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Re: Aw: Re: Supressing output from AC_CHECK_DECL
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From: |
Eric Blake |
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Subject: |
Re: Aw: Re: Supressing output from AC_CHECK_DECL |
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Date: |
Tue, 08 May 2007 18:15:41 -0600 |
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Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.10) Gecko/20070221 Thunderbird/1.5.0.10 Mnenhy/0.7.5.666 |
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According to william pursell on 5/8/2007 2:53 PM:
> Being fairly new to autoconf, I would like to get some
> feedback on my first thought for a solution. In particular,
> I suspect that my approach is not good, but I'd love
> to hear opinions on why it is not advisable:
>
> exec 6> /dev/null
> AC_CHECK_DECL(printf)
> exec 6>& 1
You have no idea if 6 is the fd that autoconf is currently using without
inspecting the undocumented internals of autoconf, so your code is very
fragile and likely to break if autoconf changes its implementation.
Writing your own test using AC_COMPILE_IFELSE is more robust, because it
sticks to documented interfaces.
- --
Don't work too hard, make some time for fun as well!
Eric Blake address@hidden
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