add 'include keyboard_features.mk' into build_keyboard.mk (#8422)
* add 'include keyboard_features.mk' into build_keyboard.mk keyboard_features.mk is a keyboard-local version of the functions performed by common_features.mk. * add comment into build_keyboard.mk * added description of keyboard_features.mk in hardware_keyboard_guidelines.md. * rename `keyboard_features.mk` to `post_rules.mk`
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@ -144,10 +144,38 @@ The `rules.mk` file can also be placed in a sub-folder, and its reading order is
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* `keyboards/top_folder/sub_1/sub_2/sub_3/sub_4/rules.mk`
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* `keyboards/top_folder/keymaps/a_keymap/rules.mk`
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* `users/a_user_folder/rules.mk`
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* `keyboards/top_folder/sub_1/sub_2/sub_3/sub_4/post_rules.mk`
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* `keyboards/top_folder/sub_1/sub_2/sub_3/post_rules.mk`
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* `keyboards/top_folder/sub_1/sub_2/post_rules.mk`
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* `keyboards/top_folder/sub_1/post_rules.mk`
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* `keyboards/top_folder/post_rules.mk`
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* `common_features.mk`
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Many of the settings written in the `rules.mk` file are interpreted by `common_features.mk`, which sets the necessary source files and compiler options.
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The `post_rules.mk` file can interpret `features` of a keyboard-level before `common_features.mk`. For example, when your designed keyboard has the option to implement backlighting or underglow using rgblight.c, writing the following in the `post_rules.mk` makes it easier for the user to configure the `rules.mk`.
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* `keyboards/top_folder/keymaps/a_keymap/rules.mk`
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```makefile
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# Please set the following according to the selection of the hardware implementation option.
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RGBLED_OPTION_TYPE = backlight ## none, backlight or underglow
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```
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* `keyboards/top_folder/post_rules.mk`
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```makefile
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ifeq ($(filter $(strip $(RGBLED_OPTION_TYPE))x, nonex backlightx underglowx x),)
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$(error unknown RGBLED_OPTION_TYPE value "$(RGBLED_OPTION_TYPE)")
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endif
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ifeq ($(strip $(RGBLED_OPTION_TYPE)),backlight)
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RGBLIGHT_ENABLE = yes
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OPT_DEFS += -DRGBLED_NUM=30
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endif
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ifeq ($(strip $(RGBLED_OPTION_TYPE)),underglow)
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RGBLIGHT_ENABLE = yes
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OPT_DEFS += -DRGBLED_NUM=6
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endif
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```
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?> See `build_keyboard.mk` and `common_features.mk` for more details.
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### `<keyboard_name.c>`
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