[Bug] avr-gcc/arm-none-eabi-gcc 10 issues

[zvecr]

Describe the Bug

Due to the vast number of issues that seem to be fallout from the recent release, this issue aims to track some of the known issues while they are being worked on. Any potential workarounds or mitigation actions will be added when that detail is available.

multiple definition of `x'; - #9269, #9267

Fixed

Linking: .build/ai03_orbit_default.elf                                                              [ERRORS]
 | 
 | /usr/bin/avr-ld: .build/obj_ai03_orbit_default/keyboards/ai03/orbit/orbit.o:/home/zvecr/qmk_firmware/keyboards/ai03/orbit/orbit.h:59: multiple definition of `current_layer'; .build/obj_ai03_orbit_default/transport.o:/home/zvecr/qmk_firmware/keyboards/ai03/orbit/orbit.h:59: first defined here
 | /usr/bin/avr-ld: .build/obj_ai03_orbit_default/keyboards/ai03/orbit/keymaps/default/keymap.o:/home/zvecr/qmk_firmware/keyboards/ai03/orbit/orbit.h:59: multiple definition of `current_layer'; .build/obj_ai03_orbit_default/transport.o:/home/zvecr/qmk_firmware/keyboards/ai03/orbit/orbit.h:59: first defined here
 | collect2: error: ld returned 1 exit status
 |

LTO - #15115

Fixed

Making lets_split/sockets with keymap default                                                          [WARNINGS]
 | 
 | lto-wrapper: warning: Options to Xassembler do not match: -adhlns=.build/obj_lets_split_sockets_default/keyboards/lets_split/lets_split.lst, -adhlns=.build/obj_lets_split_sockets_default/keyboards/lets_split/sockets/sockets.lst, dropping all -Xassembler and -Wa options.
 |

Teensy eeprom - #12587

Fixed

Making handwired/onekey/teensy_lc with keymap default                                                  [ERRORS]
tmk_core/common/chibios/eeprom_teensy.c: In function 'eeprom_initialize':
tmk_core/common/chibios/eeprom_teensy.c:366:71: error: array subscript 0 is outside array bounds of 'uint32_t[1]' {aka 'long unsigned int[1]'} [-Werror=array-bounds]
  366 |     flashend = (uint32_t)((uint16_t *)SYMVAL(__eeprom_workarea_end__) - 1);
      |                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~
tmk_core/common/chibios/eeprom_teensy.c:351:17: note: while referencing '__eeprom_workarea_end__'
  351 | extern uint32_t __eeprom_workarea_end__;
      |                 ^~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
 | 
 | 
 | 

TWI lib - #9273

Fixed

Making meira/promicro with keymap default                                                              [ERRORS]
 | 
 | /usr/bin/avr-ld: .build/obj_meira_promicro_default/keyboards/meira/meira.o:/home/zvecr/qmk_firmware/keyboards/meira/TWIlib.h:45: multiple definition of `TWIInfo'; .build/obj_meira_promicro_default/TWIlib.o:/home/zvecr/qmk_firmware/keyboards/meira/TWIlib.h:45: first defined here
 | /usr/bin/avr-ld: .build/obj_meira_promicro_default/keyboards/meira/meira.o:/home/zvecr/qmk_firmware/keyboards/meira/TWIlib.h:28: multiple definition of `RXBuffLen'; .build/obj_meira_promicro_default/TWIlib.o:/home/zvecr/qmk_firmware/keyboards/meira/TWIlib.h:28: first defined here
 | /usr/bin/avr-ld: .build/obj_meira_promicro_default/keyboards/meira/meira.o:/home/zvecr/qmk_firmware/keyboards/meira/TWIlib.h:27: multiple definition of `TXBuffLen'; .build/obj_meira_promicro_default/TWIlib.o:/home/zvecr/qmk_firmware/keyboards/meira/TWIlib.h:27: first defined here
 | /usr/bin/avr-ld: .build/obj_meira_promicro_default/keyboards/meira/meira.o:/home/zvecr/qmk_firmware/keyboards/meira/TWIlib.h:25: multiple definition of `RXBuffIndex'; .build/obj_meira_promicro_default/TWIlib.o:/home/zvecr/qmk_firmware/keyboards/meira/TWIlib.h:25: first defined here
 | /usr/bin/avr-ld: .build/obj_meira_promicro_default/keyboards/meira/meira.o:/home/zvecr/qmk_firmware/keyboards/meira/TWIlib.h:24: multiple definition of `TXBuffIndex'; .build/obj_meira_promicro_default/TWIlib.o:/home/zvecr/qmk_firmware/keyboards/meira/TWIlib.h:24: first defined here
 | /usr/bin/avr-ld: .build/obj_meira_promicro_default/keyboards/meira/meira.o:/home/zvecr/qmk_firmware/keyboards/meira/TWIlib.h:22: multiple definition of `TWIReceiveBuffer'; .build/obj_meira_promicro_default/TWIlib.o:/home/zvecr/qmk_firmware/keyboards/meira/TWIlib.h:22: first defined here
 | /usr/bin/avr-ld: .build/obj_meira_promicro_default/keyboards/meira/meira.o:/home/zvecr/qmk_firmware/keyboards/meira/TWIlib.h:20: multiple definition of `TWITransmitBuffer'; .build/obj_meira_promicro_default/TWIlib.o:/home/zvecr/qmk_firmware/keyboards/meira/TWIlib.h:20: first defined here
 | collect2: error: ld returned 1 exit status

