bug#63257: Android port: unable to build using javac 20.0.1 on Arch Linux

[Simon Pugnet]

I have been building the Android port from source regularly and after 
a recent Arch Linux package update I am no longer able to configure 
the build.

The JDK package I currently have installed is: extra/jdk-openjdk 
20.0.1.u9-3

When running configure I get: -

 [...]
 checking whether the Java compiler works... no
 configure: error: The Java compiler does not work, or you did not 
 specify
 a valid path to android.jar.  See config.log for more details.
 make: *** [Makefile:586: config.status] Error 1

Checking config.log shows: -

 [...]
 configure:7603: checking whether the Java compiler works
 warning: [options] bootstrap class path not set in conjunction with 
 -source 7
 error: Source option 7 is no longer supported. Use 8 or later.
 error: Target option 7 is no longer supported. Use 8 or later.
 configure:7634: result: no
 configure:7638: error: The Java compiler does not work, or you did 
 not specify
 a valid path to android.jar.  See config.log for more details.
 [...]

When I run javac I see the following: -

 [...]
 --source <release>, -source <release>
       Provide source compatibility with the specified Java SE 
       release. Supported releases: 8, 9, 10, 11, 12, 13, 14, 15, 16, 
       17, 18, 19, 20
 [...]
 --target <release>, -target <release>
       Generate class files suitable for the specified Java SE 
       release. Supported releases: 8, 9, 10, 11, 12, 13, 14, 15, 16, 
       17, 18, 19, 20
 [...]

I can see a few lines in configure.ac which are like this: -

 ("$JAVAC" -classpath "$with_android" -target 1.7 -source 1.7 
 conftest.java \

So I'm assuming the error comes from this version of javac not 
supporting -target/-source 1.7.

I hope that provides enough information, please let me know if you'd 
like me to test anything else.

Kind regards,

--
Simon Pugnet
https://www.polaris64.net/
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