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Re: "localename" functions suggest pure/const attribute

From: Pádraig Brady
Subject: Re: "localename" functions suggest pure/const attribute
Date: Thu, 10 Jul 2014 18:58:07 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130110 Thunderbird/17.0.2

On 07/10/2014 06:16 PM, Assaf Gordon wrote:
> On 07/10/2014 12:20 PM, Pádraig Brady wrote:
>> On 07/10/2014 01:39 AM, Assaf Gordon wrote:
>>> make  all-recursive
>>> make[1]: Entering directory 
>>> `/home/gordon/projects/gnulib/testdir30793/build'
>>> Making all in gllib
>>> make[2]: Entering directory 
>>> `/home/gordon/projects/gnulib/testdir30793/build/gllib'
>>> make  all-recursive
>>> make[3]: Entering directory 
>>> `/home/gordon/projects/gnulib/testdir30793/build/gllib'
>>> make[4]: Entering directory 
>>> `/home/gordon/projects/gnulib/testdir30793/build/gllib'
>>> depbase=`echo localename.o | sed 's|[^/]*$|.deps/&|;s|\.o$||'`;\
>>>      gcc -Wall -DHAVE_CONFIG_H -I. -I../../gllib -I..  
>>> -DGNULIB_STRICT_CHECKING=1   -O1 -g -Werror -Wsuggest-attribute=const 
>>> -Wsuggest-attribute=pure -MT localename.o -MD -MP -MF $depbase.Tpo -c -o 
>>> localename.o ../../gllib/localename.c &&\
>>>      mv -f $depbase.Tpo $depbase.Po
>>> ../../gllib/localename.c: In function ‘string_hash’:
>>> ../../gllib/localename.c:2519:1: error: function might be candidate for 
>>> attribute ‘pure’ if it is known to return normally 
>>> [-Werror=suggest-attribute=pure]
>>>   string_hash (const void *x)
>>>   ^
>>> cc1: all warnings being treated as errors
>> Rather than worry about warnings like test for gnulib tests,
>> coreutils configure.ac ignores those using:
>>    # For gnulib-tests, the set is slightly smaller still.
>>    nw=
>>    nw="$nw -Wstrict-prototypes"
>>    # It's not worth being this picky about test programs.
>>    nw="$nw -Wsuggest-attribute=const"
>>    nw="$nw -Wsuggest-attribute=pure"
>>                           [$GNULIB_WARN_CFLAGS], [$nw])
>> I wonder why it's reproducible by default with coreutils for you?
>> Note if modifying CFLAGS, it's usually better to specify AM_CFLAGS
>> rather than impacting on generated CFLAGS.
> If I understand correctly, the coreutil section you've listed disables these 
> warnings for Gnulib's *tests*.
> But the warning is from a gnulib module (not its tests).
> Under 'coreutils' gnulib modules are still compiled with 
> "-Wsuggest-attribute=const -Wsuggest-attribute=pure".
> This hasn't been triggered before because coreutils hans't used "localename" 
> module (but I needed it for the seq+letters patch).
> Thanks,
>  - gordon

Oh I see now. That was more apparent from your initial patch:
(which I didn't get due to recent GNU mailing list issues).

I'll apply that.


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