This is the list of names "reserved to the implementation" that have been claimed by certain compilers of interest, and should not be used in the library. It will grow, of course. We generally are interested in names that are not all-caps, except for those like "_T" For Solarix: _B _C _L _N _P _S _U _X _E1 .. _E24 Irix adds: _A _G MS adds: _T For egcs: The full set of __* identifiers (combined from gcc/cp/lex.c and gcc/cplus-dem.c) that are either old or new, but are definitely recognized by the demangler, is: __aa __aad __ad __addr __adv __aer __als __alshift __amd __ami __aml __amu __aor __apl __array __ars __arshift __as __bit_and __bit_ior __bit_not __bit_xor __call __cl __cm __cn __co __component __compound __cond __convert __delete __dl __dv __eq __er __ge __gt __indirect __le __ls __lt __max __md __method_call __mi __min __minus __ml __mm __mn __mult __mx __ne __negate __new __nop __nt __nw __oo __op __or __pl __plus __postdecrement __postincrement __pp __pt __rf __rm __rs __sz __trunc_div __trunc_mod __truth_andif __truth_not __truth_orif __vc __vd __vn SGI badnames: __builtin_alloca __builtin_fsqrt __builtin_sqrt __builtin_fabs __builtin_dabs __builtin_cast_f2i __builtin_cast_i2f __builtin_cast_d2ll __builtin_cast_ll2d __builtin_copy_dhi2i __builtin_copy_i2dhi __builtin_copy_dlo2i __builtin_copy_i2dlo __add_and_fetch __sub_and_fetch __or_and_fetch __xor_and_fetch __and_and_fetch __nand_and_fetch __mpy_and_fetch __min_and_fetch __max_and_fetch __fetch_and_add __fetch_and_sub __fetch_and_or __fetch_and_xor __fetch_and_and __fetch_and_nand __fetch_and_mpy __fetch_and_min __fetch_and_max __lock_test_and_set __lock_release __lock_acquire __compare_and_swap __synchronize __high_multiply __unix __sgi __linux__ __i386__ __i486__ __cplusplus __embedded_cplusplus // long double conversion members mangled as __opr // http://sourceware.cygnus.com/ml/libstdc++/1999-q4/msg00060.html _opr