On 18/06/13 18:32, Ian Lance Taylor wrote: > On Tue, Jun 18, 2013 at 7:35 AM, David Brown <david@xxxxxxxxxxxxxxx> wrote: >> >> I did not think that was the case. As I understood it, "-g" /may/ cause >> to the code to improve debugging. I can't say that I have ever noticed >> any code changes, but I've always assumed it is possible especially with >> more advanced optimisations. >> >> I certainly don't see anything in the documentation that suggests "-g" >> cannot change the code - only that "-g -O" will generate optimised and >> debugable code (though possibly with confusing debugging). > > That turns out not to be the case. It always been a strict rule with > GCC that -g does not affect code generation. > > What the OP is describing is a serious bug. > > Ian > Thanks for that information. I think it is a useful feature that enabling debugging does not affect the generated code, but I didn't realise gcc was strict about it. David
