The linker option --gc-sections (ie, from the GCC command line: -ffunction-sections -fdata-sections -Wl,--gc-sections Will do the collection. You need the two -f options so that the compiler puts each function/data item into a separate section, and then the --gc-sections option will enable the linker to remove any section that is not referenced. -- Michael Meissner AMD, MS 83-29 90 Central Street Boxborough, MA 01719 -----Original Message----- From: gcc-help-owner@xxxxxxxxxxx [mailto:gcc-help-owner@xxxxxxxxxxx] On Behalf Of Jason Lam Sent: Tuesday, May 23, 2006 3:35 PM To: John Carter Cc: gcc-help@xxxxxxxxxxx Subject: Re: Linking un-referenced function Thanks for the quick response, John. It looks like these options will arrange the functions to different sections in the final image but it still doesn't exclude them. Am I missing something? Thanks, Jason --- John Carter <john.carter@xxxxxxxxxx> wrote: > On Mon, 22 May 2006, Jason Lam wrote: > > > I looked through the documents and couldn't find > an > > option to not link an un-referenced function into > the > > final image. Does GCC support it? Could someone > > please help? > > Sorry, I got confuddled... > > Use > `--gc-sections' > option on linker and... > > > `-ffunction-sections' > `-fdata-sections' > Place each function or data item into its own > section in the output > file if the target supports arbitrary > sections. The name of the > function or the name of the data item > determines the section's name > in the output file. > > Use these options on systems where the linker > can perform > optimizations to improve locality of reference > in the instruction > space. Most systems using the ELF object > format and SPARC > processors running Solaris 2 have linkers with > such optimizations. > AIX may have these optimizations in the > future. > > Only use these options when there are > significant benefits from > doing so. When you specify these options, the > assembler and > linker will create larger object and > executable files and will > also be slower. You will not be able to use > `gprof' on all > systems if you specify this option and you may > have problems with > debugging if you specify both this option and > `-g'. > > > John Carter Phone : > (64)(3) 358 6639 > Tait Electronics Fax : > (64)(3) 359 4632 > PO Box 1645 Christchurch Email : > john.carter@xxxxxxxxxx > New Zealand > > Carter's Clarification of Murphy's Law. > > "Things only ever go right so that they may go more > spectacularly wrong later." > > From this principle, all of life and physics may be > deduced. > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
