[llvm] [llvm][CMake] Fix llvm shared library when using ninja multi config (PR #65451)

[via llvm-commits]

https://github.com/ur4t updated https://github.com/llvm/llvm-project/pull/65451:

>From 5c20a2768b641d128a8a9ed696a86501c2e4c3a9 Mon Sep 17 00:00:00 2001
From: ur4t <46435411+ur4t at users.noreply.github.com>
Date: Thu, 17 Aug 2023 23:21:39 +0800
Subject: [PATCH] [llvm][CMake] Fix llvm shared library when using ninja multi
 config

---
 llvm/tools/llvm-shlib/CMakeLists.txt | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/llvm/tools/llvm-shlib/CMakeLists.txt b/llvm/tools/llvm-shlib/CMakeLists.txt
index 4f6a2cbfbba308e..0d01d8e880e1fcf 100644
--- a/llvm/tools/llvm-shlib/CMakeLists.txt
+++ b/llvm/tools/llvm-shlib/CMakeLists.txt
@@ -41,9 +41,22 @@ if(LLVM_BUILD_LLVM_DYLIB)
      OR ("${CMAKE_SYSTEM_NAME}" STREQUAL "DragonFly")
      OR ("${CMAKE_SYSTEM_NAME}" STREQUAL "Android")
      OR ("${CMAKE_SYSTEM_NAME}" STREQUAL "SunOS")) # FIXME: It should be "GNU ld for elf"
-    configure_file(
-    ${CMAKE_CURRENT_SOURCE_DIR}/simple_version_script.map.in
-    ${LLVM_LIBRARY_DIR}/tools/llvm-shlib/simple_version_script.map)
+
+    if(NOT "${CMAKE_CFG_INTDIR}" STREQUAL ".")
+      foreach(BUILD_MODE ${CMAKE_CONFIGURATION_TYPES})
+        # Replace the special string with a per config directory.
+        string(REPLACE ${CMAKE_CFG_INTDIR} ${BUILD_MODE} PER_CONF_LIBRARY_DIR ${LLVM_LIBRARY_DIR})
+        configure_file(
+          ${CMAKE_CURRENT_SOURCE_DIR}/simple_version_script.map.in
+          ${PER_CONF_LIBRARY_DIR}/tools/llvm-shlib/simple_version_script.map
+        )
+      endforeach()
+    else()
+      configure_file(
+        ${CMAKE_CURRENT_SOURCE_DIR}/simple_version_script.map.in
+        ${LLVM_LIBRARY_DIR}/tools/llvm-shlib/simple_version_script.map
+      )
+    endif()
 
     # GNU ld doesn't resolve symbols in the version script.
     set(LIB_NAMES -Wl,--whole-archive ${LIB_NAMES} -Wl,--no-whole-archive)