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From: Keith Thompson <kst-u@mib.org>
Newsgroups: comp.lang.c
Subject: Re: const and the C type system
Date: Mon, 02 Oct 2017 12:37:33 -0700
Organization: None to speak of
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Ian Collins <ian-news@hotmail.com> writes:
> On 10/ 3/17 07:33 AM, bartc wrote:
>> On 02/10/2017 17:40, Keith Thompson wrote:
>>> bartc <bc@freeuk.com> writes:
>>
>>>> If I specify this lot, it still says nothing about it
>>>> (I've no idea what those format warnings are about):
>>
>>>> c:\c>\tdm\bin\gcc -O3 -std=c11 -Wall -Wextra -Wpedantic -c c.c
>>>>
>>>> c.c: In function 'main':
>>>> c.c:14:10: warning: unknown conversion type character 'l' in format
>>>>               [-Wformat=]
>>>>       printf("d=%lld\n",d);
>>>>              ^
>>>> c.c:14:10: warning: too many arguments for format [-Wformat-extra-args]
>>
>>> That's weird.  What version of gcc are you using ("gcc --version")?
>>>
>>> gcc 6.3.0 doesn't complain about the format strings.  An very
>>> old version of gcc might not recognize the "%lld" format, which
>>> was introduced in C99, but then it shouldn't have recognized the
>>> "-std=c11" option.
>>
>> It was version 5.1.0 (tdm for Windows).
>>
>> It can be reduced to this:
>>
>>       printf("%lld",0LL);
>>
>> then 'gcc -Wall -c' says 'unknown conversion type character 'l' in format'.
>
> Could this be a consequence of a windows library not supporting %lld?

Ah, that's a possibility, though it would be an indirect consequence.
tdm-gcc <http://tdm-gcc.tdragon.net/> is based on MinGW-w64 with
some local patches.  Either the tdm developers or the MinGW-w64
developers might have modified gcc to force it *not* to recognize
"%lld".  (If the library actually does support "%lld", then this
is a bug but not a conformance issue.)

-- 
Keith Thompson (The_Other_Keith) kst-u@mib.org  <http://www.ghoti.net/~kst>
Working, but not speaking, for JetHead Development, Inc.
"We must do something.  This is something.  Therefore, we must do this."
    -- Antony Jay and Jonathan Lynn, "Yes Minister"