RFR: 8074844 : Resolve disabled warnings for libfontmanager

[Sergey Bylokhov]

Hi, Phil.

Probably we could enable WARNINGS_AS_ERRORS_xlc as well? I guess we will need a confirmation from the SAP gurus.

On 27.08.2020 12:39, Philip Race wrote:
> Bug : https://bugs.openjdk.java.net/browse/JDK-8074844
> Webrev : http://cr.openjdk.java.net/~prr/8074844/index.html
> 
> This resolves the disabled compiler warnings in what is now quite a small fontmanager library.
> 
> I've built windows, mac and linux in our build system and run our full battery of automated tests and sanity checked manual.
> 
> A quick run down of how the warnings map to the changes
> 
>        DISABLED_WARNINGS_clang := sign-compare,
> 
>        DISABLED_WARNINGS_gcc := sign-compare unused-function int-to-pointer-cast,
> 
> Sign compare in both of the above are the reason for the majority of the changes in freetypeScaler.c
> and also the change in hb-jdk.h
> 
> 
> unused-function was _free_nothing in
> src/java.desktop/share/native/libfontmanager/hb-jdk-font.cc
> 
> 
> int-to-pointer-cast was an issue for 32 bit as raised here https://bugs.openjdk.java.net/browse/JDK-8250605
> when a previous removal broke 32 bit Linux. Since we don't build or test that I was flying in the dark here
> using the warnings from that bug. The changes for this are those in
> 
> src/java.desktop/share/native/libfontmanager/DrawGlyphList.c
> src/java.desktop/unix/native/libfontmanager/X11FontScaler.c
> 
> 
>        DISABLED_WARNINGS_microsoft := 4018 4146 4244 4996,
> 
> The unique windows warnings were
> ./open/src/java.desktop/share/native/libfontmanager/HBShaper.c(216): error C2220: the following warning is treated as an error
>   ./open/src/java.desktop/share/native/libfontmanager/HBShaper.c(216): warning C4244: '=': conversion from 'jlong' to 'long', possible loss of data
> 
>   ./open/src/java.desktop/share/native/libfontmanager/freetypeScaler.c(1216): error C2220: the following warning is treated as an error
>   ./open/src/java.desktop/share/native/libfontmanager/freetypeScaler.c(1216): warning C4146: unary minus operator applied to unsigned type, result still unsigned
> 
> ./open/src/java.desktop/windows/native/libfontmanager/lcdglyph.c(128): error C2220: the following warning is treated as an error
> [ ./open/src/java.desktop/windows/native/libfontmanager/lcdglyph.c(128): warning C4996: 'GetVersion': was declared deprecated
> 
> GetVersion isn't needed any more since we aren't likely to be running on anything older than XP !
> 
> -phil.
> 
> 
> 
> 


-- 
Best regards, Sergey.