https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81135
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2017-06-20
CC| |aldyh at gcc dot gnu.org,
| |jason at gcc dot gnu.org,
| |rguenth at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. Note that technically for
extern int j;
extern int i;
extern int bar (int);
extern int foo (int);
int main () { return foo (1) + i; }
we are still missing debuginfo for 'foo'. If the module containing the
implementation was not built with -g then debugging experience in this
module is worse than necessary.
Note that 'foo' _is_ used here still neither GCC 5 nor GCC 6 create a DIE
for 'foo' but both generate one for 'i'. GCC 6 now generates a DIE for 'j'
where GCC 5 didn't. No compiler generates a DIE for 'bar'.
Same for GCC 7 + trunk.
I think we should have a mode where we generate debuginfo for all of the
extern declarations, used or not, and we should have a way to prune
unused extern decl DIEs. Which means we should emit a DIE for 'foo' in
all cases (which will bloat info). Otherwise why emit one for 'i'
(maybe have a mode to drop all extern DIEs which may be refered to via
the symtab).
