On Mon, Jun 4, 2012 at 3:53 PM, Steven Bosscher <stevenb....@gmail.com> wrote:
> What I don't understand, is whether this is still something GNAT has > to support, or whether this code can be deprecated/removed. And I ask > for your help because you are one of the people who worked on this > so-many-years ago > (http://gcc.gnu.org/ml/gcc-patches/2004-12/msg00550.html) and because > you obviously have much better understanding of GNAT and of how this > kind of low-level thing works in GCC than I do. > > If this should continue to be supported: > For the corresponding option for G++ (-fconserve-space) the > documentation says that the flag isn't very useful anymore because: > "This option is no longer useful on most targets, now that support has > been added for putting variables into BSS without making them common." > What I don't understand, is what this means for GNAT. (Remember, I > help build aircraft for a living, not compilers! I can barely > distinguish .bss from .data, and don't understand at all where/how GCC > decides to put variables in one section or another :-D) I was hoping > maybe you know how to rewrite that piece of code such that you get > that uninitialized variable into BSS without DECL_COMMON. > > Or maybe you can tell if this code is no longer needed, so I can > prepare a patch to remove it. Is this feature necessary for non-ELF file formats, such as AIX XCOFF? - David
