On 10/10/2013 04:41 PM, Russ Allbery wrote: > Eric Blake <eblake@xxxxxxxxxx> writes: > >> Another solution is to ensure that AM_CONDITIONAL is always defined >> (where its definition is a no-op if using an old automake that did not >> already define it): > >> m4_define_default([AM_CONDITIONAL]) >> AS_IF([test x"$var" != xfalse], >> [$test=1], >> [AM_CONDITIONAL([TEST], [false])]) > > This would reintroduce the same problem, though, wouldn't it? > AM_CONDITIONAL would expand to nothing, and then the else branch of AS_IF > would be empty. Or does this give AS_IF enough information to figure that > out because it avoids using the lower-level m4_* function? If that's the case, then write AM_CONDITIONAL so that it always produces a shell statement: m4_define_default([AM_CONDITIONAL], [:]) -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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