diff --git a/CMakeLists.txt b/CMakeLists.txt
index 69805e4a62e..59f56ceb74e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -259,6 +259,9 @@ endif()
 # @Intent: Add extended, more specific, toolchain warning flags
 toolchain_cc_warning_extended()
 
+# @Intent: Trigger an error when a declaration does not specify a type
+toolchain_cc_warning_error_implicit_int()
+
 # Allow the user to inject options when calling cmake, e.g.
 # 'cmake -DEXTRA_CFLAGS="-Werror -Wno-deprecated-declarations" ..'
 include(cmake/extra_flags.cmake)
@@ -292,9 +295,6 @@ endif()
 
 zephyr_cc_option_ifdef(CONFIG_STACK_USAGE            -fstack-usage)
 
-# Force an error when things like SYS_INIT(foo, ...) occur with a missing header.
-zephyr_cc_option(-Werror=implicit-int)
-
 # If the compiler supports it, strip the ${ZEPHYR_BASE} prefix from the
 # __FILE__ macro used in __ASSERT*, in the
 # .noinit."/home/joe/zephyr/fu/bar.c" section names and in any
@@ -303,9 +303,6 @@ zephyr_cc_option(-Werror=implicit-int)
 # importantly makes builds more deterministic
 zephyr_cc_option(-fmacro-prefix-map=${ZEPHYR_BASE}=.)
 
-# Prohibit date/time macros, which would make the build non-deterministic
-# cc-option(-Werror=date-time)
-
 # TODO: Archiver arguments
 # ar_option(D)
 
diff --git a/cmake/compiler/clang/target_warnings.cmake b/cmake/compiler/clang/target_warnings.cmake
index 129f7643f05..771726f5a96 100644
--- a/cmake/compiler/clang/target_warnings.cmake
+++ b/cmake/compiler/clang/target_warnings.cmake
@@ -95,6 +95,13 @@ macro(toolchain_cc_warning_extended)
 
 endmacro()
 
+macro(toolchain_cc_warning_error_implicit_int)
+
+  # Force an error when things like SYS_INIT(foo, ...) occur with a missing header
+  zephyr_cc_option(-Werror=implicit-int)
+
+endmacro()
+
 #
 # The following macros leaves it up to the root CMakeLists.txt to choose
 #  the variables in which to put the requested flags, and whether or not
diff --git a/cmake/compiler/gcc/target_warnings.cmake b/cmake/compiler/gcc/target_warnings.cmake
index 3152ded8121..a14233d0313 100644
--- a/cmake/compiler/gcc/target_warnings.cmake
+++ b/cmake/compiler/gcc/target_warnings.cmake
@@ -81,6 +81,13 @@ macro(toolchain_cc_warning_extended)
 
 endmacro()
 
+macro(toolchain_cc_warning_error_implicit_int)
+
+  # Force an error when things like SYS_INIT(foo, ...) occur with a missing header
+  zephyr_cc_option(-Werror=implicit-int)
+
+endmacro()
+
 #
 # The following macros leaves it up to the root CMakeLists.txt to choose
 #  the variables in which to put the requested flags, and whether or not