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avr-gcc -mmcu=attiny84 -Wall -Os -o i2c-spi-bridge.elf main.c USI_TWI_Slave.c SoftSPI.c SoftwareSerial.c
USI_TWI_Slave.c: In function 'usiTwiTransmitByte':
USI_TWI_Slave.c:196:13: warning: unused variable 'tmphead' [-Wunused-variable]
  196 |     uint8_t tmphead;
      |             ^~~~~~~
SoftwareSerial.c: In function 'softSerialBegin':
SoftwareSerial.c:302:27: warning: comparison of constant '255' with boolean expression is always false [-Wbool-compare]
  302 |   if ( ! error && ! rxpin == SOFTWARE_SERIAL_RX_DISABLED )
      |                           ^~
SoftwareSerial.c:302:27: warning: logical not is only applied to the left hand side of comparison [-Wlogical-not-parentheses]
SoftwareSerial.c:302:19: note: add parentheses around left hand side expression to silence this warning
  302 |   if ( ! error && ! rxpin == SOFTWARE_SERIAL_RX_DISABLED )
      |                   ^~~~~~~
      |                   (      )
/usr/bin/avr-ld: /tmp/cc17Mj8z.o:(.bss+0x0): multiple definition of `usi_onReceiverPtr'; /tmp/ccr2v1aC.o:(.bss+0x82): first defined here
/usr/bin/avr-ld: /tmp/cc17Mj8z.o:(.bss+0x2): multiple definition of `usi_onRequestPtr'; /tmp/ccr2v1aC.o:(.bss+0x84): first defined here
/usr/bin/avr-ld: /tmp/cc17Mj8z.o:(.bss+0x4): multiple definition of `_onTwiDataRequest'; /tmp/ccr2v1aC.o:(.bss+0x86): first defined here
/usr/bin/avr-ld: /tmp/ccfRN7Qx.o:(.bss+0x2): multiple definition of `_mosi'; /tmp/ccr2v1aC.o:(.bss+0x8a): first defined here
/usr/bin/avr-ld: /tmp/ccfRN7Qx.o:(.bss+0x3): multiple definition of `_miso'; /tmp/ccr2v1aC.o:(.bss+0x8b): first defined here
/usr/bin/avr-ld: /tmp/ccfRN7Qx.o:(.bss+0x1): multiple definition of `_sck'; /tmp/ccr2v1aC.o:(.bss+0x89): first defined here
/usr/bin/avr-ld: /tmp/ccfRN7Qx.o:(.bss+0x4): multiple definition of `_delay'; /tmp/ccr2v1aC.o:(.bss+0x8c): first defined here
/usr/bin/avr-ld: /tmp/ccfRN7Qx.o:(.bss+0x6): multiple definition of `_cke'; /tmp/ccr2v1aC.o:(.bss+0x8e): first defined here
/usr/bin/avr-ld: /tmp/ccfRN7Qx.o:(.bss+0x5): multiple definition of `_ckp'; /tmp/ccr2v1aC.o:(.bss+0x8d): first defined here
/usr/bin/avr-ld: /tmp/ccfRN7Qx.o:(.bss+0x0): multiple definition of `_order'; /tmp/ccr2v1aC.o:(.bss+0x88): first defined here
collect2: error: ld returned 1 exit status
make: *** [Makefile:5: all] Error 1