Re: [RISCV] RISC-V GNU Toolchain Biweekly Sync-up call (Jan 27, 2022)
David Abdurachmanov via Gcc <[email protected]>
| Newsgroups | gmane.comp.gcc.devel,gmane.comp.lib.glibc.alpha,gmane.comp.gdb.devel,gmane.comp.gnu.binutils |
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| Message-ID | <CAJCwxyANEp=vikG43jGoP7TZ2q2-QwtU8_pcGf7BmH8EsnL2kw@mail.gmail.com> |
On Thu, Jan 27, 2022 at 6:21 PM Matthias Klose <[email protected]> wrote: > On 1/26/22 14:04, [email protected] wrote: > > Hi all, > > > > There is an agenda for tomorrow's meeting. If you have topics to > > discuss or share, please let me know and I can add them to the agenda. > > > > Agenda: > > > > > > > > > > > > - Bump GCC default ISA spec and got bug report[1] for that. > > Tried to join the meeting, but it ended early apparently. > > Using in Debian and Ubuntu binutils 2.38, I see then with GCC 11.2 > warnings for > every link: > > /usr/bin/ld: warning: /usr/lib/gcc/riscv64-linux-gnu/10/crtn.o: > mis-matched ISA > version 2.0 for 'i' extension, the output version is 2.1 > /usr/bin/ld: warning: /usr/lib/gcc/riscv64-linux-gnu/10/crtn.o: > mis-matched ISA > version 2.0 for 'a' extension, the output version is 2.1 > /usr/bin/ld: warning: /usr/lib/gcc/riscv64-linux-gnu/10/crtn.o: > mis-matched ISA > version 2.0 for 'f' extension, the output version is 2.2 > /usr/bin/ld: warning: /usr/lib/gcc/riscv64-linux-gnu/10/crtn.o: > mis-matched ISA > version 2.0 for 'd' extension, the output version is 2.2 > > Are there any plans to backport the support for ISA 2.1/2.2 to GCC 11? Or > do we > need to configure binutils to use 2.0 until the compiler is changed to GCC > 12? > There are a few packages that will be broken (because they set -march assuming the old standard). Things like kernel (patch proposed), opensbi (patch proposed), u-boot, grub and similar. Kudos to Aurelien Jarno for sending these patches already. The warnings can be ignored here IIRC. The patch was proposed back in December: [PATCH 1/2] RISC-V: Don't report mismatch warnings when versions are larger than 1.0. https://sourceware.org/pipermail/binutils/2021-December/119060.html But it wasn't committed yet. The patch was part of the series to change default ISA to 20191213. IIUC all combinations: - GCC 12 + binutils 2.38 - GCC 11 + binutils 2.37 - GCC 12 + binutils 2.37 are valid, but you might want to use --with-isa-spec=2.2 for now until some of the packages are patched. Cheers, david > > There's also no documentation about that change, at least in binutils. > Should > that be mentioned in the release notes? > > Thanks, Matthias >