/tmp/ccLb7mTd.o: In function `main':
foo.cc:(.text.startup+0x12): relocation truncated to fit: R_X86_64_PC32 against symbol `n' defined in .bss section in /tmp/ccLb7mTd.o
foo.cc:(.text.startup+0x24): relocation truncated to fit: R_X86_64_PC32 against symbol `n' defined in .bss section in /tmp/ccLb7mTd.o
foo.cc:(.text.startup+0x33): relocation truncated to fit: R_X86_64_PC32 against symbol `a' defined in .bss section in /tmp/ccLb7mTd.o
foo.cc:(.text.startup+0x72): relocation truncated to fit: R_X86_64_PC32 against symbol `n' defined in .bss section in /tmp/ccLb7mTd.o
/tmp/ccLb7mTd.o: In function `_GLOBAL__sub_I_n':
foo.cc:(.text.startup+0x1a3): relocation truncated to fit: R_X86_64_PC32 against `.bss'
foo.cc:(.text.startup+0x1c1): relocation truncated to fit: R_X86_64_PC32 against `.bss'
collect2: error: ld returned 1 exit status