Drop alt/ctrl

i2c - #9485

Fixed

Making massdrop/ctrl with keymap default                                                               [ERRORS]
 | 
 | /usr/lib/gcc/arm-none-eabi/10.1.0/../../../../arm-none-eabi/bin/ld: .build/obj_massdrop_ctrl_default/config_led.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:28: multiple definition of `dmac_desc_wb'; .build/obj_massdrop_ctrl_default/matrix.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:28: first defined here
 | /usr/lib/gcc/arm-none-eabi/10.1.0/../../../../arm-none-eabi/bin/ld: .build/obj_massdrop_ctrl_default/config_led.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:27: multiple definition of `dmac_desc'; .build/obj_massdrop_ctrl_default/matrix.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:27: first defined here
 | /usr/lib/gcc/arm-none-eabi/10.1.0/../../../../arm-none-eabi/bin/ld: .build/obj_massdrop_ctrl_default/keyboards/massdrop/ctrl/keymaps/default/keymap.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:28: multiple definition of `dmac_desc_wb'; .build/obj_massdrop_ctrl_default/matrix.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:28: first defined here
 | /usr/lib/gcc/arm-none-eabi/10.1.0/../../../../arm-none-eabi/bin/ld: .build/obj_massdrop_ctrl_default/keyboards/massdrop/ctrl/keymaps/default/keymap.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:27: multiple definition of `dmac_desc'; .build/obj_massdrop_ctrl_default/matrix.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:27: first defined here
 | /usr/lib/gcc/arm-none-eabi/10.1.0/../../../../arm-none-eabi/bin/ld: .build/obj_massdrop_ctrl_default/common/arm_atsam/suspend.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:28: multiple definition of `dmac_desc_wb'; .build/obj_massdrop_ctrl_default/matrix.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:28: first defined here
 | /usr/lib/gcc/arm-none-eabi/10.1.0/../../../../arm-none-eabi/bin/ld: .build/obj_massdrop_ctrl_default/common/arm_atsam/suspend.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:27: multiple definition of `dmac_desc'; .build/obj_massdrop_ctrl_default/matrix.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:27: first defined here
 | /usr/lib/gcc/arm-none-eabi/10.1.0/../../../../arm-none-eabi/bin/ld: .build/obj_massdrop_ctrl_default/common/magic.o:/home/zvecr/qmk_firmware/quantum/keycode_config.h:44: multiple definition of `keymap_config'; .build/obj_massdrop_ctrl_default/keyboards/massdrop/ctrl/keymaps/default/keymap.o:(.bss+0x4): first defined here
 | /usr/lib/gcc/arm-none-eabi/10.1.0/../../../../arm-none-eabi/bin/ld: .build/obj_massdrop_ctrl_default/protocol/arm_atsam/adc.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:28: multiple definition of `dmac_desc_wb'; .build/obj_massdrop_ctrl_default/matrix.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:28: first defined here
 | /usr/lib/gcc/arm-none-eabi/10.1.0/../../../../arm-none-eabi/bin/ld: .build/obj_massdrop_ctrl_default/protocol/arm_atsam/adc.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:27: multiple definition of `dmac_desc'; .build/obj_massdrop_ctrl_default/matrix.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:27: first defined here
 | /usr/lib/gcc/arm-none-eabi/10.1.0/../../../../arm-none-eabi/bin/ld: .build/obj_massdrop_ctrl_default/protocol/arm_atsam/clks.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:28: multiple definition of `dmac_desc_wb'; .build/obj_massdrop_ctrl_default/matrix.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:28: first defined here
 | /usr/lib/gcc/arm-none-eabi/10.1.0/../../../../arm-none-eabi/bin/ld: .build/obj_massdrop_ctrl_default/protocol/arm_atsam/clks.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:27: multiple definition of `dmac_desc'; .build/obj_massdrop_ctrl_default/matrix.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:27: first defined here
