CMake: don't modify global C_FLAGS and CXX_FLAGS

diff --git a/build/cmake/CMakeModules/AddZstdCompilationFlags.cmake b/build/cmake/CMakeModules/AddZstdCompilationFlags.cmake
index 05ad864393594f113a658d9299c4b7ba18f87560..e812418e3cdcb7739002915a043ccdd9b1b77881 100644 (file)
--- a/build/cmake/CMakeModules/AddZstdCompilationFlags.cmake
+++ b/build/cmake/CMakeModules/AddZstdCompilationFlags.cmake
@@ -9,13 +9,13 @@ function(EnableCompilerFlag _flag _C _CXX)
     if (_C)
         CHECK_C_COMPILER_FLAG(${_flag} C_FLAG_${varname})
         if (C_FLAG_${varname})
-            set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${_flag}" CACHE INTERNAL "C Flags")
+            set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${_flag}" PARENT_SCOPE)
         endif ()
     endif ()
     if (_CXX)
         CHECK_CXX_COMPILER_FLAG(${_flag} CXX_FLAG_${varname})
         if (CXX_FLAG_${varname})
-            set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${_flag}" CACHE INTERNAL "CXX Flags")
+            set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${_flag}" PARENT_SCOPE)
         endif ()
     endif ()
 endfunction()
@@ -69,8 +69,7 @@ MACRO(ADD_ZSTD_COMPILATION_FLAGS)
         separate_arguments(${flag_var})
         list(REMOVE_DUPLICATES ${flag_var})
         string(REPLACE ";" " " ${flag_var} "${${flag_var}}")
-        set(${flag_var} "${${flag_var}}" CACHE STRING "common build flags" FORCE)
-    ENDFOREACH (flag_var)  
+    ENDFOREACH (flag_var)
 
     if (MSVC)
         # Replace /MT to /MD flag
@@ -81,19 +80,7 @@ MACRO(ADD_ZSTD_COMPILATION_FLAGS)
                  CMAKE_CXX_FLAGS_MINSIZEREL CMAKE_CXX_FLAGS_RELWITHDEBINFO)
             STRING(REGEX REPLACE "/MT" "/MD" ${flag_var} "${${flag_var}}")
             STRING(REGEX REPLACE "/O2" "/Ox" ${flag_var} "${${flag_var}}")
-        ENDFOREACH (flag_var)      
+        ENDFOREACH (flag_var)
     endif ()
 
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}" CACHE STRING "Updated flags" FORCE)
-    set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG}" CACHE STRING "Updated flags" FORCE)
-    set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}" CACHE STRING "Updated flags" FORCE)
-    set(CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL}" CACHE STRING "Updated flags" FORCE)
-    set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO}" CACHE STRING "Updated flags" FORCE)
-
-    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS}" CACHE STRING "Updated flags" FORCE)
-    set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG}" CACHE STRING "Updated flags" FORCE)
-    set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE}" CACHE STRING "Updated flags" FORCE)
-    set(CMAKE_C_FLAGS_MINSIZEREL "${CMAKE_C_FLAGS_MINSIZEREL}" CACHE STRING "Updated flags" FORCE)
-    set(CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_RELWITHDEBINFO}" CACHE STRING "Updated flags" FORCE)
-
 ENDMACRO(ADD_ZSTD_COMPILATION_FLAGS)