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 <dj@delorie.com> 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 djgpp@delorie.com.

	   You can find the full DJGPP distribution on any SimTel.Net mirror all over the world. Like:

		   ftp://ftp.simtel.net/pub/simtelnet/gnu/djgpp/v2*

	   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

       Perl under DOS lacks some features of perl under UNIX because of deficiencies in the UNIX-emulation, most notably:

       o   fork() and pipe()

       o   some features of the UNIX filesystem regarding link count and file dates

       o   in-place operation is a little bit broken with short filenames

       o   sockets

       Building Perl on DOS

       o   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.

       o   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

       o   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.]

       o   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:

		   configure.bat -des

	   You can find more info about Configure's command line switches in the INSTALL file.

	   When the script ends, and you want to change some values in the generated config.sh file, then run

		   sh Configure -S

	   after you made your modifications.

	   IMPORTANT: if you use this "-S" switch, be sure to delete the CONFIG environment variable before running the script:

		   set CONFIG=

       o   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 con-
       tents 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.  For example:

	       C:djgpp>djtarx -v Text-CSV-0.01.tar.gz

       This will create the new directory "($DJDIR)/Text-CSV-0.01", filling it with the source for this module.

       Building Non-XS Modules on DOS

       To build a non-XS module, you can use the standard module-building instructions distributed with perl modules.

	   perl Makefile.PL
	   make
	   make test
	   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, laszlo.molnar@eth.ericsson.se [Installing/building perl]

       Peter J. Farley III pjfarley@banet.net [Building/installing modules]

SEE ALSO

       perl(1).

perl v5.8.0							    2003-02-18								PERLDOS(1)