Re: [PATCH] Pass GUILE down to subdirectories

[Tom Tromey <tom@tromey.com>]

Andrew> This change is causing some problems for me.

Yeah, Tom de Vries as well.

Andrew> One of my build machines has 2 versions of guile installed.  One is
Andrew> guile 2.0.14 and the other is guile 2.2.21.

Andrew> When GDB configures itself the configure script figures out that it
Andrew> should use 2.2.21 to compile the guile libraries that GDB uses.

Andrew> However, when we actually build the guile libraries we do use guild2.2,
Andrew> but due to this 'GUILE = guile' line, guild2.2 uses guile 2.0.14 in
Andrew> order to perform the compile (I guess, I don't know the details of how
Andrew> guile compilation works).

Andrew> Unfortunately guile 2.0.14 compiles in a way which is not compatible
Andrew> with how GDB then tries to load the guile library.

I consider this a bug in guile -- it installs 'guild' with this:

    #!/usr/bin/sh
    # -*- scheme -*-
    exec ${GUILE:-/usr/bin/guile2.2} $GUILE_FLAGS -e '(@@ (guild) main)' -s "$0" "$@"
    !#

Allowing a system script to pick $GUILE here seems weird, especially for
a versioned install of "guild", where as you can see it already knows
the correct guile to use.

However -- I think it's better to just work around this.
I plan to back out this change.  Anyone needing to re-run cgen (which
itself ought to come with smarts here, but since it is un-maintained...)
can just specify this by hand.  I.e., the status quo ante.

I'll try to send a patch tomorrow.

Tom