Hieu Le Trung schrieb:
Hi, I wonder what is the different between -Os and -O2 and where can I find more information relating to this.
Add -fverbose-asm to gcc's command line and have a look at the generated gcc output, i.e. the assembler code in the .s file. You can get the asm file by specifying -save-temps or by assembling only (-S, no -c).
Maybe the target supports -frecord-gcc-switches and you can find the command line/switches induced in some section of the object file (and, of course, in that case in the assembler, too).
Georg-Johann
