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Re: Can configure figure out if a C library supports a feature?
From: |
Eli Zaretskii |
Subject: |
Re: Can configure figure out if a C library supports a feature? |
Date: |
Fri, 14 May 2010 12:35:20 +0300 |
> From: address@hidden
> Date: Fri, 14 May 2010 10:57:15 +0200
>
> Can configure figure out if a C library supports a feature?
>
> I have refreshed the ImageMagick branch, and want to support more
> versions of ImageMagick.
>
> At some point ImageMagick introduced MagickExportImagePixels(). I can
> optionaly take advantage of this function. How do I figure out and
> handle in my code that this function is available?
You link with the appropriate library to see whether the link
succeeds.
> Im looking for something like having autoconf emitting a #define
> HAVE_MAGICKEXPORTIMAGEPIXELS.
Check out AC_CHECK_FUNC and AC_CHECK_FUNCS macros in Autoconf. You
can see how they are used in configure.in.