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Re: What is "ac_nonexistent.h"?

From: NightStrike
Subject: Re: What is "ac_nonexistent.h"?
Date: Wed, 9 Mar 2011 15:32:58 -0500

On Mon, Mar 7, 2011 at 2:10 PM, Ralf Wildenhues <address@hidden> wrote:
> Hello, and sorry for any name mangling,
> * Eric Blake wrote on Mon, Mar 07, 2011 at 03:44:59PM CET:
>> On 03/07/2011 04:42 AM, СоУВУВ wrote:
>> > "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.
> Maybe AC_*_IFELSE should allow to denote the expected outcome, in
> order to put only the unexpected outcome verbosely in config.log.

That would be a very welcome change

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