From 3ffc8a6b613e5b31ed75d25b28b86a5ebabdf9ce Mon Sep 17 00:00:00 2001
From: Peter Kokot <peterkokot@gmail.com>
Date: Sun, 20 Oct 2024 15:36:17 +0200
Subject: [PATCH] FindBISON: Add COMMAND_EXPAND_LISTS to remove empty arguments

When using generator expressions in the COMPILE_FLAGS argument, and the
generator expression expands to an empty string, command gets an empty
argument with double quotes where GNU bison command-line tool errors out
with `/usr/bin/bison: extra operand` error. This removes empty arguments
from the created bison command.
---
 Modules/FindBISON.cmake | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Modules/FindBISON.cmake b/Modules/FindBISON.cmake
index 3515bf0ddd..6d0ace7aad 100644
--- a/Modules/FindBISON.cmake
+++ b/Modules/FindBISON.cmake
@@ -281,7 +281,8 @@ if(BISON_EXECUTABLE)
         VERBATIM
         DEPENDS ${_BisonInput}
         COMMENT "[BISON][${Name}] Building parser with bison ${BISON_VERSION}"
-        WORKING_DIRECTORY ${_BISON_WORKING_DIRECTORY})
+        WORKING_DIRECTORY ${_BISON_WORKING_DIRECTORY}
+        COMMAND_EXPAND_LISTS)
 
       unset(_BISON_WORKING_DIRECTORY)