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PERLMINT(1)	       Perl Programmers Reference Guide		   PERLMINT(1)

NAME
       README.mint - Perl version 5 on Atari MiNT

DESCRIPTION
       There is a binary version of perl available from the FreeMiNT project
       http://freemint.de/  You may wish to use this instead of trying to
       compile yourself.

       The following advice is from perl 5.004_02 and is probably rather out
       of date.

       If you want to build perl yourself on MiNT (or maybe on an Atari
       without MiNT) you may want to accept some advice from somebody who
       already did it...

       There was a perl port for Atari ST done by ++jrb bammi@cadence.com.
       This port tried very hard to build on non-MiNT-systems.	For the sake
       of efficiency I've left this way.  Yet, I haven't removed bammi's
       patches but left them intact.  Unfortunately some of the files that
       bammi contributed to the perl distribution seem to have vanished?

       So, how can you distinguish my patches from bammi's patches?  All of
       bammi's stuff is embedded in "#ifdef atarist" preprocessor macros.  My
       MiNT port uses "#ifdef __MINT__" instead (and unconditionally undefines
       "atarist".  If you want to continue on bammi's port, all you have to do
       is to swap the "-D" and "-U" switches for "__MINT__" and "atarist" in
       the variable ccflags.

       However, I think that my version will still run on non-MiNT-systems
       provided that the user has a Eunuchs-like environment (i.e. the
       standard envariables like $PATH, $HOME, ... are set, there is a POSIX
       compliant shell in /bin/sh, and...)

Known problems with Perl on MiNT
       The problems you may encounter when building perl on your machine are
       most probably due to deficiencies in MiNT resp. the Atari platform in
       general.

       First of all, if you have less than 8 MB of RAM you shouldn't even try
       to build Perl yourself.	Better grab a binary pre-compiled version
       somewhere.  Even if you have more memory you should take some care.
       Try to run in a fresh environment (without memory fragmented too much)
       with as few daemons, accessories, xcontrol modules etc. as possible.
       If you run some AES you should consider to start a console based
       environment instead.

       A problem has been reported with sed.  Sed is used to create some
       configuration files based on the answers you have given to the
       Configure script.  Unfortunately the Perl Configure script shows sed on
       MiNT its limits.	 I have sed 2.05 with a stacksize of 64k and I have
       encountered no problems.	 If sed crashes during your configuration
       process you should first try to augment sed's stacksize:

	       fixstk 64k /usr/bin/sed

       (or similar).  If it still doesn't help you may have a look which other
       versions of sed are installed on your system.  If you have a KGMD 1.0
       installation you will find three in /usr/bin.  Have a look there.

       Perl has some "mammut" C files.	If gcc reports "internal compiler
       error: program cc1 got fatal signal 10" this is very likely due to a
       stack overflow in program cc1. Find cc1 and fix its stack.  I have made
       good experiences with

	       fixstk 2 cc1

       This doesn't establish a stack of 2 Bytes only as you might think.  It
       really reserves one half of the available memory for cc1's stack.  A
       setting of 1 would reserve the entire memory for cc1, 3 would reserve
       three fourths.  You will have to find out the value that suits to your
       system yourself.

       To find out the location of the program "cc1" simply type `gcc
       --print-prog-name cc1' at your shell prompt.

       Now run make (maybe "make -k").	If you get a fatal signal 10 increase
       cc1's stacksize, if you run out of memory you should either decrease
       the stacksize or follow some more hints:

       Perl's building process is very handy on machines with a lot of virtual
       memory but may result in a disaster if you are short of memory.	If gcc
       fails to compile many source files you should reduce the optimization.
       Grep for "optimize" in the file config.sh and change the flags.

       If only several huge files cause problems (actually it is not a matter
       of the file size resp. the amount of code but depends on the size of
       the individual functions) it is useful to bypass the make program and
       compile these files directly from the command line.  For example if you
       got something like the following from make:

	       CCCMD = gcc -DPERL_CORE ....
	       ...
	       ...: virtual memory exhausted

       you should hack into the shell:

	       gcc -DPERL_CORE ... toke.c

       Please note that you have to add the name of the source file (here
       toke.c) at the end.

       If none of this helps, you're helpless.	Wait for a binary release.  If
       you have succeeded you may encounter another problem at the linking
       process.	 If gcc complains that it can't find some libraries within the
       perl distribution you probably have an old linker.  If it complains for
       example about "file not found for xxx.olb" you should cd into the
       directory in question and

	       ln -s libxxx.a xxx.olb

       This will fix the problem.

