From ea0a85abaedb63545a1de82cabafbc1587f73ab1 Mon Sep 17 00:00:00 2001
From: Mason M <mason@bandoti.com>
Date: Thu, 23 Jan 2025 09:43:51 -0400
Subject: [PATCH] Guard against adding to cache variable twice

---
 ggml/CMakeLists.txt     |  5 ++---
 ggml/src/CMakeLists.txt | 10 +++++++---
 2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/ggml/CMakeLists.txt b/ggml/CMakeLists.txt
index a6aa97d9d..17abdfede 100644
--- a/ggml/CMakeLists.txt
+++ b/ggml/CMakeLists.txt
@@ -278,9 +278,8 @@ execute_process(COMMAND ${GIT_EXE} rev-list --count HEAD
     OUTPUT_STRIP_TRAILING_WHITESPACE
 )
 
-if(${GGML_BUILD_NUMBER} EQUAL 1)
-    message(WARNING
-        "GGML build version fixed at 1 likely due to a shallow clone.")
+if(GGML_BUILD_NUMBER EQUAL 1)
+    message(WARNING "GGML build version fixed at 1 likely due to a shallow clone.")
 endif()
 
 execute_process(COMMAND ${GIT_EXE} rev-parse --short HEAD
diff --git a/ggml/src/CMakeLists.txt b/ggml/src/CMakeLists.txt
index d4f383c55..8d2b948fb 100644
--- a/ggml/src/CMakeLists.txt
+++ b/ggml/src/CMakeLists.txt
@@ -252,10 +252,14 @@ function(ggml_add_backend_library backend)
     endif()
 
     if(NOT GGML_AVAILABLE_BACKENDS)
-        set(GGML_AVAILABLE_BACKENDS "${backend}" CACHE INTERNAL "List of backends for cmake package")
-    else()
-        set(GGML_AVAILABLE_BACKENDS "${GGML_AVAILABLE_BACKENDS};${backend}"
+        set(GGML_AVAILABLE_BACKENDS "${backend}"
             CACHE INTERNAL "List of backends for cmake package")
+    else()
+        list(FIND GGML_AVAILABLE_BACKENDS "${backend}" has_backend)
+        if(has_backend EQUAL -1)
+            set(GGML_AVAILABLE_BACKENDS "${GGML_AVAILABLE_BACKENDS};${backend}"
+                CACHE INTERNAL "List of backends for cmake package")
+        endif()
     endif()
 endfunction()