This file was generated automatically from install.texi.
DO NOT CHANGE THIS FILE MANUALLY!

Installing GNU Pascal
*********************

   Contents of this file:

   * Downloading GPC sources or binaries

   * Installation instructions for a GPC binary distribution

   * Compilation of the source distribution on a Unix system

   * Compilation notes for specific platforms

   * Building and installing a cross-compiler

   * Crossbuilding a compiler

   * Getting help

Where and what to download
==========================

   The master server for GNU Pascal is
`agnes.dida.physik.uni-essen.de'. Official and beta releases of the
compiler with sources and binaries for many platforms as well as other
GNU Pascal related files can be found in

     `ftp://agnes.dida.physik.uni-essen.de/gnu-pascal/'

   You can find binary distributions for many platforms in the
subdirectory `binary'. The archive files are named
`gpc-VERSION.PLATFORM.EXTENSION' - for example
`gpc-2.1.alpha-unknown-linux-gnu.tar.gz' for GPC version 2.1 on an
Alpha workstation running the Linux kernel with GNU C Library, or
`gpc-20000616.i586-pc-djgppv201.zip' for GPC version 20000616 on an
i586 PC running DOS with DJGPP version 2.01.

   After you have downloaded the correct archive file for your
platform, please read the installation notes on how to install such a
binary distribution.

   If you are running Dos or MS Windows, you will need additional tools
- see "What else to download and where" below.

Current snapshots
-----------------

   GNU Pascal is subject to steady development. You can download the
current snapshot (source only, use at your own risk) via anonymous FTP
from:

     `ftp://agnes.dida.physik.uni-essen.de/gnu-pascal/alpha/'

or via anonymous CVS from:

     CVS root:
       :pserver:anonymous@agnes.dida.physik.uni-essen.de:/usr/local/cvsroot
     Password:
       anonymous
     Command:
       checkout gpc

   Please read the installation notes on how to compile the source from
a distribution or a CVS checkout.

What else to download and where
-------------------------------

   When you are using GNU Pascal on a DOS system, you will need either
the DJGPP or the EMX development environment (see below). On an OS/2
system, you will need EMX. On an MS Windows 95/98/NT system you will
need either the CygWin or the mingw32 environment.

   GNU Pascal uses the compiler back-end from the GNU Compiler
Collection, GNU CC or GCC. If you want to compile GPC, you will need
the source of GCC as well as the source of GPC itself. For the current
version, please download `version 2.95.x' from a GNU FTP mirror (see
the list on the GNU home page, `http://www.gnu.org/gnu/order/ftp.html',
for the site closest to you).

Libraries
---------

   For some of GPC's units, you will need some standard libraries. In
particular:

Unit             Platform              Library
CRT              Unix/terminal         ncurses >= 5.0 (1), (2)
CRT              Unix/X11              PDCurses (2)
CRT              Dos, MS-Windows       PDCurses (3)
GMP              any                   gmp
RegEx            any                   rx
(debugging)      Unix, MS-Windows      ElectricFence (4)

   Notes:

   (1) ncurses version 5.0 or newer is strongly recommended because
older versions contain a bug that severely affects CRT programs.

   (2) You can install both ncurses and PDCurses on a Unix system, and
choose at compile time whether to generate a terminal or X11 version of
your program.

   (3) ncurses also runs under MS-Windows with CygWin (not mingw32,
however), but doesn't appear to behave much differently from PDCurses
on that platform.

   (4) ElectricFence is not used by any unit, but can be used for
debugging memory allocation bugs by simply linking it (see the
accompanying documentation).

   You can find those libraries on many places on the Net. Also, many
GNU/Linux distributions, DJGPP mirrors and other OS distributions
already contain some of the libraries. In any case, you can find the
sources of the libraries (sometimes together with patches that you
should apply before building if you choose to build from the sources)
and binaries for some platforms in

     `ftp://agnes.dida.physik.uni-essen.de/gnu-pascal/libs/'

DJGPP
-----

   DJGPP (http://www.delorie.com/djgpp/) is available from any SimTel
mirror in the `gnu/djgpp' subdirectory; for FTP addresses look into the
DJGPP FAQ (http://www.delorie.com/djgpp/v2faq/). For using GNU Pascal
you need at least

   - the C library, `v2/djdev201.zip', and

   - `binutils' (assembler, etc.), `v2gnu/bnu270b.zip'.

   We also recommend you to get:

   - the `make' utility, `v2gnu/mak375b.zip'

   - the GNU debugger, `v2gnu/gdb416b.zip'

   - the DJGPP FAQ, `v2faq/faq211b.zip'

   - the GRX graphics library, `http://www.gnu.de/software/GRX/'

   - PENG, `http://fjf.gnu.de/peng.html', an integrated development
     environment, similar to BP's one, written in GNU Pascal, or

   - RHIDE, `v2app/rhide.zip', another integrated development
     environment.

