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