This is the DJGPP port of gcc-4.2.1

Please read this file up to end (maybe skipping sections You don't need,
for example You don't need to read how to build gcc-4.2.1 from sources
if You only intend to use binary archives). Also consult DJGPP documentation
and FAQ where needed.


Requirements to use this binary release:
    DJGPP-2.03 Patchlevel 2. 
    binutils-2.16 or above (Earlier versions will NOT work any more due to
	incompatible linker scripts as linker script is no more included
	with DJGPP port of GCC)

#########################  NOTE  ##############################################

This update of DJGPP port of DJGPP generates from C++ sources object files 
that are not compatible with ones generated by any earlier releases of DJGPP
ports of GCC before gcc-4.1.0

So it's required to recompile all C++ sources after upgrade if You are 
upgrading from version earlier than 4.1.0

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

Requirements to build gcc-4.2.1 from sources:
    Long filename support. I built it in DOS session under WinXP Pro (SP2).
        Win95, Win98, WinME or Win2K should be Ok. I myself haven't tested
	whether it can be build under Win98, Win2k or Win2K.
    perhaps at least 128Mb of RAM for building (Amount of available
        DPMI memory for DOS session should be set to auto).  
    at least DJGPP-2.03 patchlevel 2 required
    other GNU utilities (see below)


Source archives
===============


Archive gcc421s2.zip contains script which modifies original gcc-4.2.1
and sources for DJGPP. You don't need it unless You want to recreate
GCC source archive for DJGPP. If You are using this archive and original 
sources of gcc-4.2.1.tar.gz, then You don't need gcc421s.zip.
    
The source archive gcc421s.zip contains all the sources to build
all compilers (C, C++, Objective C, Objective C++, GNU Fortran) and also C++
and Fortran libraries (libstdcxx.a, libgpp.a and libg2c.a). 
libg++ is no more supported.

Most users don't need source archives at all.

Binary archives
================

Binary archives are split into 5 parts:

  gcc421b.zip  : The gcc.exe driver program and the C compiler.
                 It also contains the documentation.

  gpp421b.zip  : The C++ compiler and libstdcxx.a together 
                 with needed header files. Please note that one must
		 recompile all C++ sources built with any earlier GCC version

  objc421b.zip : The Objective C and Objective C++ compilers and 
		 libobjc.a and the needed header files.

  gfor421b.zip  : GNU Fortran compiler

  ada421b.zip  : Ada compiler (untested)


The archive gcc421b.zip is required by all other binary packages

Binary packages includes following documentation files:
  
  Archive gcc421b.zip:  
	info/gcc.info - the use and the internals of the GNU compiler
	info/cpp.info - documentation of the GNU C preprocessor.
	info/cppinternals.info  - internals of the GNU C Preprocessor.
        info/gccinstall.info
	info/gccint.info
		(NEW: use install-info to add it to info/dir)
  Archive gpp421b.zip:
        gnu/gcc-4.21/libstdcxx/* - some documentation of libstdc++-v3
		(HTML and text formats)
  Archive gfor421b.zip:
	info/gfortran.info - documentation of the GNU Fortran compiler


Before you install gcc-4.2.1 binaries
======================================

You should remove previous installation of gcc or egcs completely
(unless You really know what You are doing).

Make sure You don't have following files from earlier versions
(relative paths againt to DJGPP directory are given):
	bin/cc1.exe		(from gcc272b.zip or gcc2721b.zip)
	bin/cc1plus.exe		(from gpp272b.zip or gpp2721b.zip)
	lib/libgcc.a		(from gcc272b.zip or gcc2721b.zip)
	lib/libobjc.a		
	lib/specs		(from djdev201.zip or djdev202.zip) 
	lib/libstdcxx.a		
	lib/libgpp.a		

Following packages are required for binaries:
	binutils-2.16 or above. Linker script is no more included in DJGPP
	    release of GCC and all earlier binutils releases for DJGPP
	    had incompatible scripts. SO PLEASE UPGRADE.

