From c5c5046bbf55b188adefd2db5af13af56276bfc0 Mon Sep 17 00:00:00 2001
From: Julien Schueller <schueller@phimeca.com>
Date: Wed, 23 Aug 2023 20:47:55 +0200
Subject: [PATCH] CMake: support LLVM as a single shared library

---
 CMakeLists.txt | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index d51da30de2..9545f67832 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -157,7 +157,17 @@ if (WITH_LLVM)
         add_definitions("-DHAVE_TARGET_X86=1")
     endif()
 
-    llvm_map_components_to_libnames(llvm_libs ${LPYTHON_LLVM_COMPONENTS})
+    if (TARGET LLVMCore)
+        # If `LLVMCore` target is present, then LLVM is distributed as separate
+        # libraries and llvm_map_components_to_libnames() should work:
+        llvm_map_components_to_libnames(llvm_libs ${LPYTHON_LLVM_COMPONENTS})
+    else()
+        # Workaround for https://github.com/llvm/llvm-project/issues/34593
+        # If LLVM is distributed as a single library (the LLVMCore target is
+        # missing), we set `llvm_libs` to "LLVM" which links against the single
+        # `libLLVM.so` shared library.
+        set(llvm_libs "LLVM")
+    endif()
     unset(LPYTHON_LLVM_COMPONENTS)
 
     add_library(p::llvm INTERFACE IMPORTED)