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Re: preventing defines in config.h
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From: |
Eric Blake |
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Subject: |
Re: preventing defines in config.h |
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Date: |
Thu, 19 Oct 2006 18:54:10 -0600 |
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Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.7) Gecko/20060909 Thunderbird/1.5.0.7 Mnenhy/0.7.4.666 |
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According to Andy Howell on 10/19/2006 2:22 AM:
> Hello,
Hi,
>
> I'm tying to understand how defines get added to config.h.
Definition templates are output into the config.h template by autoheader,
then configure decides which templates to enable vs. disable.
> In my
> configure.ac file I have:
>
> if test "apple" = "orange"; then
> AC_DEFINE_UNQUOTED(HAVE_SOMETHING,1,[Define if SOMETHING])
> fi
>
> My test fails, so I don't expect to get
>
> /* Define is SOMETHING */
> #define HAVE_SOMETHING 1
>
> in config.h
That is a correct assumption - if the AC_DEFINE_UNQUOTED is never
executed, the config.h portion will remain undefined.
>
> I did a sh -x on configure, but I never see it do HAVE_SOMETHING.
If the code is never executed, that is to be expected. Or maybe I'm
misunderstanding the real question you are trying to ask.
- --
Life is short - so eat dessert first!
Eric Blake address@hidden
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