Missing "micromips" multilib option for mips*-elf target

[Hakurei Reimu]

Hello, I'm trying to build a toolchain for the Microchip PIC32MM MCU
using latest GCC 11.2. But it seems that there isn't a "micromips"
multilib option available. In this way I'm unable to compile libstdc++
and newlib for this platform.

Just like the ARM Cortex-M MCUs which only support the Thumb
instruction set, the PIC32MM only supports the micromips instruction
set (and not mips32).

I wonder if you can add all the possible combinations to the multilib
list for the mips*-elf target, just like the arm-*-eabi target.

Thank you very much.

odd internal failure

[Gary Oblock via Gcc]

What is happening should be trivial to determine but for some reason it's
not. I'd normally bounce this off a coworker but given the pandemic
and modern dispersed hiring practices it's not even remotely possible.

I'm making this call and tree_to_uhwi is failing on an internal error.
That's normally easy to fix, but here is where the weirdness kicks in.

  unsigned HOST_WIDE_INT wi_offset = tree_to_uhwi (offset);

tree_to_uhwi from tree.h is:

extern inline __attribute__ ((__gnu_inline__)) unsigned HOST_WIDE_INT
tree_to_uhwi (const_tree t)
{
  gcc_assert (tree_fits_uhwi_p (t));
  return TREE_INT_CST_LOW (t);
}

and

tree_fits_uhwi_p from tree.c is

bool
tree_fits_uhwi_p (const_tree t)
{
  return (t != NULL_TREE
 && TREE_CODE (t) == INTEGER_CST
 && wi::fits_uhwi_p (wi::to_widest (t)));
}

Here's what this instrumentation shows (DEBUG_A is an indenting fprintf to
stderr.)

  DEBUG_A ("TREE_CODE(offset) = %s  && ", code_str (TREE_CODE (offset)));
  DEBUG_A ("fits %s\n", wi::fits_uhwi_p (wi::to_widest (offset)) ? "true" : 
"false");
  DEBUG_A ("tree_fits_uhwi_p(offset) %s\n",tree_fits_uhwi_p (offset) ? "true" : 
"false");

   TREE_CODE(offset) = INTEGER_CST  && fits true
   tree_fits_uhwi_p(offset) true

By the way, offset is:

_Literal (struct BASKET * *) 8

And it's an operand of:

MEM[(struct BASKET * *)&perm + 8B]

Any clues on what's going on here?

Thanks,

Gary


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