The Swift language uses a linker script when building binaries.
Unfortunately gold cannot parse it. ld.bfd is fine:

markus@x4 x86_64 % cat swift.ld
SECTIONS
{
  .swift2_protocol_conformances :
  {
    .swift2_protocol_conformances_start = . ;
    QUAD(SIZEOF(.swift2_protocol_conformances) - 8) ;
    *(.swift2_protocol_conformances) ;
  }
}
INSERT AFTER .dtors

markus@x4 x86_64 % ld.bfd -T swift.ld
ld.bfd: no input files

markus@x4 x86_64 % ld.gold -T swift.ld
ld.gold: error: swift.ld:10:8: syntax error, unexpected STRING
ld.gold: fatal error: unable to parse script file swift.ld