diff --git a/0001-cmake-Add-LLVM_UNITTEST_LINK_FLAGS-option.patch b/0001-cmake-Add-LLVM_UNITTEST_LINK_FLAGS-option.patch
new file mode 100644
index 0000000..192ca92
--- /dev/null
+++ b/0001-cmake-Add-LLVM_UNITTEST_LINK_FLAGS-option.patch
@@ -0,0 +1,39 @@
+From cf35b4622d31701d0c79e0441931518726f997f2 Mon Sep 17 00:00:00 2001
+From: Nikita Popov <npopov@redhat.com>
+Date: Fri, 30 Jun 2023 12:25:09 +0200
+Subject: [PATCH] Add LLVM_UNITTEST_LINK_FLAGS option
+
+This allows specifying linker flags that should only be applied
+to unit tests, e.g. to disable LTO optimization for them.
+---
+ llvm/cmake/modules/AddLLVM.cmake           | 2 ++
+ llvm/cmake/modules/HandleLLVMOptions.cmake | 3 +++
+ 2 files changed, 5 insertions(+)
+
+diff --git a/llvm/cmake/modules/AddLLVM.cmake b/llvm/cmake/modules/AddLLVM.cmake
+index 94fc83db9344..7cf75223ce38 100644
+--- a/llvm/cmake/modules/AddLLVM.cmake
++++ b/llvm/cmake/modules/AddLLVM.cmake
+@@ -1592,6 +1592,8 @@ function(add_unittest test_suite test_name)
+     endif()
+   endif()
+ 
++  target_link_options(${test_name} PRIVATE "${LLVM_UNITTEST_LINK_FLAGS}")
++
+   set(outdir ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR})
+   set_output_directory(${test_name} BINARY_DIR ${outdir} LIBRARY_DIR ${outdir})
+   # libpthreads overrides some standard library symbols, so main
+diff --git a/llvm/cmake/modules/HandleLLVMOptions.cmake b/llvm/cmake/modules/HandleLLVMOptions.cmake
+index 6119ecdce0f4..eec98162c2d7 100644
+--- a/llvm/cmake/modules/HandleLLVMOptions.cmake
++++ b/llvm/cmake/modules/HandleLLVMOptions.cmake
+@@ -1274,3 +1274,6 @@ endif()
+ 
+ set(LLVM_THIRD_PARTY_DIR  ${CMAKE_CURRENT_SOURCE_DIR}/../third-party CACHE STRING
+     "Directory containing third party software used by LLVM (e.g. googletest)")
++
++set(LLVM_UNITTEST_LINK_FLAGS "" CACHE STRING
++    "Additional linker flags for unit tests")
+-- 
+2.40.1
+
diff --git a/llvm.spec b/llvm.spec
index c8001fc..0c52b70 100644
--- a/llvm.spec
+++ b/llvm.spec
@@ -94,6 +94,9 @@ Source6:	release-keys.asc
 Patch1:		0001-SystemZ-Improve-error-messages-for-unsupported-reloc.patch
 # See https://reviews.llvm.org/D137890 for the next two patches
 Patch2:		0001-llvm-Add-install-targets-for-gtest.patch
+# Backport of https://reviews.llvm.org/D154212 from LLVM 17.
+Patch3: 0001-cmake-Add-LLVM_UNITTEST_LINK_FLAGS-option.patch
+
 # RHEL-specific patch to avoid unwanted recommonmark dep
 Patch101:	0101-Deactivate-markdown-doc.patch
 # Patching third-party dir with a 200 offset in patch number
@@ -323,7 +326,8 @@ export ASMFLAGS=$CFLAGS
 	-DCMAKE_INSTALL_PREFIX=%{install_prefix} \
 	-DLLVM_INSTALL_SPHINX_HTML_DIR=%{_pkgdocdir}/html \
 	-DSPHINX_EXECUTABLE=%{_bindir}/sphinx-build-3 \
-	-DLLVM_INCLUDE_BENCHMARKS=OFF
+	-DLLVM_INCLUDE_BENCHMARKS=OFF \
+	-DLLVM_UNITTEST_LINK_FLAGS="-Wl,-plugin-opt=O0"
 
 # Build libLLVM.so first.  This ensures that when libLLVM.so is linking, there
 # are no other compile jobs running.  This will help reduce OOM errors on the