EMX
---

   EMX is an environment for creating 32-bit applications for DOS and
OS/2.  It is available from:

     `http://www.leo.org/pub/comp/os/os2/leo/gnu/emx+gcc/index.html'

   To develop EMX programs with GNU Pascal you need at least

   - the EMX runtime package, `emxrt.zip',

   - the EMX development system, `emxdev*.zip', and

   - the GNU development tools, `gnudev*.zip'.

   If your DOS box has DPMI (it does if you are using MS Windows or
OS/2) you will also need RSX, available from the same sites as EMX in
the subdirectory `rsxnt'.

   The GNU development tools contain the GNU C compiler which is in fact
not needed to use GNU Pascal. However, the C library _is_ needed.

CygWin
------

   CygWin is an environment which implements a POSIX layer under MS
Windows, giving it large parts of the functionality of Unix. CygWin
contains development tools such as an assembler, a linker, etc. GPC
needs for operation. More information about CygWin can be found at:

     `http://www.cygnus.com/cygwin/'

mingw32
-------

   The Minimalists' GNU Win32 environment, mingw32, allows a large
number of Unix programs - including GPC and GCC - to run under MS
Windows 95/98/NT using native MS libraries. mingw32 ressources can be
found at:

     `http://agnes.dida.physik.uni-essen.de/~janjaap/mingw32/'
     `http://www.xraylith.wisc.edu/~khan/software/gnu-win32/'

Installation instructions for a GPC binary distribution
=======================================================

   To install a binary distribution, `cd' to the root directory and
unpack the archive while preserving the stored directory structure.
Under a Unix compatible system with GNU `tar' installed, the following
(performed as `root') will do the job:

     # cd /
     # tar xzf ARCHIVE.tar.gz

   If you are using a `tar' utility other than GNU `tar', it might be
necessary to do the above in an explicit pipe:

     # cd /
     # gzip -c -d ARCHIVE.tar.gz | tar xf -

   If you want to install a GPC binary distribution in another directory
than it was prepared for (for example, if you do not have root access
to the computer and want to install GPC somewhere under your home
directory), you can do the following:

   - Unpack the archive file in a directory of your choice (see above).

   - `cd' to the "prefix" directory of the distribution (for instance
     `usr/local').

   - Run the script `install-gpc-binary', available from
     `ftp://agnes.dida.physik.uni-essen.de/gnu-pascal/current/binary/'.

   - Follow the instructions in the script.

   To install a ZIP archive under DOS with `PKunzip', `cd' the the
appropriate directory (usually `\' for EMX, `\DJGPP' for DJGPP), then
call `PKunzip' with the `-d' option:

     C:\> cd djgpp
     C:\DJGPP> pkunzip -d ARCHIVE.zip

   where `ARCHIVE.zip' is the name of the distribution file.

   For DJGPP you must edit your `djgpp.env' in the `DJGPP' directory to
complete the installation: Please copy the entries from `[gcc]' to
create a new `[gpc]' section. The result may look as follows:

     [gcc]
     COMPILER_PATH=%/>;COMPILER_PATH%%DJDIR%/bin
     LIBRARY_PATH=%/>;LIBRARY_PATH%%DJDIR%/lib
     
     [gpc]
     COMPILER_PATH=%/>;COMPILER_PATH%%DJDIR%/bin
     LIBRARY_PATH=%/>;LIBRARY_PATH%%DJDIR%/lib

   If you are using the DJGPP version of GPC but do not have a `DJGPP'
directory, please download and install DJGPP (see above).

   Binary distributions include `libgcc.a' and `specs', files that are
normally part of GCC. If you have GCC installed, they will be replaced
unless you manually install the archive.

Compiling GPC
=============

   The preferred way to distribute GNU software is distribution of the
source code. However, it can be a non-trivial exercise to build GNU
Pascal on some non-Unix systems, so we also provide ready-to-run
binaries for a number of platforms. (See above for how to install a
binary distribution.)

   GPC is based on the GNU Compiler Collection, GNU CC or GCC. You will
need the GCC sources to build it. It must be the same version as the
one GPC is implemented with - `version 2.95.x' as of this writing.
Although you need GCC to build the GNU Pascal compiler, you don't need
GCC to compile Pascal programs once GNU Pascal is installed. (However,
using certain libraries will require compiling C wrappers, so it is a
good idea to install the C compiler as well.)

   Because GNU Pascal shares its back-end with GCC, it should run on any
system supported by GCC. A full list of platforms supported by GCC can
be found in the GCC installation instructions.

   The GCC source can be obtained from any mirror of the GNU FTP site,
`ftp://ftp.gnu.org/gnu/gcc/'. The "core" distribution is sufficient for
GPC.

