seen with 4.4 and 4.5 (attachment in PR42698), when the file fiven with -fsource-filename doesn't exist.
$ gcj-4.4 -c -fsource-filename=/tmp/fileTkf0Hh -g -O2 -fPIC -findirect-dispatch -fjni ./debian/ant-gcj/usr/lib/gcj/ant-1.7.1.jar.3.jar -o ant-1.7.1.jar.3.o jc1: internal compiler error: in java_read_sourcefilenames, at java/jcf-parse.c:192 Please submit a full bug report, with preprocessed source if appropriate. -- Summary: jc1: ICE in java_read_sourcefilenames, at java/jcf- parse.c:192 Product: gcc Version: 4.5.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: java AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: doko at ubuntu dot com http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42700