[Bug 2116120] [NEW] Add support for RISC-V supm extension mandated by RVA23

[Heinrich Schuchardt]

Public bug reported:

The upstream gcc-15 compiler does not support -mach with extension supm
for pointer masking.

Extension supm is mandated by the RVA23U64 profile.

Upstream patch
7e5f5fd101f8 ("RISC-V: Minimal support for ssnpm, smnpm and smmpm extensions.")
is enough to accept extension supm in the -march parameter.

Please, add the patch to our gcc-15.

** Affects: gcc-15 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2116120

Title:
  Add support for RISC-V supm extension mandated by RVA23

Status in gcc-15 package in Ubuntu:
  New

Bug description:
  The upstream gcc-15 compiler does not support -mach with extension
  supm for pointer masking.

  Extension supm is mandated by the RVA23U64 profile.

  Upstream patch
  7e5f5fd101f8 ("RISC-V: Minimal support for ssnpm, smnpm and smmpm extensions.")
  is enough to accept extension supm in the -march parameter.

  Please, add the patch to our gcc-15.

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