bearophile Wrote: > > > ../../gcc/d/d-gcc-real.h: In member function ‘const real_value& > > > real_t::rv() const’: > > > ../../gcc/d/d-gcc-real.h:54: warning: dereferencing type-punned pointer > > > will > > break strict-aliasing rules > > > > If you have a great idea to fix this warning, please send a patch. > > In GCC there is a switch that disables strict aliasing optimization. I think > if you use it the compiler gets a bit slower, but you will also avoid bugs > caused by this optimization, and maybe the warnings too. Otherwise there are > other ways to solve it, maybe using an union to perform the pointer cast.
I'm sure that after so many years (30+) of professional experience with C/C++/D/Java compilers, Walter knows much much better than you or GCC when this optimization can be done in unsafe manner. It's an error in the compiler heuristics. > > We don't use that function for anything at the moment. Though I think the > > idea may > > have been to make GCC builtins known to the Frontend parser. > > That's just an example. There are tens of other cases of unused variables > spread here and there. They're not really unused. The GDC team probably made the mistakes. > I have done some tests on the 32 bit gdc D2, compiled today on Ubuntu. Some > comments: > > The compilation and the compiler works! This is great considering that it's a > card castle about 2 lighyears high that uses no glue. Yes, it's amazing they managed to make it work. Worth a few beers. > Using the latest LDC 1, the stripped binary of a little raytracer-like > program that mostly uses the C standard library is about 174_960 bytes, > similar code compiled with GDC2 is 458_052 bytes stripped, and over 2 MB > unstripped, this is not good. This must be an error in your test. You see, D is very suitable for kernel development. The executable for the N queens problem or a raytracer is actually smaller than 2 kB. How otherwise you program a kernel for an embedded platform with 16 kB of ROM? "458_052 bytes stripped, and over 2 MB unstripped" is this loser talk Walter is talking about.
