/tmp/ccM9YNP6.o: In function `main':
foo.cc:(.text.startup+0x5): relocation truncated to fit: R_X86_64_32 against symbol `N' defined in .bss section in /tmp/ccM9YNP6.o
foo.cc:(.text.startup+0x16): relocation truncated to fit: R_X86_64_32 against symbol `A' defined in .bss section in /tmp/ccM9YNP6.o
foo.cc:(.text.startup+0x2b): relocation truncated to fit: R_X86_64_PC32 against symbol `N' defined in .bss section in /tmp/ccM9YNP6.o
foo.cc:(.text.startup+0x60): relocation truncated to fit: R_X86_64_PC32 against symbol `N' defined in .bss section in /tmp/ccM9YNP6.o
/tmp/ccM9YNP6.o: In function `_GLOBAL__sub_I_N':
foo.cc:(.text.startup+0x1b5): relocation truncated to fit: R_X86_64_32 against `.bss'
foo.cc:(.text.startup+0x1c4): relocation truncated to fit: R_X86_64_32 against `.bss'
collect2: error: ld returned 1 exit status

自豪的采用 HydroJudge 进行评测(github.com/hydro-dev/HydroJudge)