the part that didn't fit. If that happens, you should increase the
compilation parameter @code{PURESIZE} in the file
@file{src/puresize.h} and rebuild Emacs, even though the resulting
-image will work. Such an overflow normally won't happen unless you
+image will work: garbage collection is disabled in this situation,
+causing a memory leak. Such an overflow normally won't happen unless you
try to preload additional libraries or add features to the standard
ones. Emacs will display a warning about the overflow when it
starts.
object consists of a header and the storage for the string text
itself; the latter is only allocated when the string is created.)
@end table
+
+If there was overflow in pure space (see the previous section),
+@code{garbage-collect} returns @code{nil}, because a real garbage
+collection can not be done in this situation.
@end deffn
@defopt garbage-collection-messages