perl/README.amiga
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   1If you read this file _as_is_, just ignore the funny characters you
   2see. It is written in the POD format (see perlpod manpage) which is
   3specially designed to be readable as is.
   4
   5=head1 NAME
   6
   7perlamiga - Perl under Amiga OS
   8
   9=head1 NOTE
  10
  11B<Perl 5.8.0 cannot be built in AmigaOS.  You can use either the
  12maintenance release Perl 5.6.1 or the development release Perl 5.7.2
  13in AmigaOS.  See L</"PERL 5.8.0 BROKEN IN AMIGAOS"> if you want to help
  14fixing this problem.>
  15
  16=head1 SYNOPSIS
  17
  18One can read this document in the following formats:
  19
  20        man perlamiga
  21        multiview perlamiga.guide
  22
  23to list some (not all may be available simultaneously), or it may
  24be read I<as is>: either as F<README.amiga>, or F<pod/perlamiga.pod>.
  25
  26A recent version of perl for the Amiga can be found at the Geek Gadgets
  27section of the Aminet:
  28
  29      http://www.aminet.net/~aminet/dev/gg
  30
  31=cut
  32
  33Contents
  34 
  35 perlamiga - Perl under Amiga OS
  36
  37       NAME 
  38       SYNOPSIS 
  39       DESCRIPTION 
  40         -  Prerequisites 
  41         -  Starting Perl programs under AmigaOS
  42         -  Shortcomings of Perl under AmigaOS
  43       INSTALLATION 
  44       Accessing documentation 
  45         -  Manpages 
  46         -  HTML 
  47         -  GNU info files 
  48         -  LaTeX docs 
  49       BUILD 
  50         -  Build Prerequisites 
  51         -  Getting the perl source 
  52         -  Application of the patches 
  53         -  Making 
  54         -  Testing 
  55         -  Installing the built perl 
  56       AUTHOR 
  57       SEE ALSO 
  58
  59=head1 DESCRIPTION
  60
  61=head2 Prerequisites for Compiling Perl on AmigaOS
  62
  63=over 6
  64
  65=item B<Unix emulation for AmigaOS: ixemul.library>
  66
  67You need the Unix emulation for AmigaOS, whose most important part is
  68B<ixemul.library>. For a minimum setup, get the latest versions
  69of the following packages from the Aminet archives
  70( http://www.aminet.net/~aminet/ ):
  71
  72        ixemul-bin
  73        ixemul-env-bin
  74        pdksh-bin
  75
  76Note also that this is a minimum setup; you might want to add other
  77packages of B<ADE> (the I<Amiga Developers Environment>).
  78
  79=item B<Version of Amiga OS>
  80
  81You need at the very least AmigaOS version 2.0. Recommended is version 3.1.
  82
  83=back
  84
  85=head2 Starting Perl programs under AmigaOS
  86
  87Start your Perl program F<foo> with arguments C<arg1 arg2 arg3> the
  88same way as on any other platform, by
  89
  90        perl foo arg1 arg2 arg3
  91
  92If you want to specify perl options C<-my_opts> to the perl itself (as
  93opposed to your program), use
  94
  95        perl -my_opts foo arg1 arg2 arg3
  96
  97Alternately, you can try to get a replacement for the system's B<Execute>
  98command that honors the #!/usr/bin/perl syntax in scripts and set the s-Bit
  99of your scripts. Then you can invoke your scripts like under UNIX with
 100
 101        foo arg1 arg2 arg3
 102
 103(Note that having *nixish full path to perl F</usr/bin/perl> is not
 104necessary, F<perl> would be enough, but having full path would make it
 105easier to use your script under *nix.)
 106
 107=head2 Shortcomings of Perl under AmigaOS
 108
 109Perl under AmigaOS lacks some features of perl under UNIX because of
 110deficiencies in the UNIX-emulation, most notably:
 111
 112=over 6
 113
 114=item *
 115
 116fork()
 117
 118=item * 
 119
 120some features of the UNIX filesystem regarding link count and file dates
 121
 122=item *
 123
 124inplace operation (the -i switch) without backup file
 125
 126=item *
 127
 128umask() works, but the correct permissions are only set when the file is
 129finally close()d
 130
 131=back
 132
 133=head1 INSTALLATION
 134
 135Change to the installation directory (most probably ADE:), and
 136extract the binary distribution:
 137
 138lha -mraxe x perl-$VERSION-bin.lha
 139
 140or
 141
 142tar xvzpf perl-$VERSION-bin.tgz
 143
 144(Of course you need lha or tar and gunzip for this.)
