On Mon, Jun 29, 2015 at 10:02 AM, Peter Dufault <dufa...@hda.com> wrote: > >> On Jun 29, 2015, at 09:28 , Sebastian Huber >> <sebastian.hu...@embedded-brains.de> wrote: >> >>> By only including the RTEMS shell commands I use I reduced the size to >>> 1839664 (latest RTEMS) vs 1624684 (September RTEMS), about a 13% increase, >>> but at least it fits in FLASH. >>> >>> The overhead appears to be mostly all the locale “stuff” in g++ 4.9.2 vs >>> g++ 4.8.2. I did some googling but don’t see how to reduce this, does >>> anyone know of a way? I really don’t need currency customization. >> >> What pulls in this locale stuff? Maybe >> >> CFLAGS += -ffunction-sections -fdata-sections >> >> LDFLAGS = -Wl,--gc-sections >> >> helps? > > I don’t know what pulls in the locale stuff or how to disable it. > > Your suggested flags makes a huge difference, it’s now 1424272 bytes in size, > at 12% decrease from September and a 22% decrease from building the > application with gcc 4.9.2 without the flags. I don’t see as much locale > stuff in there. I only recompiled the user application code and not RTEMS > itself. > > Even better the application still runs. > > How can these options change what gets linked in? > These options let the compiler put every function in its own section and use extra data sections, and the linker to remove any that are unused. So it can provide a fine-tune way to remove unused code at link time, but you need to be careful to mark any special sections that must not be garbage-collected. I think Joel did this for the SPARC. As you noticed, the options can make a big difference!
> Peter > ----------------- > Peter Dufault > HD Associates, Inc. Software and System Engineering > > _______________________________________________ > devel mailing list > devel@rtems.org > http://lists.rtems.org/mailman/listinfo/devel _______________________________________________ devel mailing list devel@rtems.org http://lists.rtems.org/mailman/listinfo/devel
