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Using buildworld, installworld, buildworld. It is expected that nothing should rebuild. However any host tool used could have its timestamp updated. Any library used by dynamic tools could have its timestamp updated. The filemon(4) data in the .meta files captures all reads to these files. This causes the 2nd buildworld to rebuild everything since host tools and files have been updated. Because the build is self-reliant and bootstraps itself, it should be safe to ignore mtime changes on host files used during the build. Host files should only impact the build of legacy, build-tools, bootstrap-tools, cross-tools, but those are already intended to be reproducible from its own bootstrapping. It is possible in a rare case that a bug in a host file does produce a broken build tool. If that happens it will just have to be communicated properly. An alternative solution would be to update the mtime of all files in the object directory after installworld so that the host files are not newer than the object files. That also requires special care for read-only obj directories and special care to not mess with any intended timestamps in the build, such as done for reproducibility. Reported by: many Sponsored by: EMC / Isilon Storage Division
This is the top level of the FreeBSD source directory. This file was last revised on: $FreeBSD$ For copyright information, please see the file COPYRIGHT in this directory (additional copyright information also exists for some sources in this tree - please see the specific source directories for more information). The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree. See build(7) and http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html for more information, including setting make(1) variables. The `buildkernel` and `installkernel` targets build and install the kernel and the modules (see below). Please see the top of the Makefile in this directory for more information on the standard build targets and compile-time flags. Building a kernel is a somewhat more involved process. See build(7), config(8), and http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html for more information. Note: If you want to build and install the kernel with the `buildkernel` and `installkernel` targets, you might need to build world before. More information is available in the handbook. The kernel configuration files reside in the sys/<arch>/conf sub-directory. GENERIC is the default configuration used in release builds. NOTES contains entries and documentation for all possible devices, not just those commonly used. Source Roadmap: --------------- bin System/user commands. cddl Various commands and libraries under the Common Development and Distribution License. contrib Packages contributed by 3rd parties. crypto Cryptography stuff (see crypto/README). etc Template files for /etc. gnu Various commands and libraries under the GNU Public License. Please see gnu/COPYING* for more information. include System include files. kerberos5 Kerberos5 (Heimdal) package. lib System libraries. libexec System daemons. release Release building Makefile & associated tools. rescue Build system for statically linked /rescue utilities. sbin System commands. secure Cryptographic libraries and commands. share Shared resources. sys Kernel sources. tests Regression tests which can be run by Kyua. See tests/README for additional information. tools Utilities for regression testing and miscellaneous tasks. usr.bin User commands. usr.sbin System administration commands. For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/synching.html