[Bug debug/78265] Excess emission of debug info for ODR used global variables

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78265

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2016-11-09
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.  We are indeed erring more and more on the side of emit-debug-info
for whatever is referenced in the source.

In this case debug info for 'i' is requested via

#0  dwarf2out_early_global_decl (decl=<var_decl 0x2aaaaaad7b40 i>)
    at /space/rguenther/src/gcc-git/gcc/dwarf2out.c:25232
#1  0x0000000000ffa9e5 in rest_of_decl_compilation (
    decl=<var_decl 0x2aaaaaad7b40 i>, top_level=1, at_end=0)
    at /space/rguenther/src/gcc-git/gcc/passes.c:320
#2  0x00000000007ee13e in make_rtl_for_nonlocal_decl (
    decl=<var_decl 0x2aaaaaad7b40 i>, init=<tree 0x0>, asmspec=0x0)
    at /space/rguenther/src/gcc-git/gcc/cp/decl.c:6433
#3  0x00000000007f0d73 in cp_finish_decl (decl=<var_decl 0x2aaaaaad7b40 i>, 
    init=<tree 0x0>, init_const_expr_p=false, asmspec_tree=<tree 0x0>, flags=1)
    at /space/rguenther/src/gcc-git/gcc/cp/decl.c:7067

and we never prune debug info for decls (only for "unused" types).  OTOH I'm
not
a strong believer in first generating something and later pruning it again.

Same happens with the C frontend.