# This function is only for internal use below. It should be called
# using $(eval). It will set up a target so that it recurses into
# a given subdirectory. Note that to avoid a nasty bug in make 3.80,
-# it is important that the expansion of this function not exceed about
-# 200 bytes. This is why we make it apply to just one subdirectory at a
-# time, rather than to a list of subdirectories.
+# this function has to avoid using any complicated constructs (like
+# multiple targets on a line) and also not contain any lines that expand
+# to more than about 200 bytes. This is why we make it apply to just one
+# subdirectory at a time, rather than to a list of subdirectories.
# $1: target name, e.g., all
# $2: subdir name
# $3: target to run in subdir, usually same as $1
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