[Bug gas/28372] [RISCV] wrong attribute of version number generated for p extension

[cooper.qu at linux dot alibaba.com]

https://sourceware.org/bugzilla/show_bug.cgi?id=28372

--- Comment #1 from Cooper Qu <cooper.qu at linux dot alibaba.com> ---
I think the problem is the assembler cannot identify whether the 'p' represents
a extension or a version number. So it's not a bug and the option should be
written as:
  -march=rv64imac_p9p3

But there is a bug when I specify a default version for p extension in
riscv_supported_std_ext[](elfxx-riscv.c). Then, if I assemble with
-march=rv32imacp, the attribute is:
    Attribute Section: riscv
    File Attributes
      Tag_RISCV_arch: "rv64i2p0_m2p0_a2p0_c0p0_p0p9"

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