[Bug lto/96385] New: GCC generates separate debug info with undefined symbols without relocations

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96385

            Bug ID: 96385
           Summary: GCC generates separate debug info with undefined
                    symbols without relocations
           Product: gcc
           Version: 10.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hjl.tools at gmail dot com
                CC: marxin at gcc dot gnu.org
  Target Milestone: ---

Created attachment 48956
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48956&action=edit
LTO debug output

GCC may generate separate debug info files which contain undefined symbols
without relocations.  Here is the lto output from binutils LTO build:

[hjl@gnu-cfl-2 binutils-cross-run]$ readelf -rsW /tmp/gcc.lto.debug.o | grep
lreal
    96: 0000000000000000     0 NOTYPE  GLOBAL DEFAULT  UND lrealpath
[hjl@gnu-cfl-2 binutils-cross-run]$ 

It triggered a linker bug:

https://sourceware.org/bugzilla/show_bug.cgi?id=26314