https://sourceware.org/bugzilla/show_bug.cgi?id=28871
--- Comment #3 from Fangrui Song <i at maskray dot me> ---
The semantics are different.
% ld.bfd -r --no-define-common a.o -o a.ro && readelf -Ws a.ro
ld.bfd: --no-define-common may not be used without -shared
% ld.bfd -shared --no-define-common a.o -o a.so && readelf -Ws a.so
Symbol table '.dynsym' contains 2 entries:
Num: Value Size Type Bind Vis Ndx Name
0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND
1: 0000000000000000 0 OBJECT GLOBAL DEFAULT UND x
Symbol table '.symtab' contains 3 entries:
Num: Value Size Type Bind Vis Ndx Name
0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND
1: 0000000000002f40 0 OBJECT LOCAL DEFAULT 7 _DYNAMIC
2: 0000000000000000 0 OBJECT GLOBAL DEFAULT UND x
See that x is undefined in GNU ld. In gold, --[no-]define-common controls
whether st_shndx is SHN_COMMON or not (allocated space or not).
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