perldos - Perl under DOS, W31, W95. at Linux.org

Back to main site | Back to man page index

PERLDOS(1) Perl Programmers Reference Guide PERLDOS(1)

NAME
perldos - Perl under DOS, W31, W95.

SYNOPSIS
These are instructions for building Perl under DOS (or w??), using DJGPP v2.03 or later. Under w95 long
filenames are supported.

DESCRIPTION
Before you start, you should glance through the README file found in the top-level directory where the Perl
distribution was extracted. Make sure you read and understand the terms under which this software is being
distributed.

This port currently supports MakeMaker (the set of modules that is used to build extensions to perl).
Therefore, you should be able to build and install most extensions found in the CPAN sites.

Detailed instructions on how to build and install perl extension modules, including XS-type modules, is
included. See 'BUILDING AND INSTALLING MODULES'.

Prerequisites for Compiling Perl on DOS
DJGPP
DJGPP is a port of GNU C/C++ compiler and development tools to 32-bit, protected-mode environment on Intel
32-bit CPUs running MS-DOS and compatible operating systems, by DJ Delorie <[email protected]> and friends.

For more details (FAQ), check out the home of DJGPP at:

http://www.delorie.com/djgpp/

If you have questions about DJGPP, try posting to the DJGPP newsgroup: comp.os.msdos.djgpp, or use the
email gateway [email protected].

You can find the full DJGPP distribution on any of the mirrors listed here:

http://www.delorie.com/djgpp/getting.html

You need the following files to build perl (or add new modules):

v2/djdev203.zip
v2gnu/bnu2112b.zip
v2gnu/gcc2953b.zip
v2gnu/bsh204b.zip
v2gnu/mak3791b.zip
v2gnu/fil40b.zip
v2gnu/sed3028b.zip
v2gnu/txt20b.zip
v2gnu/dif272b.zip
v2gnu/grep24b.zip
v2gnu/shl20jb.zip
v2gnu/gwk306b.zip
v2misc/csdpmi5b.zip

or possibly any newer version.

Pthreads
Thread support is not tested in this version of the djgpp perl.

Shortcomings of Perl under DOS

· Unpack the source package perl5.8*.tar.gz with djtarx. If you want to use long file names under w95 and
also to get Perl to pass all its tests, don't forget to use

set LFN=y
set FNCASE=y

before unpacking the archive.

· Create a "symlink" or copy your bash.exe to sh.exe in your "($DJDIR)/bin" directory.

ln -s bash.exe sh.exe

[If you have the recommended version of bash for DJGPP, this is already done for you.]

And make the "SHELL" environment variable point to this sh.exe:

set SHELL=c:/djgpp/bin/sh.exe (use full path name!)

You can do this in djgpp.env too. Add this line BEFORE any section definition:

+SHELL=%DJDIR%/bin/sh.exe

· If you have split.exe and gsplit.exe in your path, then rename split.exe to djsplit.exe, and gsplit.exe to
split.exe. Copy or link gecho.exe to echo.exe if you don't have echo.exe. Copy or link gawk.exe to
awk.exe if you don't have awk.exe.

[If you have the recommended versions of djdev, shell utilities and gawk, all these are already done for
you, and you will not need to do anything.]

· Chdir to the djgpp subdirectory of perl toplevel and type the following commands:

set FNCASE=y
configure.bat

This will do some preprocessing then run the Configure script for you. The Configure script is
interactive, but in most cases you just need to press ENTER. The "set" command ensures that DJGPP
preserves the letter case of file names when reading directories. If you already issued this set command
when unpacking the archive, and you are in the same DOS session as when you unpacked the archive, you
don't have to issue the set command again. This command is necessary *before* you start to (re)configure
or (re)build perl in order to ensure both that perl builds correctly and that building XS-type modules can
succeed. See the DJGPP info entry for "_preserve_fncase" for more information:

info libc alphabetical _preserve_fncase

If the script says that your package is incomplete, and asks whether to continue, just answer with Y (this
can only happen if you don't use long filenames or forget to issue "set FNCASE=y" first).