 | /usr/lib/gcc/arm-none-eabi/10.1.0/../../../../arm-none-eabi/bin/ld: .build/obj_massdrop_ctrl_default/protocol/arm_atsam/i2c_master.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:28: multiple definition of `dmac_desc_wb'; .build/obj_massdrop_ctrl_default/matrix.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:28: first defined here
 | /usr/lib/gcc/arm-none-eabi/10.1.0/../../../../arm-none-eabi/bin/ld: .build/obj_massdrop_ctrl_default/protocol/arm_atsam/i2c_master.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:27: multiple definition of `dmac_desc'; .build/obj_massdrop_ctrl_default/matrix.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:27: first defined here
 | /usr/lib/gcc/arm-none-eabi/10.1.0/../../../../arm-none-eabi/bin/ld: .build/obj_massdrop_ctrl_default/protocol/arm_atsam/led_matrix.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:28: multiple definition of `dmac_desc_wb'; .build/obj_massdrop_ctrl_default/matrix.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:28: first defined here
 | /usr/lib/gcc/arm-none-eabi/10.1.0/../../../../arm-none-eabi/bin/ld: .build/obj_massdrop_ctrl_default/protocol/arm_atsam/led_matrix.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:27: multiple definition of `dmac_desc'; .build/obj_massdrop_ctrl_default/matrix.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:27: first defined here
 | /usr/lib/gcc/arm-none-eabi/10.1.0/../../../../arm-none-eabi/bin/ld: .build/obj_massdrop_ctrl_default/protocol/arm_atsam/main_arm_atsam.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:28: multiple definition of `dmac_desc_wb'; .build/obj_massdrop_ctrl_default/matrix.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:28: first defined here
 | /usr/lib/gcc/arm-none-eabi/10.1.0/../../../../arm-none-eabi/bin/ld: .build/obj_massdrop_ctrl_default/protocol/arm_atsam/main_arm_atsam.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:27: multiple definition of `dmac_desc'; .build/obj_massdrop_ctrl_default/matrix.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:27: first defined here
 | /usr/lib/gcc/arm-none-eabi/10.1.0/../../../../arm-none-eabi/bin/ld: .build/obj_massdrop_ctrl_default/protocol/arm_atsam/spi.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:28: multiple definition of `dmac_desc_wb'; .build/obj_massdrop_ctrl_default/matrix.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:28: first defined here
 | /usr/lib/gcc/arm-none-eabi/10.1.0/../../../../arm-none-eabi/bin/ld: .build/obj_massdrop_ctrl_default/protocol/arm_atsam/spi.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:27: multiple definition of `dmac_desc'; .build/obj_massdrop_ctrl_default/matrix.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:27: first defined here
 | /usr/lib/gcc/arm-none-eabi/10.1.0/../../../../arm-none-eabi/bin/ld: .build/obj_massdrop_ctrl_default/protocol/arm_atsam/usb/usb2422.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:28: multiple definition of `dmac_desc_wb'; .build/obj_massdrop_ctrl_default/matrix.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:28: first defined here
 | /usr/lib/gcc/arm-none-eabi/10.1.0/../../../../arm-none-eabi/bin/ld: .build/obj_massdrop_ctrl_default/protocol/arm_atsam/usb/usb2422.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:27: multiple definition of `dmac_desc'; .build/obj_massdrop_ctrl_default/matrix.o:/home/zvecr/qmk_firmware/tmk_core/protocol/arm_atsam/i2c_master.h:27: first defined here
 | collect2: error: ld returned 1 exit status
 | 

keymap_config - #12058

Fixed

Linking: .build/massdrop_ctrl_default.elf                                                           [ERRORS]
 | 
 | /usr/lib/gcc/arm-none-eabi/10.2.0/../../../../arm-none-eabi/bin/ld: .build/obj_massdrop_ctrl_default/common/magic.o:/home/zvecr/qmk_firmware/tmk_core/common/magic.c:15: multiple definition of `keymap_config'; .build/obj_massdrop_ctrl_default/keyboards/massdrop/ctrl/keymaps/default/keymap.o:/home/zvecr/qmk_firmware/keyboards/massdrop/ctrl/keymaps/default/keymap.c:13: first defined here
 | collect2: error: ld returned 1 exit status