[Bug target/111093] New: [nvptx] ICE (assert) when running "accel/nvptx-none/cc1 -E -dM < /dev/null"

["burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111093

            Bug ID: 111093
           Summary: [nvptx] ICE (assert) when running
                    "accel/nvptx-none/cc1 -E -dM < /dev/null"
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: burnus at gcc dot gnu.org
                CC: tschwinge at gcc dot gnu.org, vries at gcc dot gnu.org
  Target Milestone: ---

Running "accel/nvptx-none/cc1 -E -dM < /dev/null" to determine which #defines
are available fails with:

cc1: internal compiler error: in nvptx_option_override, at
config/nvptx/nvptx.cc:339
0x125e31a nvptx_option_override


The reason is:

  /* Via nvptx 'OPTION_DEFAULT_SPECS', '-misa' always appears on the command
     line.  */
  gcc_checking_assert (OPTION_SET_P (ptx_isa_option));

Expected: An error message that '-misa=' is required, given that
OPTION_DEFAULT_SPECS is not used when invoking the compiler (e.g. cc1) directly
and not via the driver (e.g. gcc), especially as the drivers of the accelerator
targets are not installed in an offloading configuration.