> On Tue, 19 Jan 2016, Jan Hubicka wrote: > > > Hi, > > here is updated patch. It has same effect as the former version. > > > > Bootstrapped/regtested x86_64-linux, OK? > > But what about the comment? > > We track no > information on whether given type is used or not, so we have > to keep them even when not emitting debug information, > otherwise we may end up remapping variables and their (local) > types in different orders depending on whether debug > information is being generated. */ > > which suggests that the TYPE_DECLs somehow "order" remapping > of local types and that is somehow important (maybe for VLA > types which refer to locals). OTOH local vars are also > duplicated in order before copying stmts (which may introduce > differences because of seeing debug stmts or not refering to > decls/types).
The original patch is here: https://gcc.gnu.org/ml/gcc-patches/2011-01/msg01344.html my understand is that it is all about DECL_UID being stable with -g0 and -g. My patch does not change that becuase I drop ignored and redundant typedefs even with -g. Honza
