Advice on how to do DISABLED_WARNINGS in jdk8u-dev

[Ali Ince]

Hi All,

I'm trying to get jdk8u to be built with VS2017.

This requires disabling several warnings for several libraries (as been 
done in later versions of the openjdk, like [1]) however jdk8u doesn't 
have the DISABLED_WARNINGS_$(TOOLCHAIN_TYPE) [2] argument support in 
SetupNativeCompilation target [3]. I have investigated the possibility 
of back-porting JDK-8074096, which first introduced DISABLED_WARNINGS 
into jdk9 but that seemed not very feasible.

I've already progressed with adding -Wd flags to CFLAGS_windows 
overrides in corresponding places but not sure if this would be the 
right approach to do this.

I will be grateful if someone could advise me on what approach I should 
proceed?

Best regards,

Ali

[1] 
http://hg.openjdk.java.net/jdk-updates/jdk11u/file/640251cdca05/make/lib/Awt2dLibraries.gmk#l519
[2] 
http://hg.openjdk.java.net/jdk-updates/jdk11u/file/640251cdca05/make/common/NativeCompilation.gmk#l381
[3] 
http://hg.openjdk.java.net/jdk8u/jdk8u-dev/file/f0f617923ceb/make/common/NativeCompilation.gmk#l135