cmake: Add WERROR option

It is meant to be used for CI

CMakeLists.txt

@@ -121,6 +121,7 @@ option(DEBUG_MUTEX     "Show debugging information regarding thread synchronisat
 option(NO_FAIR_MUTEX_QUEUEING "Disable fair mutex queueing. Debugging only." OFF)
 option(DEBUG_INPUT_SYNC "Print a debug message every time an event bundle is delivered to the OS." OFF)
 option(FPS_COUNTER     "Enable FPS counters." OFF)
+option(WERROR     "Enable Werror (for CI)" OFF)
 
 # Make sure NO_FAIR_MUTEX_QUEUEING is set if TSAN is enabled
 # Otherwise you end up with threading issues that are not detected

cmake/modules/CkbNextCompileFlags.cmake

@@ -82,3 +82,14 @@ list(APPEND CKB_NEXT_EXTRA_CXX_FLAGS
 
 string(REPLACE "-O2" "-O3" CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO}")
 string(REPLACE "-O2" "-O3" CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_RELWITHDEBINFO}")
+
+if(WERROR)
+    list(APPEND CKB_NEXT_EXTRA_C_FLAGS
+        -Werror
+        -Wno-error=cpp
+    )
+    list(APPEND CKB_NEXT_EXTRA_CXX_FLAGS
+        -Werror
+        -Wno-error=cpp
+    )
+endif()