https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65536
--- Comment #24 from Jan Hubicka <hubicka at gcc dot gnu.org> --- Manuel, you may be right person to implement the streaming of linemaps then :) I suppose we do care about inline stacks in longer term to get proper warnings. We even may want to preserve macro expansion and all other info we have at compile time. In addition to that we ought to be able to tell what compilation unit the line infromation originate from https://gcc.gnu.org/ml/gcc-patches/2014-07/msg01876.html because same location in different units may have (and often has) different context. Not for GCC 5 though. I will still experiment with the idea of adding locations to linemaps only once tree merging found the tree location new. On average we read every tree about 20 times for Firefox, so this ought to reduce the waste of linemap space quite considerably perhaps pushing it to non-issue for GCC 5. honza
