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From: Philipp Klaus Krause <pkk@spth.de>
Newsgroups: comp.os.linux.development.apps
Subject: =?UTF-8?Q?Re:_warning:_implicit_declaration_of_function_=e2=80=98mk?= =?UTF-8?B?c3RlbXDigJk=?=
Date: Thu, 3 Aug 2017 12:30:03 +0200
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Am 03.08.2017 um 12:08 schrieb Richard Kettlewell:
> Philipp Klaus Krause <pkk@spth.de> writes:
>> When using mkstemp() in my C source, I get the gcc warning:
>>
>> warning: implicit declaration of function ‘mkstemp’
>>
>> Why?
>> I use gcc 6.4.0 on a debian GNU/Linux system.
>> <stdlib.h> is included. I use other POSIX functions  (such as
>> ftruncate() and open()) that are not part of ISO C in the same source
>> file, but get a warning for mkstemp() only.
>> I tried using -D_POSIX_C_SOURCE=200112L, but still get the warning.
> 
> WFM on an up-to-date sid install. What’s your test case?
> 

Sorry for the noise. I just checked again, and I mistook the <stdio.h>
include for <stdlib.h> earlier. With the correct include, the warning is
gone.

Philipp