[OpenJDK 2D-Dev] jdk-hs ppc64le build error, probably related to libpng update

[Philip Race]

This all sounds fine to me.
Definitely we should report this upstream to see what they say but
clearly we aren't bound to wait for an answer from there since this is
a build breakage for PPC. If someone upstream
comes back with a better answer we can update the fix.

I think this png update will get backported to 8u at some point ..
the PPC port is supported on 8u, isn't it ? So we'll want to make
sure we have the fix before we do the backport.

-phil.

On 12/28/17, 5:07 AM, Baesken, Matthias wrote:
>
> Hi Phil,  I think your idea to guard with
>
> #ifdef PNG_POWERPC_VSX_API_SUPPORTED
>
> Is fine, should I prepare a webrev   using this guard ?
>
>   * Wrapping in that check might be OK (for
>     PNG_POWERPC_VSX_API_SUPPORTED) but you'll want to report this
>     upstream.
>
> Yes it is a good idea to report this upstream as well  at libpng.
>
> Best regards, Matthias
>
> *From:*Phil Race [mailto:philip.race at oracle.com]
> *Sent:* Freitag, 22. Dezember 2017 19:08
> *To:* Baesken, Matthias <matthias.baesken at sap.com>; 
> 2d-dev at openjdk.java.net
> *Cc:* Doerr, Martin <martin.doerr at sap.com>; Simonis, Volker 
> <volker.simonis at sap.com>
> *Subject:* Re: jdk-hs ppc64le build error, probably related to libpng 
> update
>
> I expect that will fix it but I wonder if the problem is that all of 
> this needs
> to be guarded by checking :-
>
> #ifdef PNG_POWERPC_VSX_API_SUPPORTED
>
> It looks to me configure would have set that if it had been run on PPC AND
> you have passed --enable-powerpc-vsx to configure
>
> But of course I did not.
>
> And someone can set it unsupported anyway.
>
> So this seems like a libpng bug.
>
> Wrapping in that check might be OK (for PNG_POWERPC_VSX_API_SUPPORTED) but
> you'll want to report this upstream.
>
> I have no intention of pulling in the accelerated code .. even for 
> intel ... this
> library is used only for splashscreen.
>
> -phil.
>
>
> On 12/21/2017 07:13 AM, Baesken, Matthias wrote:
>
>     >Do  you  have  a version of libpng  available that  contains  the
>     missing function  png_init_filter_functions_vsx  ?
>
>     >Or do you have an idea where it should come from (I cannot find it
>     in the main libpng sources).
>
>     >To fix the build, we could probably disable  the part  bringing in
>     png_init_filter_functions_vsx   in png_init_filter_functions_vsx  .
>
>     Hello, small update -  here is a fix that  disables the  libpng 
>     vsx optimizations  on ppc64  (and fixes the build issue).
>
>     Should I prepare a webrev ?  Or how to get  a ppc64 le  / be   
>     png_init_filter_functions_vsx   implementation ?
>
>     Best regards, Matthias
>
>     -----------------------
>
>     diff -r d55bee3727de
>     src/java.desktop/share/native/libsplashscreen/libpng/pngpriv.h
>
>     ---
>     a/src/java.desktop/share/native/libsplashscreen/libpng/pngpriv.h    Tue
>     Dec 19 17:31:53 2017 -0500
>
>     +++
>     b/src/java.desktop/share/native/libsplashscreen/libpng/pngpriv.h
>     Wed Dec 20 17:16:01 2017 +0100
>
>     @@ -220,12 +220,15 @@
>
>     #  endif
>
>     #endif
>
>     +/* for now avoid the ppc64 vsx optimizations */
>
>     #ifndef PNG_POWERPC_VSX_OPT
>
>     -#  if defined(__PPC64__) && defined(__ALTIVEC__) && defined(__VSX__)
>
>     -#     define PNG_POWERPC_VSX_OPT 2
>
>     -#  else
>
>     +/*
>
>     + * #  if defined(__PPC64__) && defined(__ALTIVEC__) &&
>     defined(__VSX__)
>
>     + * #     define PNG_POWERPC_VSX_OPT 2
>
>     + * #  else
>
>     + */
>
>     #     define PNG_POWERPC_VSX_OPT 0
>
>     -#  endif
>
>     +/* #  endif */
>
>     #endif
>
>      #ifndef PNG_INTEL_SSE_OPT
>
>     -----------------------
>
>     *From:*Baesken, Matthias
>     *Sent:* Mittwoch, 20. Dezember 2017 13:04
>     *To:* Phil Race (philip.race at oracle.com
>     <mailto:philip.race at oracle.com>) <philip.race at oracle.com>
>     <mailto:philip.race at oracle.com>
>     *Cc:* Doerr, Martin <martin.doerr at sap.com>
>     <mailto:martin.doerr at sap.com>; Simonis, Volker
>     <volker.simonis at sap.com> <mailto:volker.simonis at sap.com>;
>     2d-dev at openjdk.java.net <mailto:2d-dev at openjdk.java.net>
>     *Subject:* jdk-hs ppc64le build error, probably related to libpng
>     update
>
>     Hi Phil, it looks like  the recent  png lib change
>
>     8183960: Upgrade to libpng 1.6.34
>
>     http://hg.openjdk.java.net/jdk/hs/rev/791d551bcdb8
>
>     +#if PNG_POWERPC_VSX_OPT > 0
>
>     +#  define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_vsx
>
>     +#  define PNG_POWERPC_VSX_IMPLEMENTATION 1
>
>     +#endif
>
>     Causes  build errors  in  our  linuxppc64le   openjdk  jdk-hs
>     (fast)dbg  build .
>
>     We get  this linker error :
>
>     pngrutil.c:(.text+0x4824): undefined reference to
>     `png_init_filter_functions_vsx'
>
>     Do  you  have  a version of libpng  available that  contains  the
>     missing function  png_init_filter_functions_vsx  ?
>
>     Or do you have an idea where it should come from (I cannot find it
>     in the main libpng sources).
>
>     To fix the build, we could probably disable  the part  bringing in
>     png_init_filter_functions_vsx   in png_init_filter_functions_vsx  .
>
>     Thanks, Matthias
>
>     Error message :
>
>       * /hs/support/native/java.desktop/libsplashscreen/pngrutil.o: In
>         function `png_read_filter_row':
>       * pngrutil.c:(.text+0x4824): undefined reference to
>         `png_init_filter_functions_vsx'
>       * collect2: error: ld returned 1 exit status
>       * Awt2dLibraries.gmk:928: recipe for target
>         '/hs/support/modules_libs/java.desktop/libsplashscreen.so' failed
>
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