CHANGELOG.md

@@ -49,6 +49,16 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - LTO support: Allow using LTO/IPO by setting `FSFW_ENABLE_LTO=1`. CMake is able to detect whether
   the user compiler supports IPO/LPO. LTO is on by default now. Most modern compilers support it,
   can make good use of it and it usually makes the code faster and/or smaller.
+  After some more research:
+  Enabling LTO will actually cause the compiler to only produce thin LTO by adding 
+  `-flto -fno-fat-lto-objects` to the compiler options. I am not sure this is an ideal choice
+  because if an application linking against the FSFW does not use LTO, there can be compile
+  issues (e.g. observed when compiling the FSFW tests without LTO). This is a known issue as
+  can be seen in the multiple CMake issues for it: 
+    - https://gitlab.kitware.com/cmake/cmake/-/issues/22913, 
+    - https://gitlab.kitware.com/cmake/cmake/-/issues/16808, 
+    - https://gitlab.kitware.com/cmake/cmake/-/issues/21696
+  Easiest solution for now: Keep this option OFF by default.
   PR: https://egit.irs.uni-stuttgart.de/fsfw/fsfw/pulls/616
 - Linux HAL: Add wiretapping option for I2C. Enabled with `FSFW_HAL_I2C_WIRETAPPING` defined to 1
 - Dedicated Version class and constant `fsfw::FSFW_VERSION` containing version information

CMakeLists.txt

@@ -40,21 +40,17 @@ set(FSFW_FMT_LIB_VERSION v${FSFW_FMT_LIB_MAJOR_VERSION}.1.1 CACHE STRING
   "{fmt} library exact version requirement"
   )
 
-include(CheckIPOSupported)
-check_ipo_supported(RESULT IPO_SUPPORTED OUTPUT IPO_ERROR)
-if(NOT IPO_SUPPORTED)
-  message(STATUS "FSFW | IPO/LTO not supported: ${IPO_ERROR}")
+# Keep this off by default for now. See PR: https://egit.irs.uni-stuttgart.de/fsfw/fsfw/pulls/616
+# for information which keeping this on by default is problematic
+option(FSFW_ENABLE_IPO "Enable interprocedural optimization or link-time optimization if available" OFF)
+if(FSFW_ENABLE_IPO)
+  include(CheckIPOSupported)
+  check_ipo_supported(RESULT IPO_SUPPORTED OUTPUT IPO_ERROR)
+  if(NOT IPO_SUPPORTED)
+    message(STATUS "FSFW | IPO/LTO not supported: ${IPO_ERROR}")
+  endif()
 endif()
 
-option(FSFW_ENABLE_IPO "Enable interprocedural optimization or link-time optimization if available" ON)
-
-include(CheckIPOSupported)
-check_ipo_supported(RESULT IPO_SUPPORTED OUTPUT IPO_ERROR)
-if(NOT IPO_SUPPORTED)
-  message(STATUS "FSFW | IPO/LTO not supported: ${IPO_ERROR}")
-endif()
-
-option(FSFW_ENABLE_IPO "Enable interprocedural optimization or link-time optimization if available" ON)
 option(FSFW_GENERATE_SECTIONS
   "Generate function and data sections. Required to remove unused code" ON
   )