[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Empty else part in AS_IF
From: |
Eric Blake |
Subject: |
Re: Empty else part in AS_IF |
Date: |
Thu, 10 Oct 2013 16:45:33 -0600 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.0 |
On 10/10/2013 04:41 PM, Russ Allbery wrote:
> 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?
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
signature.asc
Description: OpenPGP digital signature
Re: Empty else part in AS_IF, Russ Allbery, 2013/10/10