[Bug debug/86964] [7/8/9 Regression] Too many debug symbols included, especially for extern globals

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86964

--- Comment #9 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Mon Mar 25 21:19:09 2019
New Revision: 269925

URL: https://gcc.gnu.org/viewcvs?rev=269925&root=gcc&view=rev
Log:
        PR debug/86964
        * dwarf2out.c (premark_used_variables): New function.
        (prune_unused_types_walk): Do not mark not premarked external
        variables.
        (prune_unused_types): Call premark_used_variables.

        * gcc.dg/debug/dwarf2/pr86964.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/debug/dwarf2/pr86964.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/dwarf2out.c
    trunk/gcc/testsuite/ChangeLog