native-compile the problematic file after setting the variable
'comp-libgccjit-reproducer' to a non-nil value. That should produce a
file named ELNFILENAME_libgccjit_repro.c, where ELNFILENAME is the
-name of the problematic .eln file, in the same directory where the
-.eln file is produced. Then attach that reproducer C file to your bug
-report.
+name of the problematic .eln file in the same directory where the .eln
+file is produced, or a file repro.c under your ~/.emacs.d/eln-cache
+(which one depends on how the native-compilation is invoked). Then
+attach that reproducer C file to your bug report.
** Following longjmp call.