On Sun Feb 16 2014 at 6:39:32 AM, Howard Hinnant <[email protected]> wrote:
> On Feb 16, 2014, at 2:13 AM, Richard Smith <[email protected]> wrote: > > > This seems to be going in the wrong direction. > > > > * max_align_t needs to be in <stddef.h> as well as in <cstddef> > > * <stddef.h> is provided by the compiler, not by the standard library > > * max_align_t is de facto part of the platform's ABI. It's not enough to > get the alignment right, you also need to get the size and mangled name of > the type right (and possibly other things too). > > > > IMO, the right thing to do here is to add a definition to max_align_t to > Clang's lib/Headers/stddef.h, and add a using declaration to libc++'s > cstddef to pull it into namespace std. > > > > On Feb 9, 2014, at 2:50 PM, Howard Hinnant <[email protected]> > wrote: > > > Features: > > > > 1. If <__config> defines _LIBCPP_C_HAS_MAX_ALIGN_T, then max_align_t is > grabbed from the global namespace / <stddef.h>. Currently no platform in > <__config> defines _LIBCPP_C_HAS_MAX_ALIGN_T. C11 introduces max_align_t > in <stddef.h>. I expect that eventually all platforms will migrate to this > option. > Sorry, I missed that part =) That general approach sounds right to me.
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