made ld.mold the default on linux

CMakeLists.txt

@@ -13,7 +13,8 @@ set(GLOW_USE_OWN_GLAD ON CACHE BOOL "If true, extern/glad is used")
 
 # build options
 set(GLOW_LINK_TYPE SHARED CACHE STRING "Defines the build type of libraries (shared is default)")
-set(GLOW_USE_GOLD_LINKER ON CACHE BOOL "If true, ld.gold is used for linking")
+set(GLOW_USE_MOLD_LINKER ON CACHE BOOL "If true, ld.mold is used for linking")
+set(GLOW_USE_GOLD_LINKER OFF CACHE BOOL "If true, ld.gold is used for linking")
 set(GLOW_ENABLE_MARCH_NATIVE ON CACHE BOOL "If true, adds -march=native")
 
 # misc
@@ -110,8 +111,11 @@ if(NOT MSVC)
 
     target_link_libraries(glow PUBLIC pthread)
 
+    # mold linker
+    if(GLOW_USE_MOLD_LINKER)
+        target_link_libraries(glow PUBLIC  -fuse-ld=mold)
     # gold linker
-    if(GLOW_USE_GOLD_LINKER)
+    elseif(GLOW_USE_GOLD_LINKER)
         # WRONG: target_compile_options(glow PUBLIC -fuse-ld=gold )
         target_link_libraries(glow PUBLIC  -fuse-ld=gold)
     endif()