--strip-unneeded and --discard-all removed the section definition symbol of
a COMDAT section if no relocation referenced it directly, which is the
common case since relocations target the COMDAT leader. The aux record of
that symbol carries the COMDAT selection; without it lld discards the
section as a leaderless COMDAT and silently drops relocations against it.
This broke e.g. .refptr.* sections in MinGW objects, producing executables
that load garbage instead of the referenced pointer.
Assisted-by: Claude Opus 5.5
(cherry picked from commit cf40a83cb398897d21bb54c5a7a2eecb8d0633b3)
BtbN
1be9d5eb62