[ID 20001027.010] [PATCH] Add info on building CPAN modules toREADME.dos

This is a patch to the current README.dos, primarily to add info on 
building and installing both non-XS and XS CPAN modules under 
DJGPP.  These are needed because DJGPP perl is built statically, so 
extra steps are needed to build and install XS-type modules.  Also 
updated were the minimum DJGPP software versions needed to build and 
install perl.

Please let me know if the attached diff file does not come through or 
fails to patch cleanly.

Peter

-------------Begin patch paste-----------------------------
--- README.dos.orig	Thu Oct 26 14:39:42 2000
+++ README.dos	Fri Oct 27 20:21:16 2000
@@ -9,7 +9,7 @@
  =head1 SYNOPSIS

  These are instructions for building Perl under DOS (or w??), using
-DJGPP v2.01 or later. Under w95 long filenames are supported.
+DJGPP v2.03 or later.  Under w95 long filenames are supported.

  =head1 DESCRIPTION

@@ -22,6 +22,10 @@
  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'.
+
  =head2 Prerequisites

  =over 4
@@ -46,19 +50,19 @@

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

-        v2/djdev202.zip
-        v2/bnu27b.zip
-        v2gnu/gcc2721b.zip
-        v2gnu/bsh1147b.zip
-        v2gnu/mak3761b.zip
+        v2/djdev203.zip
+        v2/bnu2951b.zip
+        v2gnu/gcc2952b.zip
+        v2gnu/bsh204b.zip
+        v2gnu/mak3791b.zip
          v2gnu/fil316b.zip
-        v2gnu/sed118b.zip
-        v2gnu/txt122b.zip
-        v2gnu/dif271b.zip
-        v2gnu/grep21b.zip
+        v2gnu/sed302b.zip
+        v2gnu/txt20b.zip
+        v2gnu/dif272b.zip
+        v2gnu/grep24b.zip
          v2gnu/shl112b.zip
          v2gnu/gawk303b.zip
-        v2misc/csdpmi4b.zip
+        v2misc/csdpmi4b.zip

  or possibly any newer version.

@@ -104,7 +108,7 @@
  tests, don't forget to use

          set LFN=y
-	set FNCASE=y
+        set FNCASE=y

  before unpacking the archive.

@@ -115,6 +119,9 @@

          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 C<SHELL> environment variable point to this F<sh.exe>:

          set SHELL=c:/djgpp/bin/sh.exe (use full path name!)
@@ -131,20 +138,34 @@
  Copy or link F<gecho.exe> to F<echo.exe> if you don't have 
F<echo.exe>.
  Copy or link F<gawk.exe> to F<awk.exe> if you don't have F<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.]
+
  =item *

  Chdir to the djgpp subdirectory of perl toplevel and type the 
following
-command:
+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 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).
+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
@@ -203,9 +224,122 @@
  and the library goes under C<($DJDIR)/lib/perl5>. The pod 
documentation
  goes under C<($DJDIR)/lib/perl5/pod>.

+=head1 BUILDING AND INSTALLING MODULES
+
+
+=head2 Prerequisites
+
+=over 4
+
+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.
+
+=back
+
+=head2 Unpacking CPAN Modules
+
+=over 4
+
+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., C<($DJDIR)/usr/src>), but 
you may
+put it wherever seems most logical to you, *EXCEPT* under the same
+directory as your perl source code.  There are special rules that 
apply
+to modules which live in the perl source tree that do not apply to 
most
+of the modules in CPAN.
+
+Unlike other DJGPP packages, which are normal "zip" files, most CPAN
+module packages are "gzipped tarballs".  Recent versions of WinZip 
will
+safely unpack and expand them, *UNLESS* they have zero-length 
files.  It
+is a known WinZip bug (as of v7.0) that it will not extract 
zero-length
+files.
+
+From the command line, you can use the djtar utility provided with 
DJGPP
+to unpack and expand these files.  For example:
+
+        C:\djgpp>djtarx -v Text-CSV-0.01.tar.gz
+
+This will create the new directory C<($DJDIR)/Text-CSV-0.01>, filling
+it with the source for this module.
+
+=back
+
+=head2 Building Non-XS Modules
+
+To build a non-XS module, you can use the standard module-building
+instructions distributed with perl modules.
+
+=over 4
+
+    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.
+
+=back
+
+=head2 Building XS Modules
+
+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.
+
+=over 4
+
+    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, C<($DJDIR)/bin>, replacing your
+previous perl binary.
+
+Note that the MAP_TARGET value *must* have the ".exe" extension or you
+will not create a "perl.exe" to replace the one in C<($DJDIR)/bin>.
+
+When you are done, the XS-module install process will have added 
information
+to yout "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
+
+=back
+
  =head1 AUTHOR

-Laszlo Molnar, F<laszlo.molnar@eth.ericsson.se>
+Laszlo Molnar, F<laszlo.molnar@eth.ericsson.se> [Installing/building 
perl]
+
+Peter J. Farley III F<pjfarley@banet.net> [Building/installing 
modules]

  =head1 SEE ALSO

-------------End patch paste-------------------------------

• [ID 20001027.010] [PATCH] Add info on building CPAN modules toREADME.dos by Peter J. Farley III
• Re: [ID 20001027.010] [PATCH] Add info on building CPAN modules to README.dos by Jarkko Hietaniemi
• Re: [ID 20001027.010] [PATCH] Add info on building CPANmodules to README.dos by Peter J. Farley III
• Re: [ID 20001027.010] [PATCH] Add info on building CPAN modules to README.dos by Jarkko Hietaniemi