 145
 146For installation of the Unix emulation, read the appropriate docs.
 147
 148=head1 Accessing documentation
 149
 150=head2 Manpages for Perl on AmigaOS
 151
 152If you have C<man> installed on your system, and you installed perl
 153manpages, use something like this:
 154
 155        man perlfunc
 156        man less
 157        man ExtUtils.MakeMaker
 158
 159to access documentation for different components of Perl. Start with
 160
 161        man perl
 162
 163Note: You have to modify your man.conf file to search for manpages
 164in the /ade/lib/perl5/man/man3 directory, or the man pages for the
 165perl library will not be found. 
 166
 167Note that dot (F<.>) is used as a package separator for documentation
 168for packages, and as usual, sometimes you need to give the section - C<3>
 169above - to avoid shadowing by the I<less(1) manpage>.
 170
 171
 172=head2 Perl HTML Documentation on AmigaOS
 173
 174If you have some WWW browser available, you can build B<HTML> docs.
 175Cd to directory with F<.pod> files, and do like this
 176
 177        cd /ade/lib/perl5/pod
 178        pod2html
 179
 180After this you can direct your browser the file F<perl.html> in this
 181directory, and go ahead with reading docs.
 182
 183Alternatively you may be able to get these docs prebuilt from C<CPAN>.
 184
 185=head2 Perl GNU Info Files on AmigaOS
 186
 187Users of C<Emacs> would appreciate it very much, especially with
 188C<CPerl> mode loaded. You need to get latest C<pod2info> from C<CPAN>,
 189or, alternately, prebuilt info pages.
 190
 191=head2 Perl LaTeX Documentation on AmigaOS
 192
 193Can be constructed using C<pod2latex>.
 194
 195=head1 BUILDING PERL ON AMIGAOS
 196
 197Here we discuss how to build Perl under AmigaOS.
 198
 199=head2 Build Prerequisites for Perl on AmigaOS
 200
 201You need to have the latest B<ixemul> (Unix emulation for Amiga)
 202from Aminet.
 203
 204=head2 Getting the Perl Source for AmigaOS
 205
 206You can either get the latest perl-for-amiga source from Ninemoons
 207and extract it with:
 208
 209  tar xvzpf perl-$VERSION-src.tgz
 210
 211or get the official source from CPAN:
 212
 213  http://www.cpan.org/src/5.0
 214
 215Extract it like this
 216
 217  tar xvzpf perl-$VERSION.tar.gz
 218
 219You will see a message about errors while extracting F<Configure>. This
 220is normal and expected. (There is a conflict with a similarly-named file
 221F<configure>, but it causes no harm.)
 222
 223=head2 Making Perl on AmigaOS
 224
 225Remember to use a hefty wad of stack (I use 2000000)
 226
 227  sh configure.gnu --prefix=/gg
 228
 229Now type
 230
 231  make depend
 232
 233Now!
 234
 235  make
 236
 237=head2 Testing Perl on AmigaOS
 238
 239Now run
 240
 241  make test
 242
 243Some tests will be skipped because they need the fork() function:
 244
 245F<io/pipe.t>, F<op/fork.t>, F<lib/filehand.t>, F<lib/open2.t>, F<lib/open3.t>, 
 246F<lib/io_pipe.t>, F<lib/io_sock.t>
 247
 248=head2 Installing the built Perl on AmigaOS
 249
 250Run
 251
 252  make install
 253
 254=head1 PERL 5.8.0 BROKEN IN AMIGAOS
 255
 256As told above, Perl 5.6.1 was still good in AmigaOS, as was 5.7.2.
 257After Perl 5.7.2 (change #11423, see the Changes file, and the file
 258pod/perlhack.pod for how to get the individual changes) Perl dropped
 259its internal support for vfork(), and that was very probably the step
 260that broke AmigaOS (since the ixemul library has only vfork).  
 261The build finally fails when the ext/DynaLoader is being built, and
 262PERL ends up as "0" in the produced Makefile, trying to run "0" does
 263not quite work.  Also, executing miniperl in backticks seems to
 264generate nothing: very probably related to the (v)fork problems.
 265B<Fixing the breakage requires someone quite familiar with the ixemul
 266library, and how one is supposed to run external commands in AmigaOS
 267without fork().>
 268
 269=head1 AUTHORS
 270
 271Norbert Pueschel, pueschel@imsdd.meb.uni-bonn.de
 272Jan-Erik Karlsson, trg@privat.utfors.se
 273
 274=head1 SEE ALSO
 275
 276perl(1).
 277
 278=cut
 279
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