https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90901
--- Comment #3 from Rajpal Singh <rajpal.gusain at gmail dot com> --- I did try with g++ 9.1.0 and I still see similar/same issue. % g++ --version g++ (GCC) 9.1.0 % readelf -w <myfile.o> .... readelf: Error: Unknown macro opcode 52 seen readelf: Error: Unknown macro opcode 12 seen readelf: Error: Unknown macro opcode 19 seen readelf: Error: Unknown macro opcode 11 seen readelf: Error: Unknown macro opcode 11 seen readelf: Error: Unknown macro opcode 22 seen readelf: Error: Unknown macro opcode 35 seen readelf: Error: Unknown macro opcode 2d seen readelf: Error: Unknown macro opcode 49 seen readelf: Error: Unknown macro opcode 97 seen readelf: Error: Unknown macro opcode 3d seen readelf: Error: Unknown macro opcode 13 seen readelf: Error: Unknown macro opcode 3b seen ....
