On Fri, 08 Nov 2019 21:14:19 +0900 Oleg Endo <oleg.e...@t-online.de> wrote:
> On Thu, 2019-11-07 at 21:31 +0000, Jozef Lawrynowicz wrote: > > When building small programs for MSP430, the impact of the unused > > functions pulled in from the CRT libraries is quite noticeable. Most of > > these > > relates to feature that will never be used for MSP430 (Transactional memory, > > supporting shared objects and dynamic linking), or rarely used (exception > > handling). > > There's a magic switch, which does the business, at least for me, most > of the time: > > -flto > > If you're trying to bring down the executable size as much as possible, > but don't use -flto, I think something is wrong. > > Cheers, > Oleg > Yes, I should have used -flto in my examples. But it doesn't help remove these CRT library functions which are normally either directly added to the list of functions to run before main (via .init, .ctors or .init_array) or used in functions which are themselves added to this list. The unnecessary functions we want to remove are: deregister_tm_clones register_tm_clones __do_global_dtors_aux frame_dummy LTO can't remove any of them. Thanks, Jozef
