From 278147f6e146a59f58e13d6cb2bf353b7c66a5b6 Mon Sep 17 00:00:00 2001
From: Daniel Lemire <daniel@lemire.me>
Date: Tue, 16 Jul 2024 11:39:19 -0400
Subject: [PATCH] fix: add --batch flag to PATCH_EXECUTABLE command

---
 cmake/CPM.cmake | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/cmake/CPM.cmake b/cmake/CPM.cmake
index b273c3bb..0b0098e1 100644
--- a/cmake/CPM.cmake
+++ b/cmake/CPM.cmake
@@ -516,7 +516,9 @@ function(cpm_add_patches)
       list(APPEND temp_list "&&")
     endif()
     # Add the patch command to the list
-    list(APPEND temp_list "${PATCH_EXECUTABLE}" "-p1" "<" "${PATCH_FILE}")
+    # The --batch flag is used to prevent the patch command from asking for user input
+    # and it does not apply the patch if it is unnecessary.
+    list(APPEND temp_list "${PATCH_EXECUTABLE}" "--batch" "-p1" "<" "${PATCH_FILE}")
   endforeach()
 
   # Move temp out into parent scope.