When Configure asks about the extensions, I suggest IO and Fcntl, and if you want database handling then
SDBM_File or GDBM_File (you need to install gdbm for this one). If you want to use the POSIX extension
(this is the default), make sure that the stack size of your cc1.exe is at least 512kbyte (you can check
this with: "stubedit cc1.exe").

You can use the Configure script in non-interactive mode too. When I built my perl.exe, I used something
like this:
the script:

set CONFIG=

· Now you can compile Perl. Type:

make

Testing Perl on DOS
Type:

make test

If you're lucky you should see "All tests successful". But there can be a few failed subtests (less than 5
hopefully) depending on some external conditions (e.g. some subtests fail under linux/dosemu or plain dos with
short filenames only).

Installation of Perl on DOS
Type:

make install

This will copy the newly compiled perl and libraries into your DJGPP directory structure. Perl.exe and the
utilities go into "($DJDIR)/bin", and the library goes under "($DJDIR)/lib/perl5". The pod documentation goes
under "($DJDIR)/lib/perl5/pod".

BUILDING AND INSTALLING MODULES ON DOS
Building Prerequisites for Perl on DOS
For building and installing non-XS modules, all you need is a working perl under DJGPP. Non-XS modules do not
require re-linking the perl binary, and so are simpler to build and install.

XS-type modules do require re-linking the perl binary, because part of an XS module is written in "C", and has
to be linked together with the perl binary to be executed. This is required because perl under DJGPP is built
with the "static link" option, due to the lack of "dynamic linking" in the DJGPP environment.

Because XS modules require re-linking of the perl binary, you need both the perl binary distribution and the
perl source distribution to build an XS extension module. In addition, you will have to have built your perl
binary from the source distribution so that all of the components of the perl binary are available for the
required link step.

Unpacking CPAN Modules on DOS
First, download the module package from CPAN (e.g., the "Comma Separated Value" text package,
Text-CSV-0.01.tar.gz). Then expand the contents of the package into some location on your disk. Most CPAN
modules are built with an internal directory structure, so it is usually safe to expand it in the root of your
DJGPP installation. Some people prefer to locate source trees under /usr/src (i.e., "($DJDIR)/usr/src"), but
you may put it wherever seems most logical to you, *EXCEPT* under the same directory as your perl source code.
There are special rules that apply to modules which live in the perl source tree that do not apply to most of
the modules in CPAN.

Unlike other DJGPP packages, which are normal "zip" files, most CPAN module packages are "gzipped tarballs".
Recent versions of WinZip will safely unpack and expand them, *UNLESS* they have zero-length files. It is a
known WinZip bug (as of v7.0) that it will not extract zero-length files.

From the command line, you can use the djtar utility provided with DJGPP to unpack and expand these files.

make install

This is sufficient because non-XS modules install only ".pm" files and (sometimes) pod and/or man
documentation. No re-linking of the perl binary is needed to build, install or use non-XS modules.

Building XS Modules on DOS
To build an XS module, you must use the standard module-building instructions distributed with perl modules
*PLUS* three extra instructions specific to the DJGPP "static link" build environment.

set FNCASE=y
perl Makefile.PL
make
make perl
make test
make -f Makefile.aperl inst_perl MAP_TARGET=perl.exe
make install

The first extra instruction sets DJGPP's FNCASE environment variable so that the new perl binary which you
must build for an XS-type module will build correctly. The second extra instruction re-builds the perl binary
in your module directory before you run "make test", so that you are testing with the new module code you
built with "make". The third extra instruction installs the perl binary from your module directory into the
standard DJGPP binary directory, "($DJDIR)/bin", replacing your previous perl binary.

Note that the MAP_TARGET value *must* have the ".exe" extension or you will not create a "perl.exe" to replace
the one in "($DJDIR)/bin".

When you are done, the XS-module install process will have added information to your "perllocal" information
telling that the perl binary has been replaced, and what module was installed. You can view this information
at any time by using the command:

perl -S perldoc perllocal

AUTHOR
Laszlo Molnar, [email protected] [Installing/building perl]

Peter J. Farley III [email protected] [Building/installing modules]