[PATCH] debug/92763 keep DIEs that might be used in DW_TAG_inlined_subroutine

[Richard Biener]

We were pruning type-local subroutine DIEs if their context is unused
despite us later needing those DIEs as abstract origins for inlines.
The patch makes code already present for -fvar-tracking-assignments
unconditional.

Bootstrapped and tested on x86_64-unknown-linux-gnu, OK?

Thanks,
Richard.

2020-01-20  Richard Biener  <rguent...@suse.de>

        PR debug/92763
        * dwarf2out.c (prune_unused_types): Unconditionally mark
        called function DIEs.

        * g++.dg/debug/pr92763.C: New testcase.

diff --git a/gcc/dwarf2out.c b/gcc/dwarf2out.c
index 70b3fad13a2..fe46c7e1eee 100644
--- a/gcc/dwarf2out.c
+++ b/gcc/dwarf2out.c
@@ -29529,9 +29529,9 @@ prune_unused_types (void)
   for (i = 0; base_types.iterate (i, &base_type); i++)
     prune_unused_types_mark (base_type, 1);
 
-  /* For -fvar-tracking-assignments, also set the mark on nodes that could be
-     referenced by DW_TAG_call_site DW_AT_call_origin (i.e. direct call
-     callees).  */
+  /* Also set the mark on nodes that could be referenced by
+     DW_TAG_call_site DW_AT_call_origin (i.e. direct call callees) or
+     by DW_TAG_inlined_subroutine origins.  */
   cgraph_node *cnode;
   FOR_EACH_FUNCTION (cnode)
     if (cnode->referred_to_p (false))
@@ -29540,8 +29540,7 @@ prune_unused_types (void)
        if (die == NULL || die->die_mark)
          continue;
        for (cgraph_edge *e = cnode->callers; e; e = e->next_caller)
-         if (e->caller != cnode
-             && opt_for_fn (e->caller->decl, flag_var_tracking_assignments))
+         if (e->caller != cnode)
            {
              prune_unused_types_mark (die, 1);
              break;
diff --git a/gcc/testsuite/g++.dg/debug/pr92763.C 
b/gcc/testsuite/g++.dg/debug/pr92763.C
new file mode 100644
index 00000000000..8e32d60039f
--- /dev/null
+++ b/gcc/testsuite/g++.dg/debug/pr92763.C
@@ -0,0 +1,19 @@
+// { dg-do compile }
+// { dg-additional-options "-fno-var-tracking-assignments -fopenmp" }
+
+struct A
+{
+  typedef int T;
+  #pragma omp declare reduction (y : T : [&omp_out, &omp_in]() { omp_out += 
omp_in; return 0; }()) initializer (omp_priv = [omp_orig]() { return omp_orig; 
}())
+  static void foo ();
+};
+
+void
+A::foo ()
+{
+  int r = 0, s = 0;
+  #pragma omp parallel for reduction (y : r, s)
+  for (int i = 0; i < 1; i++)
+    {
+    }
+}