From: Tom de Vries <tdevries@suse.de>
Date: Mon, 20 Feb 2023 11:20:14 +0000 (+0100)
Subject: [gdb/symtab] Trust epilogue unwind info for unknown or non-gcc producer
X-Git-Tag: binutils-2_41~1686
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=868014341a7befe77468a87ef9d9da109cbf3c3c;p=thirdparty%2Fbinutils-gdb.git

[gdb/symtab] Trust epilogue unwind info for unknown or non-gcc producer

Currently we only trust epilogue unwind info only for gcc >= 4.5.0.

This has the effect that we don't trust epilogue unwind info for:
- unknown producers (CU without DW_AT_producer attribute)
- non-gcc producers (say, clang).

Instead, only distrust epilogue unwind info only for gcc < 4.5.0.
---

diff --git a/gdb/dwarf2/read.c b/gdb/dwarf2/read.c
index 11a2d3e7c9a..a5bc1d89a2d 100644
--- a/gdb/dwarf2/read.c
+++ b/gdb/dwarf2/read.c
@@ -6460,7 +6460,13 @@ process_full_comp_unit (dwarf2_cu *cu, enum language pretend_language)
       if (cu->has_loclist && gcc_4_minor >= 5)
 	cust->set_locations_valid (true);
 
-      if (gcc_4_minor >= 5)
+      int major, minor;
+      if (cu->producer != nullptr
+	  && producer_is_gcc (cu->producer, &major, &minor)
+	  && (major < 4 || (major == 4 && minor < 5)))
+	/* Don't trust gcc < 4.5.x.  */
+	cust->set_epilogue_unwind_valid (false);
+      else
 	cust->set_epilogue_unwind_valid (true);
 
       cust->set_call_site_htab (cu->call_site_htab);