https://sourceware.org/bugzilla/show_bug.cgi?id=29341
Bug ID: 29341
Summary: RISC-V: -march=rv32imcb fails
Product: binutils
Version: 2.38
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: gas
Assignee: unassigned at sourceware dot org
Reporter: hpa at zytor dot com
Target Milestone: ---
Specifying -march=rv32imcb (or any other combination that includes the "b"
extension) invariably causes the error message:
[hpa@tazenda tmp]$ riscv32-unknown-elf-as -march=rv32imcb -o b-ext.o b-ext.s
Assembler messages:
Error: cannot find default versions of the ISA extension `b'
b-ext.s:2: Error: unrecognized opcode `clz a0,a0'
... many more ...
Enumerating sub-extensions work:
riscv32-unknown-elf-as -march=rv32imc_zba_zbb_zbc_zbs -o b-ext.o b-ext.s
This is using b-ext.s from gas/testsuite/gas/riscv/b-ext.s as test case.
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