Empty else part in AS_IF

[Julien ÉLIE]

Hi,

The following piece of code:

 AS_IF([test x"$var" != xfalse],
     [$test=1],
     [m4_ifdef([AM_CONDITIONAL],
         [AM_CONDITIONAL([TEST], [false])])])

gives the following configure code with autoconf 2.69:

 if test x"$var" != xfalse; then :
  $test=1
else

fi

which is not a valid syntax.
(Here, I do not have automake, so AM_CONDITIONAL is undefined.)


Running configure returns:

./configure: line 23581: syntax error near unexpected token `fi'
./configure: line 23581: `fi'



Is it the expected behaviour of AS_IF when the else part is empty?



A possible workaround I found out to work is to add a no-op [:] else 
part to m4_ifdef:

 AS_IF([test x"$var" != xfalse],
     [$test=1],
     [m4_ifdef([AM_CONDITIONAL],
         [AM_CONDITIONAL([TEST], [false])],
         [:])])

which gives:

 if test x"$var" != xfalse; then :
  $test=1
else
  :
fi




Is it the right thing to do?  What would you otherwise suggest?
Is there something I am missing?


Thanks beforehand,

--
Julien ÉLIE

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