in the environment to reduce the amount of code needed to build at this step. Basically, it must be possible for static binaries to build and base system libs to exist so that "configure" can do its job for the target--these MK* options omit the rest for this stage of the build. MKLINT=no MKPROFILE=no MKSHARE=no MKRUMP=no 9. In src/tools/gcc, do "nbmake-MACHINE native-gcc". This will do a full configury in ${.OBJDIR}/.native that is a "Canadian" cross toolchain (--build reflects the host platform, but --host and --target are the target). The result is a tree that would build a native-to-NetBSD compiler on a cross host, and mknative pulls glue data from this. 10. Try out a full build using "nbmake-MACHINE"; the result should include a native compiler. 11. If all is well, commit the glue files added to src/gnu/{lib,usr.bin}/*.