       This version (5.00402) of perl has passed most of the tests on my
       system:

	Failed Test  Status Wstat Total Fail  Failed  List of failed
	------------------------------------------------------------------------------
	io/pipe.t		     10	   2  20.00%  7, 9
	io/tell.t		     13	   1   7.69%  12
	lib/complex.t		    762	  13   1.71%  84-85, 248-251, 257, 272-273,
						      371, 380, 419-420
	lib/io_pipe.t		     10	   1  10.00%  9
	lib/io_tell.t		     13	   1   7.69%  12
	op/magic.t		     30	   2   6.67%  29-30
	Failed 6/152 test scripts, 96.05% okay. 20/4359 subtests failed, 99.54% okay.

       Pipes always cause problems with MiNT, it's actually a surprise that
       most of the tests did work.  I've got no idea why the "tell" test
       failed, this shouldn't mean too big a problem however.

       Most of the failures of lib/complex seem to be harmless, actually
       errors far right to the decimal point...	 Two failures seem to be
       serious: The sign of the results is reversed.  I would say that this is
       due to minor bugs in the portable math lib that I compiled perl with.

       I haven't bothered very much to find the reason for the failures with
       op/magic.t and op/stat.t.  Maybe you'll find it out.

       ##########################################################################

       Another possible problem may arise from the implementation of the "pwd"
       command.	 It happened to add a carriage return and newline to its
       output no matter what the setting of $UNIXMODE is.  This is quite
       annoying since many library modules for perl take the output of pwd,
       chop off the trailing newline character and then expect to see a valid
       path in that.  But the carriage return (last but second character!)
       isn't chopped off.  You can either try to patch all library modules (at
       the price of performance for the extra transformation) or you can use
       my version of pwd that doesn't suffer from this deficiency.

       The fixed implementation is in the mint subdirectory.  Running
       "Configure" will attempt to build and install it if necessary
       (hints/mint.sh will do this work) but you can build and install it
       explicitly by:

	       cd mint
	       make install

       This is the fastest solution.

       Just in case you want to go the hard way: perl won't even build with a
       broken pwd!  You will have to fix the library modules
       (ext/POSIX/POSIX.pm, lib/Cwd.pm, lib/pwd.pl) at last after building
       miniperl.

       A major nuisance of current MiNTLib versions is the implementation of
       system() which is far from being POSIX compliant.  A real system()
       should fork and then exec /bin/sh with its argument as a command line
       to the shell.  The MiNTLib system() however doesn't expect that every
       user has a POSIX shell in /bin/sh.  It tries to work around the problem
       by forking and exec'ing the first token in its argument string.	To get
       a little bit of compliance to POSIX system() it tries to handle at
       least redirection ("<" or ">") on its own behalf.

       This isn't a good idea since many programs expect that they can pass a
       command line to system() that exploits all features of a POSIX shell.
       If you use the MiNTLib version of system() with perl the Perl function
       system() will suffer from the same deficiencies.

       You will find a fixed version of system() in the mint subdirectory.
       You can easily insert this version into your system libc:

	       cd mint
	       make system.o
	       ar r /usr/lib/libc.a
	       ranlib /usr/lib/libc.a

       If you are suspicious you should either back up your libc before or
       extract the original system.o from your libc with "ar x /usr/lib/libc.a
       system.o".  You can then backup the system.o module somewhere before
       you succeed.

       Anything missing?  Yep, I've almost forgotten...	 No file in this
       distribution without a fine saying.  Take this one:

	       "From a thief you should learn: (1) to work at night;
	       (2) if one cannot gain what one wants in one night to
	       try again the next night; (3) to love one's coworkers
	       just as thieves love each other; (4) to be willing to
	       risk one's life even for a little thing; (5) not to
	       attach too much value to things even though one has
	       risked one's life for them - just as a thief will resell
	       a stolen article for a fraction of its real value;
	       (6) to withstand all kinds of beatings and tortures
	       but to remain what you are; and (7) to believe your
	       work is worthwhile and not be willing to change it."

			       -- Rabbi Dov Baer, Maggid of Mezeritch

       OK, this was my motto while working on Perl for MiNT, especially rule
       (1)...

       Have fun with Perl!

AUTHOR
       Guido Flohr

	       mailto:guido@FreeMiNT.de

perl v5.10.1			  2009-02-12			   PERLMINT(1)
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