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Autoconf's `GUILE_CHECK' macro broken

From: Ludovic Courtès
Subject: Autoconf's `GUILE_CHECK' macro broken
Date: Mon, 12 Sep 2005 17:27:12 +0200
User-agent: Gnus/5.110004 (No Gnus v0.4) Emacs/21.4 (gnu/linux)


It looks like the Autoconf `GUILE_CHECK' macro (or perhaps Guile itself)
is broken.  In both Guile 1.6 and 1.7, it is defined as follows:

  # GUILE_CHECK -- evaluate Guile Scheme code and capture the return value
  # Usage: GUILE_CHECK_RETVAL(var,check)
  # @var{var} is a shell variable name to be set to the return value.
  # @var{check} is a Guile Scheme expression, evaluated with "$GUILE -c", and
  #    returning either 0 or non-#f to indicate the check passed.
  #    Non-0 number or #f indicates failure.
  #    Avoid using the character "#" since that confuses autoconf.
    $GUILE -c "$2" > /dev/null 2>&1

However, both versions of Guile return zero, regardless of whether the
expression passed to `-c' returned false or not.

Actually, my guess would be that Guile is broken, not the macro.  But
then, I'd be surprised to be the first one hitting that problem.


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