PATCH: PR target/39472: Add -mabi=[ms|sysv]

[Kai Tietz]

Hallo H.J,

this patch looks fine to me, beside these three junks

> @@ -2740,7 +2757,7 @@ override_options (bool main_args_p)
>         use of rip-relative addressing.  This eliminates fixups that
>         would otherwise be needed if this object is to be placed in a
>         DLL, and is essentially just as efficient as direct addressing.  */
> -      if (TARGET_64BIT && DEFAULT_ABI == MS_ABI)
> +      if (TARGET_64BIT && ix86_abi == MS_ABI)
>        ix86_cmodel = CM_SMALL_PIC, flag_pic = 1;
>       else if (TARGET_64BIT)
>        ix86_cmodel = flag_pic ? CM_SMALL_PIC : CM_SMALL;

Do you want really to modify by this switch to pic mode and small
model for linux64?

> @@ -10096,7 +10115,7 @@ output_pic_addr_const (FILE *file, rtx x
>  #endif
>          assemble_name (file, name);
>        }
> -      if (!TARGET_MACHO && !(TARGET_64BIT && DEFAULT_ABI == MS_ABI)
> +      if (!TARGET_MACHO && !(TARGET_64BIT && ix86_abi == MS_ABI)
>          && code == 'P' && ! SYMBOL_REF_LOCAL_P (x))
>        fputs ("@PLT", file);
>       break;

This looks wrong to me, because for coff targets you never can emit @PLT.

> @@ -26683,7 +26702,7 @@ x86_function_profiler (FILE *file, int l
>       fprintf (file, "\tleaq\t%sP%d@(%%rip),%%r11\n", LPREFIX, labelno);
>  #endif
>
> -      if (DEFAULT_ABI == SYSV_ABI && flag_pic)
> +      if (ix86_abi == SYSV_ABI && flag_pic)
>        fprintf (file, "\tcall\t*%s@GOTPCREL(%%rip)\n", MCOUNT_NAME);
>       else
>        fprintf (file, "\tcall\t%s\n", MCOUNT_NAME);

the same here, pep-coff do not have really a GOTPCREL.
By this I would check here DEFAULT_ABI, because it is the targets
default and can be used to decide if @PLT and @GOTPCREL are present.

Cheers,
Kai

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