Date: Sun, 06 May 2001 20:15:45 +0300
From: "Eli Zaretskii" <eliz AT is DOT elta DOT co DOT il>
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To: jeffw AT darwin DOT sfbr DOT org
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CC: djgpp AT delorie DOT com
In-reply-to: <20010506112025.A21215@kendall.sfbr.org> (message from JT
	Williams on Sun, 6 May 2001 11:20:25 -0500)
Subject: Re: __DJGPP__ and MSDOS
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> Date: Sun, 6 May 2001 11:20:25 -0500
> From: JT Williams <jeffw AT darwin DOT sfbr DOT org>
> 
> Ok, I realize I'm long overdue for a gcc upgrade.  Let's say I install
> gcc 2.95.3.  In the README Andris warns against keeping an old gcc
> installation around (unless you know what you are doing).  But given that
> a gcc 2.7.2.1 installation requires only half a dozen files and doesn't
> assume the directory structure of later gcc's, wouldn't it be relatively
> simple to keep the 2.7.2.1 compiler in addition to the 2.95.3 setup?
> Any suggestions on how to arrange this?

Try this:

  - Rename the old gcc.exe to gcc2721.exe.

  - Create a directory lib/gcc-lib/djgpp/2.721/ and move the old
    cpp.exe, cc1.exe, and cc1plus.exe from bin to this new directory.
    Move the old lib/libgcc.a and lib/specs to that directory as well.

  - Rename the old lang/ directory to lang-2.721/.

  - Edit djgpp.env and add a [gcc2721] section with this content:

    [gcc2721]
    COMPILER_PATH=%DJDIR%/lib/gcc-lib/djgpp/2.721/
    LIBRARY_PATH=%/>;LIBRARY_PATH%%DJDIR%/lib/gcc-lib/djgpp/2.721;%DJDIR%/lib
    CPLUS_INCLUDE_PATH=%/>;CPLUS_INCLUDE_PATH%%DJDIR%/lang-2.721/cxx;%DJDIR%/include

    (Note the trailing slash in the value of COMPILER_PATH: it's
    important!)

Thereafter, you should be able to invoke the old compiler as
"gcc2721".

This is untested, so caveat emptor!  (And please tell me if it works ;-)