CMake: Disable -Wall, disable LTO for GCC+gold

CMakeLists.txt

@@ -252,9 +252,9 @@ else()
   endif()
   add_compile_options($<$<COMPILE_LANGUAGE:CXX>:-fno-rtti>
                       $<$<COMPILE_LANGUAGE:CXX>:-fno-exceptions>
-                      -Wall -Wno-multichar -Werror=implicit-fallthrough
+                      -Wall -Wno-multichar
                       -Wno-unused-variable -Wno-unused-result -Wno-unused-but-set-variable
-                      -Wno-unused-function -Wno-sign-compare -Wno-unknown-pragmas -Werror)
+                      -Wno-unused-function -Wno-sign-compare -Wno-unknown-pragmas)
   # doesn't work with generator expression in add_compile_options?
   if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang" OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "AppleClang")
     add_compile_options(-Wno-unknown-warning-option -Wno-unused-private-field)

CMakePresets.json

@@ -29,7 +29,11 @@
       "generator": "Ninja",
       "binaryDir": "${sourceDir}/build/${presetName}",
       "cacheVariables": {
-        "CMAKE_INSTALL_PREFIX": "${sourceDir}/build/install"
+        "CMAKE_INSTALL_PREFIX": "${sourceDir}/build/install",
+        "USE_LTO": {
+          "type": "BOOL",
+          "value": false
+        }
       },
       "vendor": {
         "microsoft.com/VisualStudioSettings/CMake/1.0": {
@@ -66,7 +70,11 @@
       ],
       "cacheVariables": {
         "CMAKE_C_COMPILER": "clang",
-        "CMAKE_CXX_COMPILER": "clang++"
+        "CMAKE_CXX_COMPILER": "clang++",
+        "USE_LTO": {
+          "type": "BOOL",
+          "value": true
+        }
       }
     },
     {