From 206f126617602ffa0b46b4eb45a9d41b6047d24f Mon Sep 17 00:00:00 2001
From: Campbell Barton <campbell@blender.org>
Date: Sat, 12 Aug 2023 16:29:46 +1000
Subject: [PATCH] Fix regression in remove_cc_flag macro

Recent change in [0] caused the CFLAGS variables not to be manipulated
by remove_cc_flag. Unfortunately EVAL is needed to set a variable
that references a variable name.

[0]: e95e6ad66a8341641b6086806ebcc5988ed12ac0
---
 build_files/cmake/macros.cmake | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/build_files/cmake/macros.cmake b/build_files/cmake/macros.cmake
index 5acb3bd13c5..cef3b31001d 100644
--- a/build_files/cmake/macros.cmake
+++ b/build_files/cmake/macros.cmake
@@ -753,7 +753,12 @@ macro(remove_cc_flag
 
   foreach(_flag ${ARGV})
     foreach(_var ${_flag_vars})
-      string(REGEX REPLACE ${_flag} "" "${_var}" "${${_var}}")
+      # Expands to an expression like:
+      # `string(REGEX REPLACE "${_flag}" "" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")`
+      cmake_language(
+        EVAL CODE
+        "string(REGEX REPLACE \"\$\{_flag\}\" \"\" ${_var} \"\$\{${_var}\}\")"
+      )
     endforeach()
   endforeach()