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Re: ac 2.68 - AC_LANG_SOURCE
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From: |
Eric Blake |
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Subject: |
Re: ac 2.68 - AC_LANG_SOURCE |
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Date: |
Mon, 04 Apr 2011 09:53:43 -0600 |
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Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.15) Gecko/20110307 Fedora/3.1.9-0.39.b3pre.fc14 Lightning/1.0b3pre Mnenhy/0.8.3 Thunderbird/3.1.9 |
On 04/02/2011 03:11 PM, Ralf Wildenhues wrote:
> Hi Jan,
>
> * Jan Engelhardt wrote on Sat, Apr 02, 2011 at 08:25:49PM CEST:
>> AC_LINK_IFELSE(AC_LANG_SOURCE([int main(void) { return 0; }]))
>>
>> Adding [ ] around AC_LANG_SOURCE would fix it, but I don't see this
>> extra quoting being normally required.
>
> It is required, your assumption is not right.
In particular, if AC_LANG_SOURCE produces any commas, an underquoted
version would end up passing multiple arguments to AC_LINK_IFELSE, where
the quoted version would be a single argument, and the correct behavior
requires a single argument. And while the current body of
AC_LANG_SOURCE doesn't produce any commas unless its argument also had
commas, you can't rely on that behavior in the future.
--
Eric Blake address@hidden +1-801-349-2682
Libvirt virtualization library http://libvirt.org
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