   Here is the generic procedure for installing GNU Pascal on a Unix
system. See below for extra information needed to install GPC on
DOS-like platforms.

  1. Checking the prerequisites

     Make sure that GNU make is installed. (In the following, we will
     simply speak of `make' when invoking GNU make; you might need to
     call `gmake' instead.)

     For extracting the example programs from the documentation to the
     `doc/docdemos' directory a non-crippled `sed' is needed.  GNU sed
     is known to work.

     If you have checked out the GPC source from CVS, you will have to
     rebuild most derived files, so you will need additional tools:
     `bison', `flex', `makeinfo', `gperf', and `autoconf'. Make sure
     that these are installed.

     If you want to build the GPC WWW pages you will also need:
     `texi2html' version 1.61 (older versions are missing some needed
     features; newer versions suffer from a bug), `texi2dvi', TeX,
     `gzip', `dvips', `dviselect', and `dviconcat'.

     If you run into trouble during the installation process, please
     check whether you are using outdated versions of the required
     utilities and upgrade if necessary.

     The GNU versions of the packages above are available from the GNU
     FTP server (ftp://ftp.gnu.org) or any of its mirrors.  Package
     PACKAGE is usually located in the directory `gnu/PACKAGE'.

  2. Unpacking the source

     From a directory of your choice (e.g. `/home/fred'), unpack the
     GCC and GNU Pascal source distributions. This will create separate
     subdirectories for GCC and GPC. Let us assume `gcc-2.95.1' and
     `gpc-20000535' in this example.
          % cd /home/fred
          % gzip -c -d gcc-core-2.95.1.tar.gz | tar xf -
          % gzip -c -d gpc-20000535.tar.gz | tar xf -

     `cd' to the GPC directory and move the contents (a subdirectory
     `p') to the subdirectory `gcc' of the GCC directory:

          % cd /home/fred/gpc-20000535
          % mv p /home/fred/gcc-2.95.1/gcc/

     It is recommended, though not required, to use a separate
     directory for building the compiler, rather than compiling in the
     source directory. In this example, let us create
     `/home/fred/gpc-build' for this purpose:

          % mkdir /home/fred/gpc-build

     If you use a separate directory, you do not need to write into the
     GCC source directory once you have patched the GCC source (see
     below), and can build GPC for more than one platform from the same
     source tree.

     In case you are re-using a directory where you have already built
     GCC and/or GPC for a different target machine, do `make distclean'
     to delete all files that might be invalid. One of the files this
     deletes is `Makefile'; if `make distclean' complains that
     `Makefile' does not exist, it probably means that the directory is
     already suitably clean.

  3. Configuring and building GCC

     GNU Pascal is automatically configured with GCC. Configuration of
     GCC is treated in depth in the GCC installation instructions. The
     normal procedure is as follows:

     `cd' to the GPC build directory. From there, run the `configure'
     script in the GCC source directory:

          % cd /home/fred/gpc-build
          % /home/fred/gcc-2.95.1/configure --enable-languages=pascal

     This creates all the necessary config files, links and Makefile in
     the GCC object directory.

     Note 1: The configuration will prompt you for patching the GCC
     source for GPC support, so you need write access to that
     directory. All changes to GCC are surrounded by `#ifdef GPC ...
     #endif', so they should not interfere when you build a C compiler
     from this source tree.

     Note 2: The `--enable-languages=pascal' option means that we only
     want to build the Pascal compiler and not, for instance, the C++
     compiler.

     Note 3: The standard base directory for installing GCC and GPC is
     `/usr/local'. If you want to install files to an alternate
     directory DIR, specify `--prefix=DIR' when you run `configure'.

  4. Putting other GNU tools in place

     Some environments require other GNU tools (such as the GNU
     assembler or linker) instead of the standard system tools for GCC
     to work. (See the GCC installation instructions for details.) If
     this is the case for your system, install the required tools in
     the GPC build directory under the names `as', `ld', or whatever is
     appropriate. This will enable the compiler to find the proper
     tools for compilation of the program `enquire' (a part of GCC) and
     to install the GNU tools to a place where they are found by GCC
     but do not interfere with the standard system tools.

     Alternatively, you can do subsequent compilation using a value of
     the `PATH' environment variable such that the necessary GNU tools
     come before the standard system tools.

  5. Compiling GPC

     Once you are satisfied with the configuration as determined by
     `configure', you can build the compiler:

          % make

     Notice that this procedure will build the C compiler (and maybe
     some other compilers) too, because that is used to compile the GPC
     runtime library.

