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Re: Howto: run the C preprocessor and capture its output
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From: |
Eric Blake |
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Subject: |
Re: Howto: run the C preprocessor and capture its output |
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Date: |
Fri, 19 Oct 2007 16:33:38 +0000 (UTC) |
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User-agent: |
Loom/3.14 (http://gmane.org/) |
According to Zack Weinberg on 10/19/2007 8:45 AM:
>
> Really? As far as I can tell, that just lets me make a binary
> decision based on the presence or absence of some pattern; the text
> matching the pattern still gets bitbucketed.
You can use AC_RUN_IFELSE to covert preprocessor macros into text. Or, if
you are computing a number and worried about cross-compilations, you can
use up to 32 invocations of AC_EGREP_CPP to build a 32-bit number using
binary decisions. In fact, that's what AC_COMPUTE_INT does.
So maybe AC_COMPUTE_INT is what you want.
--
Eric Blake