Darryl Miles <darryl-mailinglists@xxxxxxxxxxxx> writes: > How do I do this with GCC 4 ? This works with GCC3 on i386, but not > on GCC4 on x86_64. Any advise on what #ifdef to put in place or if > there is one way that works with both GCC versions ? > > From the output of GCC test.c => test.s > > #APP > > pushfl > popl %eax > > #NO_APP > > Yeilds errors on GCC4 x86_64: > > test.s:2287: Error: suffix or operands invalid for `pushf' > test.s:2288: Error: suffix or operands invalid for `pop' Those errors are coming from the assembler. This is an assembler issue, not a gcc issue. This one happens to be simple: the x86_64 does not have a pushfl instruction. Read the fine manual. The x86_64 does have a pushfq instruction. Ian
