diff --git a/SOURCES/0001-clang-Enforce-instantiation-of-constexpr-template-fu.patch b/SOURCES/0001-clang-Enforce-instantiation-of-constexpr-template-fu.patch
new file mode 100644
index 0000000..3819da9
--- /dev/null
+++ b/SOURCES/0001-clang-Enforce-instantiation-of-constexpr-template-fu.patch
@@ -0,0 +1,90 @@
+From c081bf4098c729afacf20303cc9df62bf13c3362 Mon Sep 17 00:00:00 2001
+From: serge-sans-paille <sguelton@redhat.com>
+Date: Sat, 18 Jun 2022 13:48:41 +0200
+Subject: [PATCH] [clang] Enforce instantiation of constexpr template functions
+ during non-constexpr evaluation
+
+Otherwise these functions are not instantiated and we end up with an undefined
+symbol.
+
+Fix #55560
+
+Differential Revision: https://reviews.llvm.org/D128119
+---
+ clang/lib/Sema/SemaTemplateInstantiateDecl.cpp  |  5 +++--
+ .../CodeGenCXX/constexpr-late-instantiation.cpp | 17 +++++++++++++++++
+ .../SemaCXX/constexpr-late-instantiation.cpp    | 15 +++++++++++++++
+ 3 files changed, 35 insertions(+), 2 deletions(-)
+ create mode 100644 clang/test/CodeGenCXX/constexpr-late-instantiation.cpp
+ create mode 100644 clang/test/SemaCXX/constexpr-late-instantiation.cpp
+
+diff --git a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
+index 467372c71496..293782822e83 100644
+--- a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
++++ b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
+@@ -4826,7 +4826,8 @@ void Sema::InstantiateFunctionDefinition(SourceLocation PointOfInstantiation,
+                                      /*Complain*/DefinitionRequired)) {
+     if (DefinitionRequired)
+       Function->setInvalidDecl();
+-    else if (TSK == TSK_ExplicitInstantiationDefinition) {
++    else if (TSK == TSK_ExplicitInstantiationDefinition ||
++             (Function->isConstexpr() && !Recursive)) {
+       // Try again at the end of the translation unit (at which point a
+       // definition will be required).
+       assert(!Recursive);
+@@ -4841,7 +4842,7 @@ void Sema::InstantiateFunctionDefinition(SourceLocation PointOfInstantiation,
+         Diag(PatternDecl->getLocation(), diag::note_forward_template_decl);
+         if (getLangOpts().CPlusPlus11)
+           Diag(PointOfInstantiation, diag::note_inst_declaration_hint)
+-            << Function;
++              << Function;
+       }
+     }
+ 
+diff --git a/clang/test/CodeGenCXX/constexpr-late-instantiation.cpp b/clang/test/CodeGenCXX/constexpr-late-instantiation.cpp
+new file mode 100644
+index 000000000000..1c8eef73f2dd
+--- /dev/null
++++ b/clang/test/CodeGenCXX/constexpr-late-instantiation.cpp
+@@ -0,0 +1,17 @@
++// Make sure foo is instantiated and we don't get a link error
++// RUN: %clang_cc1 -S -emit-llvm -triple %itanium_abi_triple %s -o- | FileCheck %s
++
++template <typename T>
++constexpr T foo(T a);
++
++// CHECK-LABEL: define {{.*}} @main
++int main() {
++  // CHECK: call {{.*}} @_Z3fooIiET_S0_
++  int k = foo<int>(5);
++}
++// CHECK: }
++
++template <typename T>
++constexpr T foo(T a) {
++  return a;
++}
+diff --git a/clang/test/SemaCXX/constexpr-late-instantiation.cpp b/clang/test/SemaCXX/constexpr-late-instantiation.cpp
+new file mode 100644
+index 000000000000..ec8e071217c1
+--- /dev/null
++++ b/clang/test/SemaCXX/constexpr-late-instantiation.cpp
+@@ -0,0 +1,15 @@
++// RUN: %clang_cc1 %s -fsyntax-only -verify
++
++template <typename T>
++constexpr T foo(T a);   // expected-note {{declared here}}
++
++int main() {
++  int k = foo<int>(5);  // Ok
++  constexpr int j =     // expected-error {{constexpr variable 'j' must be initialized by a constant expression}}
++          foo<int>(5);  // expected-note {{undefined function 'foo<int>' cannot be used in a constant expression}}
++}
++
++template <typename T>
++constexpr T foo(T a) {
++  return a;
++}
+-- 
+2.38.1
+
diff --git a/SPECS/clang.spec b/SPECS/clang.spec
index 17b43d8..093e20e 100644
--- a/SPECS/clang.spec
+++ b/SPECS/clang.spec
@@ -45,7 +45,7 @@
 
 Name:		%pkg_name
 Version:	%{clang_version}%{?rc_ver:~rc%{rc_ver}}
-Release:	1%{?dist}
+Release:	4%{?dist}
 Summary:	A C language family front-end for LLVM
 
 License:	NCSA
@@ -75,6 +75,7 @@ Patch4:     0001-cmake-Allow-shared-libraries-to-customize-the-soname.patch
 Patch5:     0001-Work-around-gcc-miscompile.patch
 Patch7:     0010-PATCH-clang-Produce-DWARF4-by-default.patch
 Patch8:     disable-recommonmark.patch
+Patch9:     0001-clang-Enforce-instantiation-of-constexpr-template-fu.patch
 
 # Patches for clang-tools-extra
 # See https://reviews.llvm.org/D120301
@@ -374,6 +375,7 @@ mv ../clang-%{compat_ver}.src ../clang
 	-DCLANG_INCLUDE_TESTS:BOOL=ON \
 	-DLLVM_EXTERNAL_CLANG_TOOLS_EXTRA_SOURCE_DIR=../%{clang_tools_srcdir} \
 	-DLLVM_EXTERNAL_LIT=%{_bindir}/lit \
+	-DLLVM_LIT_ARGS="-vv" \
 	-DLLVM_MAIN_SRC_DIR=%{_datadir}/llvm/src \
 %if 0%{?__isa_bits} == 64
 	-DLLVM_LIBDIR_SUFFIX=64 \
@@ -649,6 +651,16 @@ false
 
 %endif
 %changelog
+* Tue Dec 13 2022 Konrad Kleine <kkleine@redat.com> - 14.0.6-4
+- Bump release version
+
+* Fri Dec 09 2022 Timm Bäder <tbaeder@redhat.com> - 14.0.6-3
+- Print executed tests
+
+* Tue Dec 06 2022 Timm Bäder <tbaeder@redhat.com> - 14.0.6-2
+- Fix upstream bug llvm#55560
+- https://bugzilla.redhat.com/show_bug.cgi?id=2150854
+
 * Tue Jul 19 2022 Timm Bäder <tbaeder@redhat.com> - 14.0.6-1
 - Update to 14.0.6