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updated cross-configuration information

    1: Copyright (C) 2003 Free Software Foundation, Inc.
    2: This file is free documentation; the Free Software Foundation gives
    3: unlimited permission to copy, distribute and modify it.
    4: 
    5: 
    6: 		Prerequisites
    7: 
    8: You need gcc version 2.0 or later to compile gforth.  Recommended:
    9: gcc-2.95.* (other versions produce slower code).
   10: 
   11: To use the new C interface, you need to install the ffcall libraries
   12: before configuring Gforth.  You can find them on
   13: 
   14:    ftp://ftp.santafe.edu/pub/gnu/ffcall-1.8.tar.gz (USA) 
   15:    ftp://ftp.ilog.fr/pub/Users/haible/gnu/ffcall-1.8.tar.gz (Europe) 
   16: 
   17: 
   18: 		Building and Installing
   19: 
   20: First, type
   21: 
   22: ./configure
   23: 
   24: (see Section Configuration Options below for details).
   25: 
   26: After configuration, type
   27: 
   28: make
   29: 
   30: Now you can check whether your shiny new Forth system works. Say
   31: 
   32: make check
   33: 
   34: You can run some benchmarks with
   35: 
   36: make bench
   37: 
   38: and compare them with the results in Benchres and in the manual.
   39: 
   40: If everything is all right, you may want to install gforth. Type
   41: 
   42: make install
   43: 
   44: For paper documentation, print gforth.ps (a Postscript file (300dpi
   45: fonts, i.e., it works, but does not produce best quality on better
   46: printers)), or say
   47: 
   48: make gforth.dvi
   49: 
   50: and print the resulting file gforth.dvi. You can also get the
   51: documentation in HTML format by typing
   52: 
   53: make html
   54: 
   55: If you prefer plain ASCII documentation, you can 
   56: 
   57: make doc/gforth.txt
   58: 
   59: or just concatenate the files gforth.info-* ('cat gforth.info-*' under
   60: Unix); the result of the latter option is a little worse.
   61: 
   62: You can find binary distributions, documentation in HTML and plain
   63: text format and information on known installation problems at
   64: http://www.complang.tuwien.ac.at/forth/gforth/.
   65: 
   66: 
   67: 		Configuration Options
   68: 
   69: If you use GNU make, you can build in a directory different from the
   70: source directory by changing to the build directory and invoking
   71: configure thus:
   72: 
   73: $srcdir/configure
   74: 
   75: where $srcdir is the source directory. (Note that we tested this only
   76: for installation; i.e., if you want to hack the Gforth sources, you
   77: should probably build in the source directory).
   78: 
   79: configure has the following useful parameters:
   80:   --prefix=PREFIX         install architecture-independent files in PREFIX
   81:                           [default: /usr/local]
   82:   --exec-prefix=PREFIX    install architecture-dependent files in PREFIX
   83:                           [default: same as prefix]
   84:   --enable-force-reg      Use explicit register declarations if they appear in
   85:                           the machine.h file. This can cause a good speedup,
   86:                           but also incorrect code with some gcc versions on
   87:                           some processors (default disabled).
   88:   --help: tells you about other parameters.
   89: 
   90: The file Benchres shows which combination of the -enable options we
   91: tried gave the best results for various machines.
   92: 
   93: If you don't like the defaults for the installation directories, you
   94: should override them already during configure.  E.g., if you want to
   95: install in the /gnu hierarchy instead of in the default /usr/local
   96: hierarchy, say
   97: 
   98: ./configure --prefix=/gnu
   99: 
  100: Moreover, if your GCC is not called gcc (but, e.g., gcc-2.7.1), you
  101: should say so during configuration. E.g.:
  102: 
  103: ./configure CC=gcc-2.7.1
  104: 
  105: You can also pass additional options to gcc in this way, e.g., if you
  106: want to generate an a.out executable under Linux with gcc-2.7.0:
  107: 
  108: ./configure CC="gcc -b i486-linuxaout -V 2.7.0"
  109: 
  110: You can change the sizes of the various areas used in the default
  111: image `gforth.fi' by passing the appropriate Gforth command line
  112: options in the FORTHSIZES environment variable:
  113: 
  114: ./configure "FORTHSIZES=--dictionary-size=256k --data-stack-size=16k --fp-stack-size=15872b --return-stack-size=15k --locals-stack-size=14848b"
  115: 
  116: The line above reaffirms the default sizes. Note that the locals
  117: stack area is also used as input buffer stack.
