File size increases significantly after objcopy

[C Jaiprakash, Noida]

Hi,
  I am building colilo for a coldfire (v4e) target. I am facing a strange
problem. If i build colilo with -O0 option and convert the ELF binary to
bnary, srec format following are the resulting file sizes

-rwxr-xr-x    1 cjaiprakash coldfire      93K Nov 25 18:58 colilo.bin
-rwxr-xr-x    1 cjaiprakash coldfire     123K Nov 25 18:58 colilo.elf
-rw-r--r--    1 cjaiprakash coldfire     279K Nov 25 18:58 colilo.s19
-rw-r--r--    1 cjaiprakash coldfire     279K Nov 25 18:58 colilo.srec

But when i build the colilo with -O2 option file size increase
significantly, following are the sizes
-rwxr-xr-x    1 cjaiprakash coldfire      17M Nov 25 19:01 colilo.bin
-rwxr-xr-x    1 cjaiprakash coldfire     107K Nov 25 19:01 colilo.elf
-rw-r--r--    1 cjaiprakash coldfire      49M Nov 25 19:01 colilo.s19
-rw-r--r--    1 cjaiprakash coldfire      49M Nov 25 19:01 colilo.srec
 
ELF binary size is ok but why the file sizes for bin, srec are so huge? 

Thanks and best regards,
C Jaiprakash
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