LD: nuttx
/usr/local/opt/arm-none-eabi-binutils/bin/arm-none-eabi-ld: sam_start.o (symbol from plugin): in function `__start':
(.text+0x0): multiple definition of `__start'; crt0.o (symbol from plugin):(.text+0x0): first defined here
lto-wrapper: warning: Extra option to '-Xassembler': -mthumb, dropping all '-Xassembler' and '-Wa' options.
chip/sam_start.c:153:6: warning: type of '__start' does not match original declaration [-Wlto-type-mismatch]
  153 | void __start(void)
      |      ^
common/crt0.c:163:6: note: type mismatch in parameter 1
  163 | void __start(int argc, char *argv[])
      |      ^
common/crt0.c:163:6: note: type 'int' should match type 'void'
common/crt0.c:163:6: note: '__start' was previously declared here
/usr/local/opt/arm-none-eabi-binutils/bin/arm-none-eabi-ld: /var/folders/6l/6br4bshn12x2s8hjfqsqjt5c0000gn/T//ccQe8Sts.ltrans0.ltrans.o: in function `__assert.constprop.0':
<artificial>:(.text.__assert.constprop.0+0x284): undefined reference to `memset'
/usr/local/opt/arm-none-eabi-binutils/bin/arm-none-eabi-ld: (memset): Unknown destination type (ARM/Thumb) in /var/folders/6l/6br4bshn12x2s8hjfqsqjt5c0000gn/T//ccQe8Sts.ltrans0.ltrans.o
<artificial>:(.text.__assert.constprop.0+0x284): dangerous relocation: unsupported relocation
/usr/local/opt/arm-none-eabi-binutils/bin/arm-none-eabi-ld: /var/folders/6l/6br4bshn12x2s8hjfqsqjt5c0000gn/T//ccQe8Sts.ltrans0.ltrans.o: in function `__start':
<artificial>:(.text.__start+0x1c): undefined reference to `main'
Memory region         Used Size  Region Size  %age Used
arch/arm/samv7: optimize MCUboot loader configuration
           flash:        7560 B       144 KB      5.13%
            sram:        2560 B       384 KB      0.65%
collect2: error: ld returned 1 exit status
make[1]: *** [nuttx] Error 1
make: *** [nuttx] Error 2