On Tue, Jan 2, 2024 at 1:09 PM Richard W.M. Jones <rjo...@redhat.com> wrote: > > > I'm not sure exactly the effect on RISC-V binaries, but I wanted to > raise it here to get the attention of the Fedora toolchain team ... > > Here's the bug: > > https://sourceware.org/bugzilla/show_bug.cgi?id=31179 > RISC-V: The SET/ADD/SUB fix breaks ABI compatibility with 2.41 objects > > It refers to this change in binutils 2.41: > > https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=73d931e560059a87d76f528fafbb4270a98746bc > > As far as I understand the issue (which is not too far) this mainly > affects shipped *.o and *.a files (ie. static libraries and similar) > which were compiled with binutils < 2.41, which either won't link > correctly or will give a linker error when using GNU ld from binutils 2.41.
Correction. This is broken in <= 2.41 (incl. the current stable binutils release). > > Unclear if it also affects *.so files (which would be a much more > serious ABI break), and also if it affects most binaries or just a > few. I initially thought this only affected programs using 128 bit > ints, so didn't think it was too important, but after reading the > commit I'm not sure that is really true. Nelson Chu committed (5 days ago) a change: https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=73d931e560059a87d76f528fafbb4270a98746bc This will accept whatever is produced by <= 2.41 and the final binary will be correct. There is also a new ld flag (--check-uleb128) which can produce a warning if it detects an issue. I plan/hope to use binutils 2.42 in Fedora/RISCV 40. That would happen before I start mass rebuilding, and that should fix this. > > There's been discussion about adding an ELF tag, but that seems very > problematic to me: > https://github.com/riscv-non-isa/riscv-elf-psabi-doc/pull/414 Yeah. I doubt we need a tag. I don't think it solves anything. Nelson commit (i.e. workaround) + mass rebuild should resolve any inconveniences AFAIK. Cheers, david > > Rich. > > -- > Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones > Read my programming and virtualization blog: http://rwmj.wordpress.com > virt-p2v converts physical machines to virtual machines. Boot with a > live CD or over the network (PXE) and turn machines into KVM guests. > http://libguestfs.org/virt-v2v > -- > _______________________________________________ > devel mailing list -- devel@lists.fedoraproject.org > To unsubscribe send an email to devel-le...@lists.fedoraproject.org > Fedora Code of Conduct: > https://docs.fedoraproject.org/en-US/project/code-of-conduct/ > List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines > List Archives: > https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org > Do not reply to spam, report it: > https://pagure.io/fedora-infrastructure/new_issue -- _______________________________________________ devel mailing list -- devel@lists.fedoraproject.org To unsubscribe send an email to devel-le...@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue
