From 1ecd1e6c894fbdbc10fdcfee419922b24e1115ee Mon Sep 17 00:00:00 2001
From: Bernd Edlinger <bernd.edlinger@hotmail.de>
Date: Tue, 11 May 2021 17:55:18 +0200
Subject: [PATCH] Fix ICE in output_rnglists, at dwarf2out.c:12294

In this testcase the compile unit consists of a single
text section with a single embedded DECL_IGNORED_P function.
So we have a kind of multi-range text section here.
To avoid an ICE in output_rnglists we need to make sure
that have_multiple_function_sections is set to true.
This is a regression from
e69ac020372 ("Add line debug info for virtual thunks")

2021-05-12  Bernd Edlinger  <bernd.edlinger@hotmail.de>

	PR debug/100515
	* dwarf2out.c (dwarf2out_finish): Set
	have_multiple_function_sections with multi-range text_section.

	* gcc.dg/debug/dwarf2/pr100515.c: New testcase.
---
 gcc/dwarf2out.c                              |  1 +
 gcc/testsuite/gcc.dg/debug/dwarf2/pr100515.c | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+)
 create mode 100644 gcc/testsuite/gcc.dg/debug/dwarf2/pr100515.c

diff --git a/gcc/dwarf2out.c b/gcc/dwarf2out.c
index 8fc82989abc..b99598eb9f8 100644
--- a/gcc/dwarf2out.c
+++ b/gcc/dwarf2out.c
@@ -31956,6 +31956,7 @@ dwarf2out_finish (const char *filename)
             add_AT_addr (main_comp_unit_die, DW_AT_entry_pc, const0_rtx, true);
 
 	  add_ranges (NULL);
+	  have_multiple_function_sections = true;
 	}
     }
 
diff --git a/gcc/testsuite/gcc.dg/debug/dwarf2/pr100515.c b/gcc/testsuite/gcc.dg/debug/dwarf2/pr100515.c
new file mode 100644
index 00000000000..7c72fcd6693
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/debug/dwarf2/pr100515.c
@@ -0,0 +1,19 @@
+/* PR debug/100515 */
+/* { dg-do compile } */
+/* { dg-options "-g -O2 -fopenmp" } */
+
+void
+foo (int x)
+{
+#pragma omp taskloop
+  for (int i = 0; i < x; i++)
+    ;
+}
+
+void
+bar (int x)
+{
+#pragma omp taskloop
+  for (int i = 0; i < x; i++)
+    ;
+}