[avr-gcc-list] Linker optimization

[Bob Hansen]

If I create a file test1.c that reads

int main( void )
{
}

and compile the file with
avr-gcc -Os -Wl,-Map=test1.map,--cref -mmcu=at90s8515 -o test1.elf test1.c
the generated map file indicates that the .text segment is 0x60 bytes, and 
main is 0x04 bytes long.  Cool.

If I then alter test1.c to be

void foo( void )
{
  foo();
}
int main( void )
{
}

and compile the file with
avr-gcc -Os -Wl,-Map=test1.map,--cref -mmcu=at90s8515 -o test1.elf test1.c
the generated map file indicates that the .text segment is 0x64 bytes, and 
foo() is 4 bytes long and linked into the program.

Is there some linker flag that I should be including to tell the linker to 
ditch any unused functions?  I noticed a while back that all of my unused 
library functions were still making it into the finished executable and 
taking up useless space.

Thanks,
-Bob Hansen

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