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Compilers often emit relative paths in the line number program, relative to the build directory for that compilation unit (if it's DWARF>=4 I think). Therefore use symtab->fullname() when not null as this seemingly has attempted path normalization for the symtab and only fall back on symtab->filename which will never be null if that fails. This has a much better UX. Applications may choose to expose this name as a clickable link to some file, at which point a non-normalized and non-absolute path would lead nowhere. When I wrote this feature the first time, I don't think this relative-to-cu-scheme was as prevalent in the output of gcc/clang for DWARF. Approved-By: Tom Tromey <tom@tromey.com>