Dropping unused functions out of linked file

Ian Lance Taylor ian@airs.com
Thu May 26 00:24:00 GMT 2005

"Brian Smith" <bsmith@tytronics.com.au> writes:

> Is there any way during the link or compile processes to drop out
> functions and variables that are not used? Part of my source code
> includes generic modules provided by another vendor and I only need
> about 30% of the code that is in those source files. The optimisation
> -Os does not drop them out and I can see no options in the link
> process to do this. I am using the MSP430 port of gcc though this
> seems to be a GCC thing rather than specific to the MSP430 port.

Compile with -ffunction-sections -fdata-sections.  Link with
-Wl,--gc-sections.  This only works if you are using the GNU linker.


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