Fix #426, conditional module inclusion

CMakeLists.txt

@@ -28,6 +28,7 @@ target_include_directories(psp_module_api INTERFACE
 
 # Translate the CFE_PSP_TARGETNAME to a set of additional modules to build
 file(STRINGS "${CMAKE_CURRENT_LIST_DIR}/fsw/${CFE_PSP_TARGETNAME}/psp_module_list.cmake" PSP_TARGET_MODULE_LIST REGEX "^[a-zA-Z]")
+include("${CMAKE_CURRENT_LIST_DIR}/fsw/${CFE_PSP_TARGETNAME}/psp_conditional_modules.cmake" OPTIONAL)
 
 # The PSP is currently built in modular parts, consisting of a platform-specific
 # module(s) combined with a shared component which is built for multiple targets.
@@ -72,4 +73,3 @@ if (ENABLE_UNIT_TESTS)
     add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/ut-stubs)
     add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/unit-test-coverage)
 endif ()
-

fsw/pc-rtems/psp_conditional_modules.cmake

@@ -0,0 +1,8 @@
+# The sysmon module only works in RTEMS >= 5.
+# Ideally this check should be VERSION_GREATER_EQUAL 5, but that conditional does
+# not exist in all versions of cmake.
+if(CMAKE_SYSTEM_VERSION VERSION_GREATER 4.99)
+
+    list(APPEND PSP_TARGET_MODULE_LIST rtems_sysmon)
+
+endif()

fsw/pc-rtems/psp_module_list.cmake

@@ -1,10 +1,13 @@
 # This is a list of modules that is included as a fixed/base set
-# when this PSP is selected.  They must exist under fsw/modules
+# when this PSP is selected.  They must exist under fsw/modules.
+
+# NOTE: This set is REQUIRED for all versions of the platform.
+# If a module only works on some versions of the platform, add
+# if to psp_conditional_modules.cmake instead
 
 soft_timebase
 timebase_posix_clock
 eeprom_notimpl
 ram_direct
 port_notimpl
 iodriver
-rtems_sysmon