arch: xtensa: use optimization configs

Use optimization configs that come from Kconfig in CMake
to set appropriate compiler flags.

Signed-off-by: Janusz Jankowski <janusz.jankowski@linux.intel.com>

Author: jajanusz

src/arch/xtensa/CMakeLists.txt

@@ -61,6 +61,16 @@ else()
 	set(stdlib_flag "-nostdlib")
 endif()
 
+if(CONFIG_OPTIMIZE_FOR_PERFORMANCE)
+	set(optimization_flag "-O2")
+elseif(CONFIG_OPTIMIZE_FOR_SIZE)
+	set(optimization_flag "-Os")
+elseif(CONFIG_OPTIMIZE_FOR_DEBUG)
+	set(optimization_flag "-Og")
+elseif(CONFIG_OPTIMIZE_FOR_NONE)
+	set(optimization_flag "-O0")
+endif()
+
 # linker flags
 target_link_libraries(sof_options INTERFACE ${stdlib_flag} -Wl,--no-check-sections -ucall_user_start -Wl,-static)
 
@@ -77,7 +87,7 @@ target_compile_options(sof_options INTERFACE ${stdlib_flag} -fno-inline-function
 #      better to have set of default flags and change it only for special cases
 #   3) custom function that is used instead of target_sources and sets flags
 #      for each added source based on file extension
-target_compile_options(sof_options INTERFACE $<$<COMPILE_LANGUAGE:C>:-O2 -g -Wall -Werror -Wl,-EL -Wmissing-prototypes -Wpointer-arith -mtext-section-literals>)
+target_compile_options(sof_options INTERFACE $<$<COMPILE_LANGUAGE:C>: ${optimization_flag} -g -Wall -Werror -Wl,-EL -Wmissing-prototypes -Wpointer-arith -mtext-section-literals>)
 
 if(BUILD_UNIT_TESTS)
 	# rest of this file is not needed for unit tests