Hi to All, My current compiler settings are arm-none-eabi-gcc -Wall -mfpu=fpv4-sp-d16 -mfloat-abi=softfp -fshort-double-mcpu=cortex-m4 -mthumb -Qn -Os -finstrument-functions -mlong-calls -c temp.c -o temp.o so on for temp1, temp2... Etc I am compiling multiple C files. and linker settings are ld -r temp.o -o one.o so on for temp1, temp2... Etc I am linking multiple .O files. Also I am using linker script i.e link.txt (invoked externally as below) ld -cref -Map map.txt -S -T link.txt -temp.o -lm -lc -lgcc arm-none-eabi-gcc -Wall sample.o -O Firmware.abs Now, At output I get .abs file of 140KB. My Questions are 1. How to optimize (reduce size of .abs) by using complier or linker specific options?????? 2. There are Number of NOT used global variables and Blank Function Calls in my C files (NO Dead Code!!!!). Is it possible to perform some link time optimization?????????? 3. Please Elaborate as I am new to this, I have referred sites, gcc help and tried some "lto" options but NO reduction is size!!!!!!!!!!!!! 4. I also tried using -fdata-sections -ffunction-sections But It has INCREASED my firmware.abs file size from KB to MB (yes it is MB!!!!) I also wondered WHY?????????? I am using codesourcery arm toolchain evaluation. It has gcc version 4.5.2 Thanks for patiently reading my question.
