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Re: Empty else part in AS_IF

From: Russ Allbery
Subject: Re: Empty else part in AS_IF
Date: Thu, 10 Oct 2013 15:41:11 -0700
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.4 (gnu/linux)

Eric Blake <address@hidden> 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?

Russ Allbery (address@hidden)             <>

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