	DJGPP-2.03 Patchlevel 2 (djdev203.zip)


Installing binaries of gcc-4.2.1
=================================

Needed archives for different programing languages
	C 			: gcc421b.zip

	C++			: gcc421b.zip, gpp421b.zip

	Fortran	95              : gcc421b.zip, gfor421b.zip

	Objective C		: gcc421b.zip, objc421b.zip

	Ada			: gcc421b.zip, ada421b.zip

Of course for ALL languages You also need at least binutils (bnu215b.zip
or newer) and djdev203.zip (or newer when it will be released)

Unzip all the zip files from that directory, preserving the
directory structure.  For example:

	pkunzip -d djdev203
or
	unzip386 djdev203


NOTE:   For debugging GDB version 6.3 or above is recommended. 
        (gdb-6.3 is not released for DJGPP yet though).


1. Only long filenames
----------------------

Unzip the binaries with an unzip program, which can restore the long filenames
stored in the zip archive.

2. Only short filenames
-----------------------

Unzip the binaries with an unzip program which doesn't know about long
filenames, or if your unzipper knows about them, please follow first
the steps described in the DJGPP FAQ in the section 
about setting the NameNumericTail to 0 __BEFORE__!!! unzipping the archives.

3. Long and short filenames at the same time
--------------------------------------------

Use an unzip program which can restore the long filenames and follow
the instructions under 2. when the unzipper knows about long filenames.


Note for users of C++ IO classes fstream, ifstream, ofstream
============================================================

There is a regression against earlier versions of GCC (gcc-2.95.3 and
earlier): Member functions tellp(), tellg(), seekp() and seekg()
are broken when stream is opened not in binary mode. If You are going
to use any similar functions You should open stream in binary mode.

Don't ask me when it will be fixed as I don't know that. I'm also 
not sure I'll spend much time trying to fix that.


Rebuilding gcc-4.2.1 from the sources
======================================

Requirememts
------------

-  Long filename support is required. It means You should build gcc-4.2.1
   under Win95, Win98, WinME, Win2000 or WinXP. I myself built gcc-4.2.1
   under WinXP.

-  Much of free disk space (more than 1Gb)

-  perhaps 128Mb RAM (or more) to build gcc-4.2.1 under Win9X. 
   DPMI memory amount for DOS session should be set to "Auto".
   Building on machine with only 64 Mb of memory is not tested.
   (I used machine with 1512Mb of memory, operatind system WinXP Pro SP2)
   
-  One must rebuild stubify.exe to use larger stack size. The default
   512Kb is not enough and the build not succeed in that case:
   - download DJGPP runtime sources (djlsr203.zip or djlsr204.zip)
   - patch src/stub/stub.asm to increase stack size to 1Mb
   - rebuild stub and stubify.exe
   See DJGPP FAQ for more information how to build DJGPP from sources.
   stubify.exe is built very soon and further failures caused by incompatibility
   with newer GCC version can safely be ignores.

-  It is recommended to build and install MPFR-2.2.1 or above (http://www.mpfr.org/).
   There is buggy version shipped inside GMP, GCC builds also in that case.

-  Many GNU packages.
	bash-2.0.4 or above
	GNU Diffutils 2.8 
	GNU Fileutils-4.1
	GNU Find 4.1.7
	GNU grep 2.5.1
	GNU Awk 3.1.1
	GNU Make 3.80
	GNU Sed 4.0.7
	GNU shell utils 2.0.11
	GNU Textutils 2.0
	GNU Texinfo 4.8
	GNU tar 1.1.2
	GNU binutils 2.16.1
	GNU gmp 4.1.2 (required to build GNU Fortran compiler)
	working GNU C compiler (perhaps not earlier than gcc-3.3). 

