Hi, > I believe that you need to use a few options to force gcc to do this. > Try the linker option that goes something like --gc-sections. This tells > the linker to garbage collect unused sections. If you use some functions > but not others, you can try telling the compiler to make a new section > for each function, something like -ffunction-sections.
i tried -Os and --retain-symbols-file -gfull --gc-sections -fdata-sections -ffunction-sections -fssa-dce -dead_strip nichts but these options do have no effect. If i call only the linker with that options some are reported as unknown or cause warnings/errors (and no output file in case of an error). So i converted every *.c file, execept main.c, to a library: msp430-ar -rcs libi2c.a ../i2c.o msp430-ar -rcs libmmc.a ../mmc.o ... msp430-gcc -mmcu=msp430x169 -o aout.elf ../main.o -Wl,-Map=aout.map--cref -L. -lflag -li2c -lmmc ... and the result is: > msp430-size aout.elf before: text data bss dec hex filename 19476 36 1596 21108 5274 aout.elf after: text data bss dec hex filename 17192 28 564 17784 4578 aout.elf so this works! I also tested without the unused mmc code: before: text data bss dec hex filename 17572 30 568 18170 46fa aout.elf after: text data bss dec hex filename 17192 28 564 17784 4578 aout.elf which shows that unused variables and functions from used files do not get linked! It seems this is the only way to remove dead (unused) code. Now i'm looking for a makefile which does this (conversion to libraries and linking that libs) automatically. Can someone give a link to such an example makefile? Regards, Rolf ------------------------------------------------------------------------------------------- > >i thought that only used code gets linked but i added some MMC/SDC > >code to a project and although that code is unused now and has not ISRs > >and gets compiled+linked without a warning it gets linked: > > > >without MMC/SDC code: > > msp430-size aout.elf > > text data bss dec hex filename > > 20114 30 568 20712 50e8 aout.elf > > > >with MMC/SDC code (only linked, not used): > > text data bss dec hex filename > > 22044 36 1596 23676 5c7c aout.elf > > > >How can i force not linking unused code? > > > >Regards, > > > >Rolf