  118: 
  119: If C's "long long" do not work properly on your machine (i.e., if the
  120: tests involving double-cell numbers fail), you can build Gforth such
  121: that it does not use "long long":
  122: 
  123: ./configure ac_cv_sizeof_long_long=0
  124: 
  125: 
  126: 			Cross-Installation
  127: 
  128: You need a cross-compilation toolchain for your target including gcc
  129: (2.0 or later).
  130: 
  131: The first step in cross-installation is the cross-configuration.  A
  132: few tests made by the configure script do not work in a
  133: cross-compilation situation. You have to provide the results of these
  134: tests by hand. E.g., if you compile for an ARM:
  135: 
  136: env skipcode=".skip 16" ac_cv_sizeof_char_p=4 ac_cv_sizeof_char=1 \
  137: ac_cv_sizeof_short=2 ac_cv_sizeof_int=4 ac_cv_sizeof_long=4 \
  138: ac_cv_sizeof_long_long=8 ac_cv_sizeof_intptr_t=4 ac_cv_sizeof_int128_t=0 \
  139: ac_cv_c_bigendian=no ./configure CC=arm-elf-gcc --host=arm-linux
  140: 
  141: The ac_cv_sizeof_... variables give the sizes of various C types;
  142: ac_cv_sizeof_char_p is the same as "sizeof(char*)" in C code. The
  143: ac_cv_c_bigendian variable gives the byte order.  The skipcode
  144: specifies how to skip 16 bytes in the code (use "skipcode=no" to
  145: disable skipping and dynamic native code generation).
  146: 
  147: After the cross-configuration you type
  148: 
  149: make gforths
  150: 
  151: This produces the gforth engines for the target.
  152: 
  153: The next step is to transfer everything to the target; on the target,
  154: you do
  155: 
  156: make
  157: 
  158: to complete building gforth.  If you do not have a make on the target,
  159: run
  160: 
  161: make -n
  162: 
  163: on the host; manually execute on the target the last command output by
  164: "make -n" (GFORTHD=...); the other commands output by "make -n" are
  165: not necessary unless you have changed the Gforth sources.  You can
  166: then check and benchmark Gforth with
  167: 
  168: make check
  169: make bench
  170: 
  171: or equivalent.  Finally, perform
  172: 
  173: make install
  174: 
  175: or the equivalent commands on the target.
  176: 
  177: 
  178: 		Preloading installation-specific code
  179: 
  180: If you want to have some installation-specific files loaded when
  181: Gforth starts (e.g., an assembler for your processor), put commands
  182: for loading them into /usr/local/share/gforth/site-forth/siteinit.fs
  183: (if the commands work for all architectures) or
  184: /usr/local/lib/gforth/site-forth/siteinit.fs (for
  185: architecture-specific commands);
  186: /usr/local/lib/gforth/site-forth/siteinit.fs takes precedence if both
  187: files are present (unless you change the search path). The file names
  188: given above are the defaults; if you have changed the prefix, you have
  189: to replace "/usr/local" in these names with your prefix.
  190: 
  191: By default, the installation procedure creates an empty
  192: /usr/local/share/gforth/site-forth/siteinit.fs if there is no such
  193: file.
  194: 
  195: If you change the siteinit.fs file, you should run "make install"
  196: again for the changes to take effect (Actually, the part of "make
  197: install" starting with "rm gforth.fi" is sufficient).
  198: 
  199: 
  200: 		Multiple Versions and Deinstallation
  201: 
  202: Several versions of Gforth can be installed and used at the same
  203: time. Version `foo' can be invoked with `gforth-foo'. We recommend to
  204: keep the old version for some time after a new one has been installed.
  205: 
  206: You can deinstall this version of Gforth with 'make uninstall' and
  207: version foo with 'make uninstall VERSION=foo'. 'make uninstall' also
  208: tells you how to uninstall Gforth completely.
  209: 
  210: 
  211: 		Installing Info Files
  212: 
  213: Info is the GNU project on-line documentation format. You can read
  214: info files either from within Emacs (Ctrl-h i) or using the
  215: stand-alone Info reader, 'info'.
  216: 
  217: If you use the default install root of '/usr/local' then the info
  218: files will be installed in '/usr/local/info'.
  219: 
  220: Many GNU/Linux distributions are set up to put all of their
  221: documentation in '/usr/info', in which case you might have to do a
  222: couple of things to get your environment set up to accommodate files
  223: in both areas:
  224: 
  225: 1. Add an INFOPATH environment variable. The easiest place to do
  226: this is '/etc/profile', right next to PATH and MANPATH:
  227: 
  228: INFOPATH=/usr/local/info:/usr/info
  229: 
  230: 2. Create a file called 'dir' in 'usr/local/info'. Use the file
  231: '/usr/info/dir' as a template. You can add the line for gforth
  232: manually, or use '/sbin/install-info' (man install-info for details).