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From:	fdjhngslgsgh AT hotmail DOT com (os_dev)
Newsgroups:	comp.os.msdos.djgpp,alt.os.development
Subject:	Port/Recompile GCC (using DJGPP)
Date:	21 Apr 2004 01:42:39 -0700
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To:	djgpp AT delorie DOT com
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Reply-To:	djgpp AT delorie DOT com

Hey,

I have a question about recompiling GCC, hope somebody can help me
with this.
I was trying to port GCC to another OS (some hobby OS so I can't use
any pre-existing configure options).
I already have a LibC + include files which should contain all the
functions needed to compile GCC/Binutils (standard i/o, process,
etc.). But my problem is that I don't really know where to start. I
decided to try to recompile everything under Win/DOS using DJGPP since
I use this platform to compile most of my programs. I first tried to
recompile GCC to normal .exe-files by following the steps in
DJGPP/GNU/GCC-3.33/README.DJGPP. This works OK, and after a few
minutes of compiling and configuring I get new .exe-files. But these
are (naturally) MS-DOS executables linked to the DJGPP LibC. What I
want is the compiler to link all the new output files it produces to
my own LibC and output a COFF or ELF executable, not a MS-DOS
GO32-EXE.

I tried the following already, which works perfectly for Binutils:

Replace DJGPP/LIB/LIBC.A by MyLibc.A
Replace DJGPP/INCLUDE/*.h files by MyIncludeFiles/*.h
Edit DJGPP/LIB/GCC-LIB/DJGPP/3.33/DJGPP-X.DJL:

 OUTPUT_FORMAT("coff")
 ENTRY(_START) <- Entry point for MyLibc
 SECTIONS
 {
	.... section info ...
 }

All files that are compiled now by `gcc' are COFF executables
statically linked to MyLibc.A, so these files can be run on the other
OS.
When I run configure with these changes a config.h-file is created
with the right settings for the other OS, and when I run make, the
binutils compile correctly into COFF executables which can be run on
the other OS.
But this doesn't work for compiling GCC: during the make process of
GCC some MS-DOS .exe files are created (gen*.exe, such as genemit.exe)
which are needed during the make process (?). So if I use the same
trick to compile GCC as I did with the binutils, these files are also
compiled to COFF executables and thus cannot be run during the make
process and 'make' will therefore fail.

If there some other way I can solve this? Makeing a cross compiler
seems to be no problem, but recompiling the GCC executables to another
target is.

Thanks for reading all this :)

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