lib/heap: Prevent toolchain from using LTO when building heap_constants.c.obj

This object file is used to have the compiler compute various constants
with the results being extracted with a python script. If LTO is used, none
of those constants will end up in the resulting object file.

Signed-off-by: Keith Packard <keithp@keithp.com>

Author: keith-packard

CMakeLists.txt

@@ -1048,6 +1048,9 @@ target_include_directories(${OFFSETS_LIB} PRIVATE
 # Make sure that LTO will never be enabled when compiling offsets.c
 set_source_files_properties(${OFFSETS_C_PATH} PROPERTIES COMPILE_OPTIONS $<TARGET_PROPERTY:compiler,prohibit_lto>)
 
+# Make sure that LTO will never be enabled when compiling heap_constants.c
+set_source_files_properties(${ZEPHYR_BASE}/lib/heap/heap_constants.c PROPERTIES COMPILE_OPTIONS $<TARGET_PROPERTY:compiler,prohibit_lto>)
+
 target_sources(${OFFSETS_LIB} PRIVATE ${ZEPHYR_BASE}/lib/heap/heap_constants.c)
 
 target_link_libraries(${OFFSETS_LIB} zephyr_interface)