Enable LTO

Author: cmaglie

Diff for: hardware/arduino/avr/platform.txt

@@ -20,13 +20,13 @@ compiler.warning_flags.all=-Wall -Wextra
 # Default "compiler.path" is correct, change only if you want to override the initial value
 compiler.path={runtime.tools.avr-gcc.path}/bin/
 compiler.c.cmd=avr-gcc
-compiler.c.flags=-c -g -Os {compiler.warning_flags} -std=gnu11 -ffunction-sections -fdata-sections -MMD
-compiler.c.elf.flags={compiler.warning_flags} -Os -Wl,--gc-sections
+compiler.c.flags=-c -g -Os {compiler.warning_flags} -std=gnu11 -ffunction-sections -fdata-sections -MMD -flto -fno-fat-lto-objects
+compiler.c.elf.flags={compiler.warning_flags} -Os -Wl,--gc-sections -flto -fuse-linker-plugin
 compiler.c.elf.cmd=avr-gcc
-compiler.S.flags=-c -g -x assembler-with-cpp
+compiler.S.flags=-c -g -x assembler-with-cpp -flto
 compiler.cpp.cmd=avr-g++
-compiler.cpp.flags=-c -g -Os {compiler.warning_flags} -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -MMD
-compiler.ar.cmd=avr-ar
+compiler.cpp.flags=-c -g -Os {compiler.warning_flags} -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -MMD -flto
+compiler.ar.cmd=avr-gcc-ar
 compiler.ar.flags=rcs
 compiler.objcopy.cmd=avr-objcopy
 compiler.objcopy.eep.flags=-O ihex -j .eeprom --set-section-flags=.eeprom=alloc,load --no-change-warnings --change-section-lma .eeprom=0