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scm_cell vs threads build option

From: Kevin Ryde
Subject: scm_cell vs threads build option
Date: Sun, 02 Sep 2007 10:33:37 +1000
User-agent: Gnus/5.110007 (No Gnus v0.7) Emacs/22.1 (gnu/linux)

I gave Rob's new debian packaged 1.8.2 a go and found a bit of a problem
with scm_cell.  The new packages have threads enabled, where the old
ones had it disabled, and alas that setting infects the inlined
scm_cell().  If you built your app against the old and run it against
the new then it bombs on SCM_FREELIST_LOC doing the different "thread
key" thingie access.

I guess scm_cell has been inlined that way for a while, but it'd be
worth thinking about not inlining it, or only inlining for internal
uses, in the interests of binary compatibility among as many build
options as possible.

I struck the problem in my own build of guile-gtk, not sure what
packaged stuff might be affected.  gnome-games seems ok.  Anything using
smobs probably isn't.

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