[jdk11u-dev] RFR: 8348598: Update Libpng to 1.6.47

[Andrew John Hughes]

On Thu, 3 Apr 2025 07:10:38 GMT, Antonio Vieiro <duke at openjdk.org> wrote:

> Backport of [JDK-8348598](https://bugs.openjdk.org/browse/JDK-8348598) from JDK-17. 
> 
> Not clean as `make/lib/Awt2dLibraries.gmk` is different from JDK-17. Resolved adding the new `unused-function`  to `gcc`and `gclang` disabled warnings for AWT libraries.
> 
> Tier 1 tests pass. Tests for `javax.imageio` and `java2d/cmm` pass. `jfc_demo` is great to see! :-) .
> 
> 
> ==============================
> Test summary
> ==============================
>    TEST                                              TOTAL  PASS  FAIL ERROR   
>    jtreg:test/jdk/javax/imageio                        197   197     0     0   
> ==============================
> TEST SUCCESS
> 
> 
> ==============================
> Test summary
> ==============================
>    TEST                                              TOTAL  PASS  FAIL ERROR   
>    jtreg:test/jdk/sun/java2d/cmm                        19    19     0     0   
> ==============================
> TEST SUCCESS
> 
> ==============================
> Test summary
> ==============================
>    TEST                                              TOTAL  PASS  FAIL ERROR   
>    jtreg:test/jdk:jfc_demo                               1     1     0     0   
> ==============================
> TEST SUCCESS

This adds -Wno-unused-function to both gcc & clang, while the 17u version only adds it to clang. However, it looks like it is already present for gcc in 17u thanks to [JDK-8211029](https://bugs.openjdk.org/browse/JDK-8211029) so this seems ok.

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Marked as reviewed by andrew (Reviewer).

PR Review: https://git.openjdk.org/jdk11u-dev/pull/3021#pullrequestreview-2826300889