Add more rumination on caching canonicals.

diff --git a/TODO b/TODO
index 340e86d00edff3c3e0ff2cef7fe4bd15443ee182..d10bcb910fbfc41340ca2eeeddd55a5628b7e233 100644 (file)
--- a/TODO
+++ b/TODO
@@ -114,6 +114,10 @@ substitutions done on them.
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 Have AC_CANONICAL_* cache the host/build/target types.
+They have to be overridden by the command line arguments,
+just as for X includes and libraries.  Should they be cached
+all in one variable, or three?  In that case, what if only one
+or two of the cache variables are set?
 
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