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execution is usually unnecessary in BSD Makefiles because BSD make invokes shells with -e. Using it to give conditional execution is often wrong in BSD makefiles because BSD make joins shell commands when invoked in certain ways (in particular, as `make -jN'). Example makefile: --- clean: cd / false && true rm -rf * # a dangerous command --- This should terminate after the `false && true' command fails, but it doesn't when the commands are joined (`false && true' is a non- simple command, so -e doesn't cause termination). The b-maked version: --- clean: cd / false; true rm -rf * # a dangerous command --- terminates after the `false' command fails (`false' is a simple command, so -e causes termination). However, for versions of make like gnu make that don't invoke shells with -e, this change completely breaks the makefile. This is one of the fixes for the bug suite that caused `make world' to sometimes put raw cpp output in .depend files. Building of cc sometimes failed, but the failure did not terminate the build immediately, and various wrong versions of the cc components were used until one was wrong enough to cause a fatal error.
This is the top level of the FreeBSD source directory. This file was last revised on: $Id: README,v 1.10 1997/02/23 09:18:39 peter Exp $ 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, the most commonly used one being ``world'', which rebuilds and installs everything in the FreeBSD system from the source tree except the kernel and the contents of /etc. 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 with config(8) is a somewhat more involved process, documentation for which can be found at: http://www.freebsd.org/handbook/kernelconfig.html And in the config(8) man page. The sample kernel configuration files reside in the sys/i386/conf sub-directory (assuming that you've installed the kernel sources), the file named GENERIC being the one used to build your initial installation kernel. The file LINT contains entries for all possible devices, not just those commonly used, and is meant more as a general reference than an actual kernel configuration file (a kernel built from it wouldn't even run). Source Roadmap: --------------- bin System/User commands. contrib Packages contributed by 3rd parties. eBones Kerberos package - NOT FOR EXPORT! etc Template files for /etc games Amusements. gnu Various commands and libraries under the GNU Public License. Please see gnu/COPYING* for more information. include System include files. lib System libraries. libexec System daemons. lkm Loadable Kernel Modules. release Release building Makefile & associated tools. sbin System commands. secure DES and DES-related utilities - NOT FOR EXPORT! share Shared resources. sys Kernel sources. 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/handbook/synching.html