In
http://www.gnu.org/software/autoconf/manual/autoconf.html#Conditional-constructs
, under the definition for m4_ifval, I believe the following clause is
erroneous:
This is shorthand for:
m4_if([cond], [], [if-true], [if-false])
Since the latter expands to if-true if cond is empty, while the definition for
m4_ifval says m4_ifval([cond], [if-true], [if-false]) expands to if-true if
cond is NOT empty.
This was rather confusing and I had to verify the correct behaviour via a
configure.ac template.
Hope this is corrected.
Thanks,
Mostafa
