GDAL uses SWIG to generate its Java bindings, and there are two parts outputs from this: gdal.jar, and the native libgdalalljni.so that the JAR references. The ebuild installs gdal.jar but not the .so, and trying to run a Java project that uses GDAL results in: Native library load failed. java.lang.UnsatisfiedLinkError: no gdalalljni in java.library.path: [/usr/java/packages/lib, /usr/lib64, /lib64, /lib, /usr/lib] I think this is a simple oversight. These files exist in the work directory: # (cd /var/tmp/portage/sci-libs/gdal-3.0.4-r1 && ls -l $(find -iname '*gdalalljni*')) -rw-r--r-- 1 portage portage 1693 Nov 2 15:21 ./work/gdal-3.0.4/swig/java/libgdalalljni.la -rwxr-xr-x 1 portage portage 686328 Nov 2 15:21 ./work/gdal-3.0.4/swig/java/libgdalalljni.so lrwxrwxrwx 1 portage portage 19 Nov 2 15:21 ./work/gdal-3.0.4/swig/java/.libs/libgdalalljni.la -> ../libgdalalljni.la -rw-r--r-- 1 portage portage 1188 Nov 2 15:21 ./work/gdal-3.0.4/swig/java/.libs/libgdalalljni.lai lrwxrwxrwx 1 portage portage 23 Nov 2 15:21 ./work/gdal-3.0.4/swig/java/.libs/libgdalalljni.so -> libgdalalljni.so.26.0.4 lrwxrwxrwx 1 portage portage 23 Nov 2 15:21 ./work/gdal-3.0.4/swig/java/.libs/libgdalalljni.so.26 -> libgdalalljni.so.26.0.4 -rwxr-xr-x 1 portage portage 686328 Nov 2 15:21 ./work/gdal-3.0.4/swig/java/.libs/libgdalalljni.so.26.0.4 I can confirm that adding dolib.so "${S}"/swig/java/.libs/libgdalalljni.so{,.26,.26.0.4} into the "use java" conditional in src_install fixes the problem and lets Java load gdal.jar successfully. (The .../java/libgdalalljni.so file is just a copy of the .so in .libs, this can be seen in the build log.)
Created attachment 669809 [details] emerge --info
Also, a heads up that if GDAL is built with USE=-threads and used from Java, it issues this warning: WARNING: GDAL should be compiled with thread support for safe execution in Java. Rebuilding with USE=threads fixes it. I'm not sure if this warrants a REQUIRED_USE entry or if this should be left as a soft warning. There's an FAQ item relating to GDAL thread-safety: https://trac.osgeo.org/gdal/wiki/FAQMiscellaneous#IstheGDALlibrarythread-safe