   If You modify some source files You may also need
	autoconf-2.59 or above
	automake-1.9.4 or above
	(for some directories also old autoconf-2.13 and automake-1.5
        may be needed)
	
   You need autoconf and automake also if You are using gcc421s2.zip.
   However it's normally not needed for most users who builds gcc-4.2.1 from
   contents of gcc421s.zip. In that case You need to edit script unpack-gcc
   to specify place where old and new versions of autoconf and automake are
   installed

   Usually newer versions of these packages should also work unless
   otherwise stated above. Older versions may work in some cases, but that
   is not tested

-  INFO-ZIP binary (compiled with DJGPP v2!!!) is needed for using build.sh 
   to create binary distrubution archives. There is no problems to compile 
   it. See http://www.info-zip.org for additional informtion
   about INFO-ZIP. You can find DJGPP compiled binary there. 

-  Working DJGPP installation of course:
	DJGPP-2.03 patchlevel 2 or above, 
	working gcc installation (gcc-3.3.0 or above, You need
                working Ada compiler to build Ada compiler)
   NOTE: gcc-4.2.1 compiled using DJGPP-2.03 Patchelevel 2 must not be
   used with DJGPP-2.04 and otherwise - gcc-4.2.1 compiled using 
   for example recent DJGPP-2.04 CVS version can be used with DJGPP-2.04
   Beta 1 but not with DJGPP-2.03 Patchlevel 2. This must be taken into
   account when compiling gcc-4.2.1 for DJGPP from sources

-  You should have sh.exe in DJGPP bin directory as symbolic link to  
   bash.exe (type 'ln -s bash.exe sh.exe' in that directory)


Extracting the sources
----------------------

At first you should unzip the archive gcc421s.zip. The sources are _NOT_
the complete sources like the original gcc-4.2.1 distribution. I have
removed many files to save disk space which are not needed for the DJGPP
port. However I left configuration of other machines in to make archives
usable to build cross-to-DJGPP compilers and DJGPP hosted cross-compilers
(I haven't tested it).


Compiling gcc
-------------

Directory gnu/gcc-4.21 contains all sources of gcc-4.2.1

Sources are NOT configured. 
	
Change to directory gnu/build.gcc and configure sources
by running script djconfig.sh. 

	sh djconfig.sh

When this is done You can build gcc-4.2.1 by running script djmake.sh
Under Win9X You'll have to restart it some times when it will crash 
due to Win9X DPMI descriptor leaks. You may use redir to get output in file.

	sh djmake.sh bootstrap

When this sucessfully ends run script djinsttmp.sh which installs
all into directory gnu/install.gcc

After that change to this directory and run script makepkg.sh
to create binary distribution packages
	

Installing newly compiled gcc
-----------------------------

It's recommended to install binary packages which are generated 
by makepkg.sh



Available resources
===================

See following URL for additional information:
gcc:		  http://gcc.gnu.org



Reporting bugs
==============

If you found a bug in gcc-4.2.1 (gcc, gfortran, libstdc++, etc) please report it to 
the GCC bug adresses and _NOT_ (or at least not only) in the DJGPP news group. 

But if you think you found a bug in the DJGPP related things, then please 
report it in comp.os.msdos.djgpp (the news group) or mail it to 
djgpp@delorie.com, which is the gateway to the news group.

Some possible situations:
  - gcc says 'Internal compiler error' (or something similar)
       more likely it is error of gcc if it is reproducible. It would 
       be nice to test on some other system (e.g. Linux) and also with 
       different version of compiler if possible and submit report to 
       gcc bug address. 
  - gcc crashes or freezes. 
       In this situation it's hard to guess where is the problem. It may be
       problem with gcc itself but it may be also DJGPP specific one.

Please email me directly only in rare cases, if you think it is only of
interest to me, since I'll see the reports in DJGPP mailing list.


Thanks to
=========

To all who have contributed new features, test results, bugfixes to GCC
(see http://gcc.gnu.org/thanks.html) and also who helped with DJGPP port of 
gcc-4.2.1


Have fun with gcc

Andris Pavenis <andris.pavenis@iki.fi>
