build warnings

Jonathan Gibbons jonathan.gibbons at
Wed Dec 3 16:21:46 UTC 2014

On 12/03/2014 03:09 AM, Magnus Ihse Bursie wrote:
> On 2014-12-02 22:59, Jonathan Gibbons wrote:
>> Build folk,
>> The build has always generated warnings (sigh!) but right now, the 
>> warnings look scarier than usual.
>> In particular, when the build terminates, I get a couple of 
>> screenfuls of messages like this:
>> /w/jjg/work/jfm2.0/dev.8059977.sjfm/jdk/src/java.desktop/unix/native/libsplashscreen/splashscreen_sys.c: 
>> In function ‘SplashScreenThread’:
>> /w/jjg/work/jfm2.0/dev.8059977.sjfm/jdk/src/java.desktop/unix/native/libsplashscreen/splashscreen_sys.c:742:9: 
>> warning: ignoring return value of ‘pipe’, declared with attribute 
>> warn_unused_result [-Wunused-result]
>>      pipe(splash->controlpipe);
>>          ^
>> /w/jjg/work/jfm2.0/dev.8059977.sjfm/jdk/src/java.desktop/share/native/libsplashscreen/splashscreen_gfx_impl.c: 
>> In function ‘initFormat’:
>> /w/jjg/work/jfm2.0/dev.8059977.sjfm/jdk/src/java.desktop/share/native/libsplashscreen/splashscreen_gfx_impl.c:305:34: 
>> warning: ‘numBits’ may be used uninitialized in this function 
>> [-Wmaybe-uninitialized]
>>          format->shift[i] = shift + numBits - i * 8 - 8;
>>                                   ^
>> What would it take to have some sort of campaign to reduce build 
>> warnings like these?  We've made good progress on lint and doclint 
>> warnings for Java code and doc comments; what does it take to start 
>> on native code warnings?
> Actually, I've already started on such a campain. ;-)
> I believe the way to go is:
> 1) disable all (or more or less all) of the current flood of warnings
> 2) open bugs for all disabled warnings on the corresponding 
> components, indicating that the owner of the component should:
> a) fix the issue with the source code and re-enable the warning, or
> b) come up with a good reason why the warning is bad/broken and should 
> be left disabled for that component.
> I have started on 1). I have a local forest which disables most of the 
> warnings for linux builds. I'm about to move on to the other platforms 
> as well, but other work came between.
> /Magnus


Thank you for the update; it's great to hear this is being looked at.

-- Jon

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