pdp11 assembler generate the opcode of CLC on SEC command: > cat test.asm sec clc > pdp11-aout-as -al test.asm GAS LISTING test.asm page 1 1 0000 A100 sec 2 0002 A100 clc
Likely fix can be found at http://sourceware.org/ml/binutils/2006-03/msg00369.html
Bug reported to be fixed be upstream changes.