diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3aa2be051..34154564f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,6 +8,8 @@ set(CMAKE_CXX_EXTENSIONS OFF)
 option(ODR_TEST "enable tests" ON)
 option(ODR_CLANG_TIDY "Run clang-tidy static analysis" OFF)
 
+set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)
+
 # TODO defining global compiler flags seems to be bad practice with conan
 # TODO consider using conan profiles
 if (CMAKE_CXX_COMPILER_ID STREQUAL "Clang" OR
diff --git a/test/data/reference-output/odr-private b/test/data/reference-output/odr-private
index 1b54e4523..d201fef71 160000
--- a/test/data/reference-output/odr-private
+++ b/test/data/reference-output/odr-private
@@ -1 +1 @@
-Subproject commit 1b54e452350216edfe09dfd697af002add29fa87
+Subproject commit d201fef71c9d470369e55ffd2cecbc9d2e4e2e84
diff --git a/test/data/reference-output/odr-public b/test/data/reference-output/odr-public
index 5d02b56b8..4429328a5 160000
--- a/test/data/reference-output/odr-public
+++ b/test/data/reference-output/odr-public
@@ -1 +1 @@
-Subproject commit 5d02b56b870baaf6b147fa5711ed0e3ab998700b
+Subproject commit 4429328a514c1adc1f47343247c458f37bf06f9f