/tmp/ccXl3ZD3.o: In function `main':
foo.cc:(.text.startup+0x18): relocation truncated to fit: R_X86_64_PC32 against symbol `n' defined in .bss section in /tmp/ccXl3ZD3.o
foo.cc:(.text.startup+0x40): relocation truncated to fit: R_X86_64_PC32 against symbol `n' defined in .bss section in /tmp/ccXl3ZD3.o
foo.cc:(.text.startup+0x4f): relocation truncated to fit: R_X86_64_PC32 against symbol `a' defined in .bss section in /tmp/ccXl3ZD3.o
foo.cc:(.text.startup+0x56): relocation truncated to fit: R_X86_64_PC32 against symbol `a' defined in .bss section in /tmp/ccXl3ZD3.o
foo.cc:(.text.startup+0x84): relocation truncated to fit: R_X86_64_PC32 against symbol `n' defined in .bss section in /tmp/ccXl3ZD3.o
foo.cc:(.text.startup+0xd3): relocation truncated to fit: R_X86_64_PC32 against symbol `a' defined in .bss section in /tmp/ccXl3ZD3.o
/tmp/ccXl3ZD3.o: In function `_GLOBAL__sub_I_n':
foo.cc:(.text.startup+0x1d3): relocation truncated to fit: R_X86_64_PC32 against `.bss'
foo.cc:(.text.startup+0x1f1): relocation truncated to fit: R_X86_64_PC32 against `.bss'
collect2: error: ld returned 1 exit status