From 8e6ddc931a6d6eef8ad88a526cf8688b49d46211 Mon Sep 17 00:00:00 2001
From: ptaylor <paul.e.taylor@me.com>
Date: Fri, 2 Jul 2021 22:55:42 -0500
Subject: [PATCH] always add faiss library alias if it's missing

---
 cpp/cmake/thirdparty/get_faiss.cmake | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/cpp/cmake/thirdparty/get_faiss.cmake b/cpp/cmake/thirdparty/get_faiss.cmake
index 4991990e379..a65401579cb 100644
--- a/cpp/cmake/thirdparty/get_faiss.cmake
+++ b/cpp/cmake/thirdparty/get_faiss.cmake
@@ -40,7 +40,10 @@ function(find_and_configure_faiss)
 
     if(FAISS_ADDED)
       set(FAISS_GPU_HEADERS ${FAISS_SOURCE_DIR} PARENT_SCOPE)
-      add_library(FAISS::FAISS ALIAS faiss)
+    endif()
+
+    if(TARGET faiss AND NOT TARGET FAISS::FAISS)
+        add_library(FAISS::FAISS ALIAS faiss)
     endif()
 
 endfunction()