Summary: | RISC-V: -march=rv32imcb fails due to cannot find default versions of the ISA extension `b' | ||
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Product: | binutils | Reporter: | H. Peter Anvin <hpa> |
Component: | gas | Assignee: | Not yet assigned to anyone <unassigned> |
Status: | RESOLVED NOTABUG | ||
Severity: | normal | CC: | nelsonc1225, research_trasio |
Priority: | P2 | ||
Version: | 2.38 | ||
Target Milestone: | --- | ||
Host: | Target: | ||
Build: | Last reconfirmed: |
Description
H. Peter Anvin
2022-07-08 22:39:31 UTC
I think this is not a bug. Note that, 'B' will not be a single extension (at least for now) [1] but multiple extensions with 'Zb*' names are be defined and ratified. For instance, upcoming RVA22U64 profile [2] considers following extensions mandatory: - Zba (address computation) - Zbb (basic bit manipulation) - Zbs (single-bit fiddling) and following extensions unsupported optional: - Zbc (carry-less multiply) - Zbkb (crypto-related subextension) - Zbkc (crypto-related subextension) - Zbkx (crypto-related subextension) Try using those extensions instead. [1]: https://github.com/riscv/riscv-isa-manual/commit/c1c77c4902d5e7c58613d725d09d66a2a743da1c [2]: https://github.com/riscv/riscv-profiles/blob/main/profiles.adoc Consider this, https://github.com/bminor/binutils-gdb/commit/3a3e333f65483b864bf2624392f8aa4a88c7a498. Since the base b extension hasn't been ratified, so marked as RESOLVED and NOTABUG. |