From 93f584e5ef240df9459ee746c3b0f165161a51d3 Mon Sep 17 00:00:00 2001
From: Michael D Starch <Michael.D.Starch@jpl.nasa.gov>
Date: Thu, 6 Feb 2025 12:53:10 -0800
Subject: [PATCH] Create empty library to avoid 3.16 limitations on interface
 libs

---
 Fw/Types/CMakeLists.txt | 2 +-
 cmake/module.cmake      | 1 +
 cmake/valid-empty.cpp   | 1 +
 3 files changed, 3 insertions(+), 1 deletion(-)
 create mode 100644 cmake/valid-empty.cpp

diff --git a/Fw/Types/CMakeLists.txt b/Fw/Types/CMakeLists.txt
index 27dce5ae95..01cd6474c7 100644
--- a/Fw/Types/CMakeLists.txt
+++ b/Fw/Types/CMakeLists.txt
@@ -38,5 +38,5 @@ register_fprime_ut()
 add_fprime_subdirectory("${CMAKE_CURRENT_LIST_DIR}/GTest")
 
 # Create an empty interface library and use it to register an implementation
-add_library(snprintf-format INTERFACE)
+add_library(snprintf-format ${VALID_EMPTY})
 register_fprime_implementation(Fw_StringFormat snprintf-format "${CMAKE_CURRENT_LIST_DIR}/snprintf_format.cpp")
diff --git a/cmake/module.cmake b/cmake/module.cmake
index e8ba77b41d..6078ec4d0d 100644
--- a/cmake/module.cmake
+++ b/cmake/module.cmake
@@ -11,6 +11,7 @@ include_guard()
 include(target/target)
 include(implementation)
 set(EMPTY "${FPRIME_FRAMEWORK_PATH}/cmake/empty.cpp")
+set(VALID_EMPTY "${FPRIME_FRAMEWORK_PATH}/cmake/valid-empty.cpp")
 
 ####
 # Function `generate_base_module_properties`:
diff --git a/cmake/valid-empty.cpp b/cmake/valid-empty.cpp
new file mode 100644
index 0000000000..1c610b86f5
--- /dev/null
+++ b/cmake/valid-empty.cpp
@@ -0,0 +1 @@
+static constexpr bool __INTENTIONALLY_UNUSED_SYMBOL__ = false;