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

[Erik Joelsson]

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/

/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