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INSTALL    150 lines (138 with data), 7.5 kB


The two files that SBCL needs to run are sbcl and sbcl.core.
They are in 

sbcl is a standard executable, built by compiling and linking an
ordinary C program. It provides the runtime environment for the
running Lisp image, but it doesn't know much about high-level Lisp
stuff (like symbols and printing and objects) so it's pretty useless
by itself. sbcl.core is a dump file written in a special SBCL format
which only sbcl understands, and it contains all the high-level Lisp

In order to get a usable system, you need to run sbcl in a way that
it can find sbcl.core. There are three ways for it to find
  1. by default, in /usr/lib/sbcl.core or /usr/local/lib/sbcl.core
  2. by environment variable: 
     $ export SBCL_HOME=/foo/bar/
     $ sbcl
  3. by command line option:
     $ sbcl --core /foo/bar/sbcl.core"
The usual, recommended approach is method #1. Method #2 is useful if
you're installing SBCL on a system in your user account, instead of
installing SBCL on an entire system. Method #3 is mostly useful for
testing or other special cases.

So: the standard installation procedure is
  1. Copy sbcl.core to /usr/lib or /usr/local/lib.
  2. Copy sbcl to /usr/bin or /usr/local/bin.
  3. Optionally copy sbcl.1 to /usr/man/man1 or /usr/local/man/man1.
The script install.sh does these for you (choosing the /usr/local
subdirectory) in each case.


This software has been built successfully on these systems:
	cpu = x86 (Intel 386 or higher, or compatibles like the AMD K6)
		os = Debian GNU/Linux 2.1 with libc >= 2.1
			host lisp = CMU CL 2.4.17
			host lisp = SBCL itself
		os = RedHat Linux 6.2
			host lisp = SBCL itself
		os = FreeBSD 3.4 or 4.0
			host lisp = CMU CL
			host lisp = SBCL itself
		os = OpenBSD 2.6
			host lisp = SBCL itself
It is known not to build under CLISP, because CLISP doesn't support
MAKE-LOAD-FORM. Reports of other systems that it works on, or help in
making it run on more systems, would be appreciated.

	    SBCL, like CMU CL, overcommits memory. That is, it
	asks the OS for more virtual memory address space than
	it actually intends to use, and the OS is expected to
	optimistically give it this address space even if the OS
	doesn't have enough RAM+swap to back it up. This works
	fine as long as SBCL's memory usage pattern is sparse
	enough that the OS can actually implement the requested
	VM usage. Unfortunately, if the OS runs out of RAM+swap to
	implement the requested VM usage, things get bad. On many
	systems, including the Linux 2.2.13 kernel that I used for
	development of SBCL up to version 0.6.0, the kernel kills
	processes more-or-less randomly when it runs out of
	resources. You may think your Linux box is very stable, but
	it is unlikely to be stable if this happens.:-| So be sure
	to have enough memory available when you build the system.
	    (This can be considered a bug in SBCL, or a bug in the
	Unix overcommitment-of-memory architecture, or both. It's
	not clear what the best fix is. On the SBCL side, Peter Van
	Eynde has a lazy-allocation patch for CMU CL that lets
	it run without overcommitting memory, and that could be
	ported to SBCL, but unfortunately that might introduce
	new issues, e.g. alien programs allocating memory in the 
	address space that SBCL thinks of as its own, and later
	getting trashed when SBCL lazily allocates the memory.
	On the OS side, there might be some way to address the
	problem with quotas, I don't know.)

To build the system binaries:
  0. If you want to be on the bleeding edge, you can update your
     sources to the latest development snapshot (or any previous
     development snapshot, for that matter) by using anonymous CVS
     to SourceForge. (This is not recommended if you're just using SBCL
     as a tool for other work, but if you're interested in working on 
     SBCL itself, it's a good idea.) Follow the "CVS Repository" link on
     <http://sourceforge.net/projects/sbcl> for instructions.
  1. Make sure that you have enough RAM+swap to build SBCL, as
     per the CAUTION note above. (As of version 0.6.0, the most
     memory-intensive operation in make.sh is the second call to
     GENESIS, which makes the Lisp image grow to nearly 128 Mb RAM+swap.
     This will probably be reduced somewhat in some later version
     by allowing cold load of byte-compiled files, so that the cold
     image can be smaller.)
  2. If the GNU make command is not available under the name "gmake",
     then define the environment variable GNUMAKE to a name where it can
     be found.
  3. If you like, you can tweak the *FEATURES* set for the resulting
     Lisp system, enabling or disabling features like documentation
     strings or extra debugging code. The preferred way to do this is
     by creating a file "customize-target-features.lisp", containing
     a lambda expression which is applied to the default *FEATURES*
     set and which returns the new *FEATURES* set, e.g.
     (This is the preferred way because it lets local changes interact
     cleanly with CVS changes to the main, global source tree.)
  4. Run "sh make.sh" in the same directory where you unpacked the 
     tarball. If you don't already have a SBCL binary installed
     as "sbcl" in your path, you'll need to tell make.sh what Lisp
     system to use as the cross-compilation host. (To use CMU CL
     as the cross-compilation host, run "sh make.sh 'lisp -batch'",
     assuming CMU CL has been installed under its default name "lisp".)
  5. Wait. This can be a slow process. On my test machines, the
     wall clock time for a build of sbcl-0.6.7 was approximately
       1.5 hours on a 450MHz K6/3 with 248Mb RAM, running RH Linux 6.2;
       4 hours on a 200MHz Pentium (P54C) with 64Mb RAM, running FreeBSD 4.0;
       13 hours on a 133MHz Pentium (P54C) with 48Mb RAM, running OpenBSD 2.6.
     Around the 48Mb mark, the build process is starved for RAM:
     on my 48Mb OpenBSD machine with nothing else running, it
     spent about 2/3 of its wall clock time swapping. Anything which 
     substantially increases memory use, like running X11, Emacs, or, 
     God forbid, Netscape, can increase the build time substantially.

Now you should have the same src/runtime/sbcl and output/sbcl.core
files that come with the binary distribution, and you can install
them as in the "IF YOU HAVE A BINARY DISTRIBUTION" instructions (above).

To convert the DocBook version of the system documentation (files
ending in .sgml) to more-readable form (HTML or text):
  DocBook is an abstract markup system based on SGML. It's intended
  to be automatically translated to other formats. Tools to do this
  exist on the web, and are becoming increasingly easy to find as
  more free software projects move their documentation to DocBook.
  Any one of these systems should work with the SBCL documentation.
  If you'd like to have the documentation produced in the same 
  format as appears in the binary distribution, and you have
  the jade binary and Norman Walsh's modular DSSSL stylesheets
  installed, you can try the doc/make-doc.sh script. Otherwise, 
  your formatted copy of the SBCL documentation should have the
  same content as in the binary distribution, but details of
  presentation will probably vary.