From b67245d71e3a9bb4819d85ffe4a6bf1091688c46 Mon Sep 17 00:00:00 2001
From: glx22 <glx@openttd.org>
Date: Mon, 22 Feb 2021 19:02:48 +0100
Subject: Fix: [CMake] CMake may use || at the end of custom commands

---
 cmake/scripts/SquirrelIncludes.cmake | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/cmake/scripts/SquirrelIncludes.cmake b/cmake/scripts/SquirrelIncludes.cmake
index e64e2d25a..672ad0953 100644
--- a/cmake/scripts/SquirrelIncludes.cmake
+++ b/cmake/scripts/SquirrelIncludes.cmake
@@ -16,11 +16,18 @@ endif()
 set(ARGC 1)
 set(ARG_READ NO)
 
+# For MSVC CMake runs this script from a batch file using || to detect errors,
+# depending on source path it may quote args, and cause cmd to not understand ||
+# and pass it as argument to ourself.
 # Read all the arguments given to CMake; we are looking for -- and everything
-# that follows. Those are our api files.
+# that follows, until ||. Those are our api files.
 while(ARGC LESS CMAKE_ARGC)
     set(ARG ${CMAKE_ARGV${ARGC}})
 
+    if(ARG STREQUAL "||")
+        set(ARG_READ NO)
+    endif()
+
     if(ARG_READ)
         list(APPEND SCRIPT_API_BINARY_FILES "${ARG}")
     endif()
-- 
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