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2014-06-19 10:29 <kyak> hm.. i'm about to try that, but perhaps someone already knows
2014-06-19 10:29 <kyak> i have a function with empty body in C. Would it appear in object code?
2014-06-19 10:29 <kyak> does it depend on optimization options? which options?
2014-06-19 10:31 <kyak> if this function is not referenced, is it up the linker maybe to remove this function? And what if it is referenced?
2014-06-19 10:39 <larsc> if it is externally visible it will not be removed
2014-06-19 10:39 <larsc> if it is a static function will most likely be removed
2014-06-19 10:39 <larsc> if you turn off optimization it will still stay, I guess
2014-06-19 10:40 <larsc> the linker may or may not remove it
2014-06-19 10:40 <larsc> if it is for example a shared lib it must not remove it
2014-06-19 10:41 <larsc> if it is a application it might remove it
2014-06-19 10:41 <larsc> if it is a static library linked into a application it also might remove it
2014-06-19 10:43 <kyak> okay ,thanks for the hints - i will have to experiment with my specific compiler and linker to make sure
2014-06-19 10:48 <kyak> this seems to be called as "cross-module optimization" for linker. "When enabled, unreferenced functions will be removed."
2014-06-19 10:50 <larsc> aka LTO
2014-06-19 10:51 <kyak> that would be … ?
2014-06-19 10:51 <larsc> link-time-optimization
2014-06-19 10:52 <larsc> that's what gcc calls it
2014-06-19 10:54 <kyak> ah!
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2014-06-19 16:21 <wpwrak> aah ! someone wrote a forum system that has the concept of heise.de. finally ! https://code.google.com/p/freech/
2014-06-19 16:23 <whitequark> you could also avoid LTO (it's costly) by using -ffunction-sections in gcc
2014-06-19 16:23 <whitequark> that's how libc allows for tiny static builds
2014-06-19 16:28 <eintopf> `hi :-)
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2014-06-19 16:57 <larsc> wpwrak: I think the heise system is horrible
2014-06-19 17:02 <wpwrak> you prefer those fora that show you pages upon pages with articles ?
2014-06-19 17:02 <wpwrak> everything linear, no branches in threads. or if they exist they're nearly invisible
2014-06-19 17:03 <whitequark> branches don't work
2014-06-19 17:03 <whitequark> well, not as traditionally done
2014-06-19 17:08 <wpwrak> have you looked at heise.de ? there the structure is very clear
2014-06-19 17:12 <eintopf> hi :-)
2014-06-19 17:12 <eintopf> wpwrak: the heise forums contents are...
2014-06-19 17:12 <eintopf> crazy
2014-06-19 17:17 <wpwrak> the content ? naw, there's often good stuff there
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