From 57978b0f7fd59a67da21cd9409e69b03dc14b6b8 Mon Sep 17 00:00:00 2001
From: Leonid Yuriev <leo@yuriev.ru>
Date: Mon, 28 Mar 2022 23:07:15 +0300
Subject: [PATCH] mdbx-cmake: add `remove_flag` and `remove_compile_flag`
 macros.

---
 cmake/utils.cmake | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/cmake/utils.cmake b/cmake/utils.cmake
index 066979b0..59320e7d 100644
--- a/cmake/utils.cmake
+++ b/cmake/utils.cmake
@@ -36,6 +36,23 @@ macro(add_compile_flags languages)
   unset(_flags)
 endmacro(add_compile_flags)
 
+macro(remove_flag varname flag)
+  string(REGEX REPLACE "^(.*)( ${flag} )(.*)$" "\\1 \\3" ${varname} ${${varname}})
+  string(REGEX REPLACE "^((.+ )*)(${flag})(( .+)*)$" "\\1\\4" ${varname} ${${varname}})
+endmacro(remove_flag)
+
+macro(remove_compile_flag languages flag)
+  foreach(_lang ${languages})
+    if(CMAKE_CXX_COMPILER_LOADED AND _lang STREQUAL "CXX")
+      remove_flag(${_lang}_FLAGS ${flag})
+    endif()
+    if(CMAKE_C_COMPILER_LOADED AND _lang STREQUAL "C")
+      remove_flag(${_lang}_FLAGS ${flag})
+    endif()
+  endforeach()
+  unset(_lang)
+endmacro(remove_compile_flag)
+
 macro(set_source_files_compile_flags)
   foreach(file ${ARGN})
     get_filename_component(_file_ext ${file} EXT)