Thanks for the report Eliot. In this case there's no need to file a bug report as we're about to produce a minor release of gem5 that will off LTO by default. I'm not familiar with this particular problem you are facing, but we've found we need to turn it off for other reasons (1. It increases links times for some users to unacceptable levels and 2. LTO strips debug symbols which you'll need if you want to run tools such as GDB).
I'm hoping we can ship the minor release sometime this week! -- Dr. Bobby R. Bruce Room 3050, Kemper Hall, UC Davis Davis, CA, 95616 web: https://www.bobbybruce.net On Mon, May 24, 2021 at 12:43 PM Eliot Moss via gem5-users < gem5-users@gem5.org> wrote: > Dear Gem5-ers: > > I have been trying to build Gem5 out of the box, for x86, on a VirtualBox > virtual machine set up for 64-bit Ubuntu 20.04 ("focal"). I can do > > scons build/X86/gem5.opt > > but it will succeed only if I disable link time optimization LTO using > --no-lto. I've tried various versions GCC - 7, 8, 9, and 10 - and all > produce the same result. (I think the key thing is probably something in > binutils, but I don't know what version to try to obtain, and this version > of > Ubuntu does not readily offer anything other than 2.34.) > > Searching the web about this general problem mostly produces the > "solution" of > disabling LTO. So, where should we / I file a bug report? By turning on > LTO > reporting, I have found that the proximal cause is that decoder.o does not > have a .debug_str section and yet there are a huge number of references to > things that should be there (labels, I guess - the decode *would* have a > lot > of those!). > > Regards - Eliot > _______________________________________________ > gem5-users mailing list -- gem5-users@gem5.org > To unsubscribe send an email to gem5-users-le...@gem5.org > %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s >
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