[Bug target/121538] New: RISC-V: Self tests broken for RV32EC with r16-3028-g0c517ddf9b136c

[dimitar at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121538

            Bug ID: 121538
           Summary: RISC-V:  Self tests broken for RV32EC with
                    r16-3028-g0c517ddf9b136c
           Product: gcc
           Version: 16.0
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dimitar at gcc dot gnu.org
  Target Milestone: ---

Starting with r16-3028-g0c517ddf9b136c, GCC self tests are broken for RV32EC
with build error:

  cc1: error: ILP32E ABI does not support the 'D' extension

Toolchain was configured with:
   --target=riscv32-none-elf --with-multilib-generator=rv32ec-ilp32e--
--with-abi=ilp32e --with-arch=rv32ec

The script erroneously adds 'd' extension, even though it is not supported by
rv32ec:
$ ./config/riscv/arch-canonicalize rv32ec
rv32efdc_zicsr_zca_zcd_zcf

Before r16-3028-g0c517ddf9b136c the command returned:
$ ./config/riscv/arch-canonicalize rv32ec
rv32ec