feat: support compiler.optimization_flags for Arduino IDE 2.X

Fixes #2159

Signed-off-by: Frederic Pillon <frederic.pillon@st.com>

Author: fpistm

platform.txt

@@ -17,6 +17,12 @@ compiler.warning_flags.default=
 compiler.warning_flags.more=-Wall
 compiler.warning_flags.all=-Wall -Wextra
 
+# EXPERIMENTAL feature: optimization flags
+#  - this is alpha and may be subject to change without notice
+compiler.optimization_flags={compiler.optimization_flags}
+compiler.optimization_flags.release={build.flags.optimize} {build.flags.debug}
+compiler.optimization_flags.debug=-Og -g
+
 compiler.path={runtime.tools.xpack-arm-none-eabi-gcc-12.2.1-1.2.path}/bin/
 
 compiler.S.cmd=arm-none-eabi-gcc
@@ -32,13 +38,13 @@ compiler.extra_flags=-mcpu={build.mcu} {build.fpu} {build.float-abi} -DVECT_TAB_
 
 compiler.S.flags={compiler.extra_flags} -c -x assembler-with-cpp {compiler.stm.extra_include}
 
-compiler.c.flags={compiler.extra_flags} -c {build.flags.optimize} {build.flags.debug} {compiler.warning_flags} -std={compiler.c.std} -ffunction-sections -fdata-sections --param max-inline-insns-single=500 -MMD {compiler.stm.extra_include}
+compiler.c.flags={compiler.extra_flags} -c {compiler.optimization_flags} {compiler.warning_flags} -std={compiler.c.std} -ffunction-sections -fdata-sections --param max-inline-insns-single=500 -MMD {compiler.stm.extra_include}
 
-compiler.cpp.flags={compiler.extra_flags} -c {build.flags.optimize} {build.flags.debug} {compiler.warning_flags} -std={compiler.cpp.std} -ffunction-sections -fdata-sections -fno-threadsafe-statics --param max-inline-insns-single=500 -fno-rtti -fno-exceptions -fno-use-cxa-atexit -MMD {compiler.stm.extra_include}
+compiler.cpp.flags={compiler.extra_flags} -c {compiler.optimization_flags} {compiler.warning_flags} -std={compiler.cpp.std} -ffunction-sections -fdata-sections -fno-threadsafe-statics --param max-inline-insns-single=500 -fno-rtti -fno-exceptions -fno-use-cxa-atexit -MMD {compiler.stm.extra_include}
 
 compiler.ar.flags=rcs
 
-compiler.c.elf.flags=-mcpu={build.mcu} {build.fpu} {build.float-abi} -mthumb {build.flags.optimize} {build.flags.debug} {build.flags.ldspecs} -Wl,--defsym=LD_FLASH_OFFSET={build.flash_offset} -Wl,--defsym=LD_MAX_SIZE={upload.maximum_size} -Wl,--defsym=LD_MAX_DATA_SIZE={upload.maximum_data_size} -Wl,--cref -Wl,--check-sections -Wl,--gc-sections -Wl,--entry=Reset_Handler -Wl,--unresolved-symbols=report-all -Wl,--warn-common
+compiler.c.elf.flags=-mcpu={build.mcu} {build.fpu} {build.float-abi} -mthumb {compiler.optimization_flags} {build.flags.ldspecs} -Wl,--defsym=LD_FLASH_OFFSET={build.flash_offset} -Wl,--defsym=LD_MAX_SIZE={upload.maximum_size} -Wl,--defsym=LD_MAX_DATA_SIZE={upload.maximum_data_size} -Wl,--cref -Wl,--check-sections -Wl,--gc-sections -Wl,--entry=Reset_Handler -Wl,--unresolved-symbols=report-all -Wl,--warn-common
 
 compiler.objcopy.eep.flags=-O ihex -j .eeprom --set-section-flags=.eeprom=alloc,load --no-change-warnings --change-section-lma .eeprom=0