zephyr/cmake/compiler/gcc/target_optimizations.cmake

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# See root CMakeLists.txt for description and expectations of this macro
#
# NOTE: Some GNU toolchains break with plain '-Os' or '-Og', but is fixable
# with tweaks. So allow user to override, via ifndef, the compile flags that
# CONFIG_{NO,DEBUG,SPEED,SIZE}_OPTIMIZATIONS will cause, yet still leaving the
# selection logic in kconfig.
#
# These macros leaves it up to the root CMakeLists.txt to choose the CMake
# variable names to store the optimization flags in.
macro(toolchain_cc_optimize_for_no_optimizations_flag dest_var_name)
set_ifndef(${dest_var_name} "-O0")
endmacro()
macro(toolchain_cc_optimize_for_debug_flag dest_var_name)
set_ifndef(${dest_var_name} "-Og")
endmacro()
macro(toolchain_cc_optimize_for_speed_flag dest_var_name)
set_ifndef(${dest_var_name} "-O2")
endmacro()
macro(toolchain_cc_optimize_for_size_flag dest_var_name)
set_ifndef(${dest_var_name} "-Os")
endmacro()