Remove java cross-comp options, include debuginfo #144
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When compiling Java part with JDK 11 (or later), the current javac options `-source 1.8` and `-tatget 1.8` are ineffective. Resulting bytecode format is compatible with JDK 8, but cannot be run on JDk 8 because it is compiled against the bootstrap classpath of JDK 11 and depends on methods not available in JDK 8. This change removes these cross-compilation flags. It is assumed, that official release binaries are always built with JDK 8. For users/packagers, who is going to build the driver from source, a CMake configure-time warning about JDK 8 compatibility is added. Additionally Java debuginfo is added to the JAR (`-g` flag). It does not affect the performance and the JAR size increase is minor (less than 10KB). Fixes: duckdb#143
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When compiling Java part with JDK 11 (or later), the current javac options
-source 1.8and-tatget 1.8are ineffective. Resulting bytecode format is compatible with JDK 8, but cannot be run on JDK 8 because it is compiled against the bootstrap classpath of JDK 11 and depends on methods not available in JDK 8.This change removes these cross-compilation flags. It is assumed, that official release binaries are always built with JDK 8. For users/packagers, who is going to build the driver from source, a CMake configure-time warning about JDK 8 compatibility is added.
Additionally Java debuginfo is added to the JAR (
-gflag). It does not affect the performance and the JAR size increase is minor (less than 10KB).Fixes: #143