God, I so badly want to add some defines to the io headers in my next version of compiler package...

[SpenceKonde]

It's just a few regex operations.....

find:
(.*\ntypedef.*enum|.*_gc.*|/\*\n-*\n.*\n-*\n\*/)
"find all" ctrl+c ctrl+n ctrl+v

replace
typedef.*\n with `` (empty string)
replace all

replace
*(.*)_gc = (\(.*\)), with #define \1_GC \2

Yields sections that look like:

/*
--------------------------------------------------------------------------
AC - Analog Comparator
--------------------------------------------------------------------------
*/
/* Hysteresis Mode select */
#define AC_HYSMODE_NONE_GC   (0x00<<1)   /* No hysteresis */
#define AC_HYSMODE_SMALL_GC   (0x01<<1)   /* Small hysteresis */
#define AC_HYSMODE_MEDIUM_GC   (0x02<<1)   /* Medium hysteresis */
#define AC_HYSMODE_LARGE_GC   (0x03<<1)   /* Large hysteresis */
/* AC Output Initial Value select */
#define AC_INITVAL_LOW_GC   (0x00<<6)   /* Output initialized to 0 */
#define AC_INITVAL_HIGH_GC   (0x01<<6)   /* Output initialized to 1 */
/* Interrupt Mode select */
#define AC_INTMODE_ABOVE_GC   (0x00<<4)   /* Entering window state above */
#define AC_INTMODE_INSIDE_GC   (0x01<<4)   /* Entering window state inside */
#define AC_INTMODE_BELOW_GC   (0x02<<4)   /* Entering window state below */
#define AC_INTMODE_OUTSIDE_GC   (0x03<<4)   /* Entering window state above or below */
/* Negative Input MUX Selection select */
#define AC_MUXNEG_AINN0_GC   (0x00<<0)   /* Negative Pin 0 */
#define AC_MUXNEG_AINN1_GC   (0x01<<0)   /* Negative Pin 1 */
#define AC_MUXNEG_AINN2_GC   (0x02<<0)   /* Negative Pin 2 */
#define AC_MUXNEG_DACREF_GC   (0x03<<0)   /* DAC Reference */
/* Positive Input MUX Selection select */
#define AC_MUXPOS_AINP0_GC   (0x00<<3)   /* Positive Pin 0 */
#define AC_MUXPOS_AINP1_GC   (0x01<<3)   /* Positive Pin 1 */
#define AC_MUXPOS_AINP2_GC   (0x02<<3)   /* Positive Pin 2 */
#define AC_MUXPOS_AINP3_GC   (0x03<<3)   /* Positive Pin 3 */
/* Power profile select */
#define AC_POWER_PROFILE0_GC   (0x00<<3)   /* Power profile 0, lowest consumption and highest response time. */
#define AC_POWER_PROFILE1_GC   (0x01<<3)   /* Power profile 1 */
#define AC_POWER_PROFILE2_GC   (0x02<<3)   /* Power profile 2 */
#define AC_POWER_PROFILE3_GC   (0x03<<3)   /* Power profile 3 */
/* Window selection mode select */
#define AC_WINSEL_DISABLED_GC   (0x00<<0)   /* Window function disabled */
#define AC_WINSEL_UPSEL1_GC   (0x01<<0)   /* Select ACn+1 as upper limit in window compare. */
#define AC_WINSEL_UPSEL2_GC   (0x02<<0)   /* Select ACn+2 as upper limit in window compare. */
/* Analog Comparator Window State select */
#define AC_WINSTATE_ABOVE_GC   (0x00<<6)   /* Above window */
#define AC_WINSTATE_INSIDE_GC   (0x01<<6)   /* Inside window */
#define AC_WINSTATE_BELOW_GC   (0x02<<6)   /* Below window */

Then copy-paste the 1500-some lines of that (for AVR DA) onto the bottom of the i/o header

Why? So that you can use group codes in #if preprocessor macros!

[SpenceKonde]

Maybe it would be better to make an ioaddendum.h, that pulls n a sepaate fle for each part with those defnes in it, and package that with the core, and jst have Arduino.h pull that ni afte io.h....