Kang Tin LAI schrieb:
Hi,
My old code (a bootloader) compiled with 4.0.3 + avr-libc 1.4.4 the code
size is 1068 bytes, but same code compiled with 4.3.3 + avr-libc 1.6.6
the code size is 1332 bytes!
Optimization option is -Os, boot_page_xxx and boot_rww_xxx library
functions are called only.
Have a look at the asm code that avr-gcc generates together with
-fverbose-asm. To get the asm code specify -save-temps.
The .s will list the -f switches enabled by -Os. Look out for switches
that changed from 4.0.3 to 4.3.3. Observe their effect on the generated
asm by diff'ing avr-gcc's output.
Maybe some of
-fno-inline-small-function
-fno-split-wide-types
-fno-move-loop-invariants
or setting inline limits will bring some improvement.
Georg-Johann
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