diff --git a/CMakeLists.txt b/CMakeLists.txt
index 48ff15c570..5a65d2124f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -620,53 +620,3 @@ SET(CPACK_SOURCE_IGNORE_FILES
 INCLUDE(CPack)
 
 ADD_CUSTOM_TARGET(dist COMMAND ${CMAKE_MAKE_PROGRAM} clean package_source)
-
-#################### IWYU
-# Needs to be part of the top-level to be able to find all targets in the compiler framework.
-if(ENABLE_IWYU)
-  # Set up IWYU for P4C.
-  message("Enabling IWYU checks.")
-  find_program(iwyu_path NAMES include-what-you-use iwyu REQUIRED)
-  set(iwyu_path
-      ${iwyu_path}
-      -Xiwyu
-      --max_line_length=100
-      -Xiwyu
-      --no_fwd_decls
-      -Xiwyu
-      --cxx17ns
-      -Xiwyu
-      --mapping_file=${P4C_SOURCE_DIR}/tools/iwyu_mappings/p4c.imp
-  )
-  message("IWYU command: ${iwyu_path}")
-  function(get_all_targets var)
-    set(targets)
-    get_all_targets_recursive(targets ${CMAKE_CURRENT_SOURCE_DIR})
-    set(${var} ${targets} PARENT_SCOPE)
-  endfunction()
-
-  macro(get_all_targets_recursive targets dir)
-    get_property(subdirectories DIRECTORY ${dir} PROPERTY SUBDIRECTORIES)
-    foreach(subdir ${subdirectories})
-      get_all_targets_recursive(${targets} ${subdir})
-    endforeach()
-
-    get_property(current_targets DIRECTORY ${dir} PROPERTY BUILDSYSTEM_TARGETS)
-    list(APPEND ${targets} ${current_targets})
-  endmacro()
-
-  # Apply IWYU to all targets.
-  get_all_targets(all_targets)
-  # Remove generated files from IWYU.
-  list(FILTER all_targets EXCLUDE REGEX "controlplane-gen")
-  list(FILTER all_targets EXCLUDE REGEX "dpdk_runtime")
-  list(FILTER all_targets EXCLUDE REGEX "ir-generated")
-  list(FILTER all_targets EXCLUDE REGEX "genIR")
-  list(FILTER all_targets EXCLUDE REGEX "parser-gen")
-  list(FILTER all_targets EXCLUDE REGEX "gtest")
-  message("Applying IWYU to targets: ${all_targets}")
-  foreach(target ${all_targets})
-    set_property(TARGET ${target} PROPERTY CXX_INCLUDE_WHAT_YOU_USE ${iwyu_path})
-  endforeach()
-
-endif()
diff --git a/cmake/Abseil.cmake b/cmake/Abseil.cmake
index 54f9c7928e..cc81e1031e 100644
--- a/cmake/Abseil.cmake
+++ b/cmake/Abseil.cmake
@@ -46,6 +46,18 @@ macro(p4c_obtain_abseil)
     )
     fetchcontent_makeavailable_but_exclude_install(abseil)
 
+    # Suppress warnings for all Abseil targets.
+    get_all_targets(ABSL_BUILD_TARGETS ${absl_SOURCE_DIR})
+    foreach(target in ${ABSL_BUILD_TARGETS})
+      if(target MATCHES "absl_*")
+        # Do not suppress warnings for Abseil library targets that are aliased.
+        get_target_property(target_type ${target} TYPE)
+        if (NOT ${target_type} STREQUAL "INTERFACE_LIBRARY")
+          set_target_properties(${target} PROPERTIES COMPILE_FLAGS "-Wno-error -w")
+        endif()
+      endif()
+    endforeach()
+
     # Reset temporary variable modifications.
     set(CMAKE_UNITY_BUILD ${CMAKE_UNITY_BUILD_PREV})
     set(FETCHCONTENT_QUIET ${FETCHCONTENT_QUIET_PREV})
diff --git a/cmake/Linters.cmake b/cmake/Linters.cmake
index 1a10961c00..16c4d3ac85 100644
--- a/cmake/Linters.cmake
+++ b/cmake/Linters.cmake
@@ -143,3 +143,39 @@ if(NOT ${BLACK_CMD} OR NOT (NOT ${ISORT_CMD}))
 else()
   message(WARNING "black or isort executable not found. Disabling black/isort checks. black/isort can be installed with \"pip3 install --user --upgrade black\" and \"pip3 install --user --upgrade isort\" ")
 endif()
+
+#################### IWYU
+if(ENABLE_IWYU)
+  # Set up IWYU for P4C.
+  message("Enabling IWYU checks.")
+  find_program(iwyu_path NAMES include-what-you-use iwyu REQUIRED)
+  set(iwyu_path
+      ${iwyu_path}
+      -Xiwyu
+      --max_line_length=100
+      -Xiwyu
+      --no_fwd_decls
+      -Xiwyu
+      --cxx17ns
+      -Xiwyu
+      --mapping_file=${P4C_SOURCE_DIR}/tools/iwyu_mappings/p4c.imp
+  )
+  message("IWYU command: ${iwyu_path}")
+
+
+  get_all_targets(ALL_IWYU_TARGETS ${CMAKE_CURRENT_SOURCE_DIR})
+  # Apply IWYU to all targets.
+  get_all_targets(ALL_IWYU_TARGETS)
+  # Remove generated files from IWYU.
+  list(FILTER ALL_IWYU_TARGETS EXCLUDE REGEX "controlplane-gen")
+  list(FILTER ALL_IWYU_TARGETS EXCLUDE REGEX "dpdk_runtime")
+  list(FILTER ALL_IWYU_TARGETS EXCLUDE REGEX "ir-generated")
+  list(FILTER ALL_IWYU_TARGETS EXCLUDE REGEX "genIR")
+  list(FILTER ALL_IWYU_TARGETS EXCLUDE REGEX "parser-gen")
+  list(FILTER ALL_IWYU_TARGETS EXCLUDE REGEX "gtest")
+  message("Applying IWYU to targets: ${all_targets}")
+  foreach(target ${ALL_IWYU_TARGETS})
+    set_property(TARGET ${target} PROPERTY CXX_INCLUDE_WHAT_YOU_USE ${iwyu_path})
+  endforeach()
+
+endif()
diff --git a/cmake/P4CUtils.cmake b/cmake/P4CUtils.cmake
index ec694db392..0029d94554 100644
--- a/cmake/P4CUtils.cmake
+++ b/cmake/P4CUtils.cmake
@@ -433,3 +433,18 @@ macro(fetchcontent_makeavailable_but_exclude_install content)
     add_subdirectory(${${content}_SOURCE_DIR} ${${content}_BINARY_DIR} EXCLUDE_FROM_ALL)
   endif()
 endmacro(fetchcontent_makeavailable_but_exclude_install)
+
+# Collect all currently added targets in all subdirectories
+#
+# Parameters: - _result the list containing all found targets - _dir root directory to start
+# looking from
+# Sourced from https://stackoverflow.com/a/60232044
+function(get_all_targets _result _dir)
+  get_property(_subdirs DIRECTORY "${_dir}" PROPERTY SUBDIRECTORIES)
+  foreach(_subdir IN LISTS _subdirs)
+    get_all_targets(${_result} "${_subdir}")
+  endforeach()
+
+  get_directory_property(_sub_targets DIRECTORY "${_dir}" BUILDSYSTEM_TARGETS)
+  set(${_result} ${${_result}} ${_sub_targets} PARENT_SCOPE)
+endfunction()