     Optionally, you may supply CFLAGS, LDFLAGS or RTSFLAGS. CFLAGS is
     used for compiler and RTS, RTSFLAGS are for RTS only, i.e.: `make
     CFLAGS="-O2" RTSFLAGS=-Wall'

  6. Completing the installation

     When everything has been compiled, you can check the installation
     process with:

          % make -n install

     To complete the installation, run the command `make install'. You
     need write access to the target directories (`/usr/local/bin',
     `/usr/local/lib', `/usr/local/info', `/usr/local/doc', and
     `/usr/local/man' in this example), so this is usually done as
     `root':

          % su -c "make install"

     If you want to install _only_ the Pascal compiler (for example if
     you already have the correct version of GCC installed), `cd' to the
     `gcc' subdirectory of the build directory (e.g.
     `/home/fred/gpc-build/gcc') and run `make pascal.install'. This
     installation process does *not* overwrite existing copies of
     `libgcc.a' or `specs', should they exist.

     Also from the `gcc' subdirectory you can do some more "exotic"
     builds. For instance, you can build the GPC WWW pages by typing
     `make pascal.html' or a binary distribution by typing `make
     pascal.bindist'. See the `Makefile' in that directory for more
     examples.

Compilation notes for specific platforms
========================================

MS-DOS with DJGPP
-----------------

   The only compiler that is capable of compiling the GNU Compiler
Collection (GNU CC or GCC) under MS-DOS is GCC itself. In order to
compile GPC or GCC for MS-DOS with DJGPP you will therefore need either
a working copy of DJGPP installed, or you will have to cross-build from
a non-MS-DOS system.

   Building GPC under MS-DOS with DJGPP follows the same scheme as
building GPC under a Unix-like system: Place the `p' subdirectory in the
`gcc' directory and follow the instructions for compiling GCC. This
requires `bash' and many other tools installed, and you must be very
careful at many places to circumvent the limitations of the DOS
platform.

   Our preferred way to build GPC for DJGPP is to cross-build it from a
Unix-like platform - which is much easier. For instructions, see
"Cross-compilers" and "Crossbuilding" below.

MS-DOS or OS/2 with EMX
-----------------------

   EMX is a free 32-bit DOS extender which adds some properties of Unix
to MS-compatible DOS and IBM's OS/2 operating systems.

   As of this writing, we are not aware of current versions of GCC for
EMX, and EMX support in GPC has not been maintained. Please contact us
if you know about recent development in EMX and are interested in
continuing EMX support in GPC.

MS Windows 95/98/NT
-------------------

   There are two ports of the GNU development tools to MS Windows
95/98/NT: CygWin and mingw32.

   The CygWin environment implements a POSIX layer under MS Windows,
giving it large parts of the functionality of Unix. Thus, compiling GCC
and GPC under the CygWin environment can be done following the
instructions for compiling it under a Unix-like system (see above).

   The Minimalists' GNU Win32 environment, mingw32, uses the native
`crtdll.dll' library of MS Winodws. It is much smaller than CygWin, but
it is not self-hosting and must be crossbuilt from another system (see
below).

Building and Installing a cross-compiler
========================================

   GNU Pascal can function as a cross-compiler for many machines.
Information about GNU tools in a cross-configuration can be found at
`ftp://ftp.cygnus.com/pub/embedded/crossgcc/'.

   Since GNU Pascal generates assembler code, you need a cross-assembler
that GNU Pascal can run, in order to produce object files. If you want
to link on other than the target machine, you need a cross-linker as
well. It is straightforward to install the GNU binutils to act as
cross-tools - see the installation instructions of the GNU binutils for
details.

   You also need header files and libraries suitable for the target
machine that you can install on the host machine. Please install them
under `PREFIX/PLATFORM/include/', for instance
`/usr/local/i386-pc-msdosdjgpp/include/' for a cross-compiler from a
typical Unix-like environmant to MS-DOS with DJGPP.

   Configuration and compilation of the compiler can then be done using
the scripts `cfgpc' and `mkgpc' which are included in the source
distribution in the subdirectory `p/script'. Please call them with the
`-h' option for instructions.

Crossbuilding a compiler.
=========================

   Using a cross-compiler to build GNU Pascal results in a compiler
binary that runs on the cross-target platform. This is called
"crossbuilding". A possible reason why anybody would want to do this,
is when the platform on which you want to run the GNU Pascal compiler
is not self-hosting. An example is mingw32.

   To crossbuild GNU Pascal, you have to install a cross-compiler for
your target first, see above.

   As when building a cross-compiler, configuration and compilation of
the compiler can be done using the scripts `cfgpc' and `mkgpc' which
are included in the source distribution in the subdirectory `p/script'.
Please call them with the `-h' option for instructions.

Getting help
============

   If you have further questions, please ask them on the GPC mailing
list, <gpc@gnu.de>. To subscribe to the list, write an email containing
"subscribe gpc" in the body to <majordomo@gnu.de>. (The subject will be
ignored.)

   Have fun with GPC!

