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Re: What is "ac_nonexistent.h"?
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From: |
Eric Blake |
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Subject: |
Re: What is "ac_nonexistent.h"? |
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Date: |
Mon, 07 Mar 2011 07:44:59 -0700 |
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User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.13) Gecko/20101209 Fedora/3.1.7-0.35.b3pre.fc14 Lightning/1.0b3pre Mnenhy/0.8.3 Thunderbird/3.1.7 |
On 03/07/2011 04:42 AM, ?????? wrote:
> Hi, guys.
> I'm new to Autoconf.
> Recently I wrote an very, very simple example of using autotools. The example
> worked OK(all worked OK, including generated Makefiles). But when I added
> macro AC_CHECK_HEADERS([...]) and it went well to generate configure shell
> script.
> So I ran ./configure, it's OK! Still I checked config.log, and found there is
> an error showing:
> "error: ac_nonexistent.h, no such file or directory."
> ...
> "Compilation terminated."
> Fortunately that is the only error which appeared several times in the
> config.log file.
That's a _good_ thing. We _expect_ that compilation error, to prove
that we are correctly detecting how your compiler detects and rejects
broken source code that refers to a non-existent header (knowing how the
compiler detects missing headers is essential for later tests of
AC_CHECK_HEADERS to see which headers are present).
Not all failed compilations are bugs.
--
Eric Blake address@hidden +1-801-349-2682
Libvirt virtualization library http://libvirt.org
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