On Mon, Feb 28, 2011 at 7:22 PM, Steve Ellcey <s...@cup.hp.com> wrote: > On Sat, 2011-02-26 at 18:45 +0100, Richard Guenther wrote: >> On Sat, Feb 26, 2011 at 12:22 AM, Steve Ellcey <s...@cup.hp.com> wrote: >> > >> > I am looking at an lto bug on ia64-hp-hpux11.23. If I compile >> > g++.dg/torture/pr33572.C with -flto on this platform I get: >> > >> > ld: Unsatisfied symbol "__gcc_personality_v0" in file >> > /var/tmp//ccYlpGzO.ltrans0.ltrans.o >> > 1 errors. >> > collect2: ld returned 1 exit status >> > >> > (This is using the HP linker which I do for all my GCC builds.) >> >> so you do not have the linker-plugin? > > Correct. > >> I think this hints at an issue with the collect2 LTO path. It would >> be interesting >> to see where references to the missing symbols appear / vanish - just look >> at all intermediate files generated. >> >> Richard. > > This is interesting, there seem to be two different variables at play > here. __gcc_personality_v0 and __gxx_personality_v0. When I compile > with '-flto -O2' the error I get is about __gcc_personality_v0. When I > look at the two assembly files created during this compililation I see: > > ccG1Elhg.ltrans0.s: .global __gcc_personality_v0# > ccG1Elhg.ltrans0.s: .type __gcc_personality_v0#, @function > ccG1Elhg.ltrans0.s: .personality __gcc_personality_v0# > pr33572.s: stringz "\0014__gxx_personality_v0" > pr33572.s: .global __gxx_personality_v0# > pr33572.s: .type __gxx_personality_v0#, @function > pr33572.s: .personality __gxx_personality_v0# > > When I add -flto-partition=none to the compilation, I do not get the > ltrans file and I do not get any reference to __gcc_personality_v0. > > I don't think GCC has a __gcc_personality_v0 function, does it? This is > probably why the linker is complaining, if you declare a function as > external the HP linker will complain even if there are no uses of that > function. I think the GNU linker would ignore the external declaration > if there are no uses of it.
The gcc_personality is provided by libgcc_s I think, it's what you get when compiling C code with -fexceptions and install cleanup handlers. It seems that LTO comes to the conclusion that the C++ specific personality is not necessary but the generic one suffices. But that should still be provided by the original link libraries. Richard. > > Steve Ellcey > s...@cup.hp.com > > > >
