[gcc r17-2311] [PATCH] gm2, sel-sched-ir: Remove Unused Declarations from GCC.

https://gcc.gnu.org/g:600145403597f5b4dcc422eb28a2f1c21e8cca7e

commit r17-2311-g600145403597f5b4dcc422eb28a2f1c21e8cca7e
Author: Léo Hardt <[email protected]>
Date:   Fri Jul 10 08:17:37 2026 -0600

    [PATCH] gm2,sel-sched-ir: Remove Unused Declarations from GCC.
    
    Good evening,
    
    The two declarations mentioned below are not used.
    This patch removes them from the code.
    
     * current_succs was introduced in e855c69, and
       it is not used since then. Perhaps a previous
       working version of the code used it and was
       refactored away. One may note that there is
       only one commit for 'git log -S current_succs',
       and that it was featured on Jan's "Unused Vars"
       e-mail from the year after it was added:
    
       https://gcc.gnu.org/legacy-ml/gcc/2010-05/msg00688.html
    
       If I might speculate, the comment suggests it was
       supposed to hold the value of compute_succs_info,
       but in the productive code, the value is simply
       returned.
    
     * ggc_force_collect is an old variable, which
       was made into a parameter of ggc_collect in
       0edf2e81. An 'extern' declaration for it was
       later added in 1eee94d, when merging the gm2
       front-end into this repository.
    
    Bootstrapped successfully on my machine.
    
    gcc/m2/ChangeLog:
    
            * plugin/m2rte.cc: Removed unused extern bool
            ggc_force_collect.
    
    gcc/ChangeLog:
    
            * sel-sched-ir.cc (struct succs_info): Removed
            unused variable current_succs.

Diff:
---
 gcc/m2/plugin/m2rte.cc | 1 -
 gcc/sel-sched-ir.cc    | 3 ---
 2 files changed, 4 deletions(-)

diff --git a/gcc/m2/plugin/m2rte.cc b/gcc/m2/plugin/m2rte.cc
index 96659b9ae0c7..c003487182df 100644
--- a/gcc/m2/plugin/m2rte.cc
+++ b/gcc/m2/plugin/m2rte.cc
@@ -41,7 +41,6 @@ along with GNU Modula-2; see the file COPYING3.  If not see
 #include "context.h"
 
 #include "rtegraph.h"
-extern bool ggc_force_collect;
 extern void ggc_collect (void);
 
 #undef DEBUG_BASICBLOCK
diff --git a/gcc/sel-sched-ir.cc b/gcc/sel-sched-ir.cc
index 48651a81bba7..75713501b654 100644
--- a/gcc/sel-sched-ir.cc
+++ b/gcc/sel-sched-ir.cc
@@ -53,9 +53,6 @@ vec<sel_region_bb_info_def> sel_region_bb_info;
 /* A pool for allocating all lists.  */
 object_allocator<_list_node> sched_lists_pool ("sel-sched-lists");
 
-/* This contains information about successors for compute_av_set.  */
-struct succs_info current_succs;
-
 /* Data structure to describe interaction with the generic scheduler utils.  */
 static struct common_sched_info_def sel_common_sched_info;