RFR: JDK-8148629: Disable remaining warnings in awt/fontmanager

[Magnus Ihse Bursie]

On 2016-02-05 10:41, Erik Joelsson wrote:
> Magnus pointed out that I mistakenly replaced fno-strict-aliasing with 
> -Wno-strict-aliasing. Reverted that change.
>
> http://cr.openjdk.java.net/~erikj/8148629/webrev.jdk.02/
The new webrev looks good to me.

However, the use of -w for individual files is a bit scary. :-( It's not 
easy to grep for (like "WARNINGS_AS_ERRORS") and it's quite broad. 
Please make sure you update JDK-8079958 and JDK-8079955 with clear 
instructions on what have been disabled for these libraries, and how to 
fix this, so this does not get lost.

I believe this is the last instance where we had warnings in native 
compilation printed during every build, so when this is pushed I think 
it's time for a small celebration. :-)

/Magnus

>
> /Erik
>
> On 2016-02-05 10:05, Erik Joelsson wrote:
>> A while back, Magnus did a tremendous job of disabling most warnings 
>> in the JDK native libraries and enabling warnings as errors on most 
>> of them. However, some libraries, typically awt related, proved to be 
>> harder.
>>
>> One of the reasons was that some toolchains had different warning 
>> labels specified for C vs C++ and would not accept the other kind 
>> without printing new warning. For libraries containing both C and C++ 
>> source files, this prevented us from disabling all warnings. This 
>> limitation in SetupNativeCompilation has since been fixed so I could 
>> use that functionality to disable most remaining warnings.
>>
>> Another reason is that some source files contain warnings that are 
>> deemed severe enough by the compiler that they can't be individually 
>> ignored. Since the team owning that source seem unwilling to fix 
>> these warnings anyway, I have simply disabled all warnings on those 
>> specific files, for the specific toolchains where it applies. I have 
>> tried to add descriptive comments explaining each such occurrence.
>>
>> I have tested this by building a full hotspot job and an openjdk only 
>> job in JPRT. It is possible that people building with other toolchain 
>> versions than Oracle will start seeing new build failures because of 
>> more warnings in these libraries. In that case, either 
>> --disable-warnings-as-errors, submit fixes for the warnings, or add 
>> more warning ignores.
>>
>> Bug: https://bugs.openjdk.java.net/browse/JDK-8148629
>> Webrev: http://cr.openjdk.java.net/~erikj/8148629/webrev.jdk.01/
>>
>> /Erik
>