Date: Fri, 16 Aug 96 10:54:51 BST
Message-Id: <9608160954.AA12990@leopard.proteon.com>
From: Neil Jarvis <Neil DOT Jarvis AT proteon DOT com>
To: nleroy AT norland DOT idcnet DOT com
Cc: djgpp AT delorie DOT com
In-Reply-To: <4utagr$k9f@norgate.norland.com> (nleroy@norland.idcnet.com)
Subject: Re: Building DJ cross compiler.
Reply-To: Neil DOT Jarvis AT proteon DOT com
Mime-Version: 1.0 (generated by tm-edit 7.43)
Content-Type: text/plain; charset=US-ASCII

Nick,

I built and have been using a Sun->DJGPP cross compiler for a long
time now, and I wrote down the steps I needed, just in case I had to
do it again....hope these help! 

Note that I did step 4 (and some other cases) to make the --target
description be "i386-msdos-dpmi", rather than the default
"i386-msdos-go32". You may not need to do this.

Share and enjoy,

-- Neil Jarvis, Proteon International R&D, York, UK. (Neil DOT Jarvis AT proteon DOT com)

### How to build a V2.0 DJGPP cross compiler on a Sun
### December 1995, Neil Jarvis

1) Obtain cross-compiler kit file djcrx200.zip

2) Expand ZIP file in the correct place

    cd /usr/local/i386-msdos-dpmi
    unzip -dL djcrx200.zip

3) De-MSDOSify the include files

    #!/usr/local/bin/tcsh
    cd include
    set files = (`find -type f`)
    foreach file ($files)
       dos2unix $file > $file.unix
       mv $file.unix $file
    end

4) Build and install cross-platform binutils
   - Modified the following files to allow i386-msdos-dpmi to be
     accepted as a valid target, instead of i386-msdos-go32
	binutils/config.sub
	binutils/configure.in
        binutils/bfd/aclocal.m4
        binutils/bfd/config.bfd
	binutils/bfd/configure
	binutils/bfd/configure.host
	binutils/gas/configure
	binutils/gas/configure.in
	binutils/ld/configure
	binutils/ld/configure.host
	binutils/ld/configure.tgt
	binutils/libiberty/config.table
   - Configured using
	./configure --host=sparc-sun-sunos4.1.3 --target=i386-msdos-dpmi
   - Built using
        setenv CC gcc-2.7.2
	setenv CFLAGS "-g -O3"
        gmake CC="gcc-2.7.2" CFLAGS="-g -O3"
   - Installed using
        gmake CC="gcc-2.7.2" CFLAGS="-g -O3" install

4) Build cross-platform gcc

   - Make sure gcc/config/i386/go32.h defines HAVE_ATEXIT
   - I modified gcc/configure and gcc/config.sub to accept i386-msdos-dpmi as a
     valid target instead of i386-msdos-go32
   - Configure using
	./configure --host=sparc-sun-sunos4.1.3	--target=i386-msdos-dpmi
   - Built using
        setenv CC gcc-2.7.2
	setenv CFLAGS "-g -O3"
        gmake CC="gcc-2.7.2" CFLAGS="-g -O3"
   - Installed using
        gmake CC="gcc-2.7.2" CFLAGS="-g -O3" install

5) Rebuild stubify to execute on the Sun
   - Add these extra include files to stubify.c, otherwise the
     compiler will complain about SEEK_END and SEEK_CUR being
     undefined.
        #include <sys/types.h>
        #include <unistd.h>
   - Fix file modes for generate file to be 0777, not 0666
        ofile = open(ofilename, O_WRONLY|O_CREAT|O_TRUNC|O_BINARY, 0777);
   - Build with gcc
        gcc-2.7.2 -Wall -g -O3 -o stubify stubify.c
   - Copy the exectuable to /usr/local/i386-msdos-go32/bin/coff2exe.
     Create a logical link from here to
     /usr/local/bin/i386-msdos-go32-coff2exe.

6) Fixup specs
   - File /usr/local/lib/gcc-lib/i386-msdos-dpmi/2.7.2/specs needs to
     be fixed:
   - *cpp section
        Add "-fno-strength-reduce"
   - *cc1plus section
        Add "-fno-strength-reduce"
   - New section *link_command:
        *link_command:
        %{!c:%{!M:%{!MM:%{!E:%{!S:ld %l %X %{o*} %{A} %{d} %{e*} %{m} %{N} %{n} \
        	%{r} %{s} %{t} %{u*} %{x} %{z}\
        	%{!A:%{!nostartfiles:%{!nostdlib:%S}}} %{static:}\
        	%{L*} %D %{T*} %o -Tdjgpp.lnk\
        	%{!nostdlib:-lgcc %L -lgcc %{!A:%E}}}}}}}
        %{!c:%{!M:%{!MM:%{!E:%{!S:i386-msdos-dpmi-coff2exe %{v} %{o*:%*} %{!o*:a.out}}}}}} 
   - *predefines section
        Change "-Dunix -Di386 -DGO32 -DMSDOS -DDJGPP=2 -DDJGPP_MINOR=0 -Asystem(unix) -Asystem(msdos) -Acpu(i386) -Amachine(i386)"

7) Fixup djgpp.lnk
   - File /usr/local/i386-msdos-dpmi/lib/djgpp.lnk. Output format
     parameter should be :
        OUTPUT_FORMAT("coff-i386")

8) Fixup system include files
   - /usr/local/lib/gcc-lib/i386-msdos-dpmi/2.7.2/include/stdio.h
        - Comment out section

                __DJ_va_list
                #undef __DJ_va_list
                #define __DJ_va_list

        - Change fprint and fscanf prototypes to remove "const char
          *_format" parameter

9) Done