elfutils: Backport fix for DW_TAG_unspecified_type handling

diff --git a/meta/recipes-devtools/elfutils/elfutils_0.188.bb b/meta/recipes-devtools/elfutils/elfutils_0.188.bb
index 182229becf..74271b2411 100644
--- a/meta/recipes-devtools/elfutils/elfutils_0.188.bb
+++ b/meta/recipes-devtools/elfutils/elfutils_0.188.bb
@@ -23,6 +23,7 @@  SRC_URI = "https://sourceware.org/elfutils/ftp/${PV}/${BP}.tar.bz2 \
            file://0001-tests-Makefile.am-compile-test_nlist-with-standard-C.patch \
            file://0001-PR29926-debuginfod-Fix-usage-of-deprecated-CURLINFO_.patch \
            file://0002-debuginfod-client-Use-CURLOPT_PROTOCOLS_STR-for-libc.patch \
+           file://handle_DW_TAG_unspecified_type.patch \
            "
 SRC_URI:append:libc-musl = " \
            file://0003-musl-utils.patch \
@@ -98,8 +99,6 @@  do_install_ptest() {
 		cp -r ${B}/debuginfod                   ${D}${PTEST_PATH}
 		sed -i '/^Makefile:/c Makefile:'        ${D}${PTEST_PATH}/tests/Makefile
 		find ${D}${PTEST_PATH} -type f -name *.[hoc] | xargs -i rm {}
-		# TODO: remove below filter after https://sourceware.org/bugzilla/show_bug.cgi?id=30047 is fixed
-		sed -i -e '/funcretval/d' ${D}${PTEST_PATH}/tests/run-native-test.sh
 	fi
 }
 
diff --git a/meta/recipes-devtools/elfutils/files/handle_DW_TAG_unspecified_type.patch b/meta/recipes-devtools/elfutils/files/handle_DW_TAG_unspecified_type.patch
new file mode 100644
index 0000000000..8cab01c29a
--- /dev/null
+++ b/meta/recipes-devtools/elfutils/files/handle_DW_TAG_unspecified_type.patch
@@ -0,0 +1,88 @@ 
+From: Mark Wielaard <mark@klomp.org>
+Date: Thu, 26 Jan 2023 17:19:15 +0000 (+0100)
+Subject: backends: Handle DW_TAG_unspecified_type in dwarf_peeled_die_type
+X-Git-Url: https://sourceware.org/git/?p=elfutils.git;a=commitdiff_plain;h=f2c522567ad63ac293535fba9704895e685ab5bc;hp=3fa98a6f29b0f370e32549ead7eb897c839af980
+
+backends: Handle DW_TAG_unspecified_type in dwarf_peeled_die_type
+
+binutils 2.40 introduces DW_TAG_unspecified_type for assembly
+functions with an unknown return type. This breaks the
+run-funcretval.sh testcase because dwfl_module_return_value_location
+returns an error for such functions because it cannot determine the
+return value location. Fix that by treating DW_TAG_unspecified_type
+as if the DIE doesn't have a DW_AT_type.
+
+Also update the testcase to explicitly checking for
+DW_TAG_unspecified_type and printing "returns unspecified type".
+
+https://sourceware.org/bugzilla/show_bug.cgi?id=30047
+
+Upstream-Status: Backport [https://sourceware.org/git/?p=elfutils.git;a=commitdiff;h=f2c522567ad63ac293535fba9704895e685ab5bc;hp=3fa98a6f29b0f370e32549ead7eb897c839af980]
+Signed-off-by: Mark Wielaard <mark@klomp.org>
+---
+
+--- a/backends/libebl_CPU.h
++++ b/backends/libebl_CPU.h
+@@ -1,5 +1,6 @@
+ /* Common interface for libebl modules.
+    Copyright (C) 2000, 2001, 2002, 2003, 2005, 2013, 2014 Red Hat, Inc.
++   Copyright (C) 2023 Mark J. Wielaard <mark@klomp.org>
+    This file is part of elfutils.
+ 
+    This file is free software; you can redistribute it and/or modify
+@@ -53,7 +54,9 @@ extern bool (*generic_debugscn_p) (const
+      dwarf_tag (_die); })
+ 
+ /* Get a type die corresponding to DIE.  Peel CV qualifiers off
+-   it.  */
++   it.  Returns zero if the DIE doesn't have a type, or the type
++   is DW_TAG_unspecified_type.  Returns -1 on error.  Otherwise
++   returns the result tag DW_AT value.  */
+ static inline int
+ dwarf_peeled_die_type (Dwarf_Die *die, Dwarf_Die *result)
+ {
+@@ -69,7 +72,14 @@ dwarf_peeled_die_type (Dwarf_Die *die, D
+   if (dwarf_peel_type (result, result) != 0)
+     return -1;
+ 
+-  return DWARF_TAG_OR_RETURN (result);
++  if (result == NULL)
++    return -1;
++
++  int tag = dwarf_tag (result);
++  if (tag == DW_TAG_unspecified_type)
++    return 0; /* Treat an unspecified type as if there was no type.  */
++
++  return tag;
+ }
+ 
+ #endif	/* libebl_CPU.h */
+--- a/tests/funcretval.c
++++ b/tests/funcretval.c
+@@ -1,5 +1,6 @@
+ /* Test program for dwfl_module_return_value_location.
+    Copyright (C) 2005 Red Hat, Inc.
++   Copyright (C) 2023 Mark J. Wielaard <mark@klomp.org>
+    This file is part of elfutils.
+ 
+    This file is free software; you can redistribute it and/or modify
+@@ -67,7 +68,18 @@ handle_function (Dwarf_Die *funcdie, voi
+     error (EXIT_FAILURE, 0, "dwfl_module_return_value_location: %s",
+ 	   dwfl_errmsg (-1));
+   else if (nlocops == 0)
+-    puts ("returns no value");
++    {
++      // Check if this is the special unspecified type
++      // https://sourceware.org/bugzilla/show_bug.cgi?id=30047
++      Dwarf_Die die_mem, *typedie = &die_mem;
++      Dwarf_Attribute attr_mem, *attr;
++      attr = dwarf_attr_integrate (funcdie, DW_AT_type, &attr_mem);
++      if (dwarf_formref_die (attr, typedie) != NULL
++	  && dwarf_tag (typedie) == DW_TAG_unspecified_type)
++	puts ("returns unspecified type");
++      else
++	puts ("returns no value");
++    }
+   else
+     {
+       printf ("return value location:");