/tmp/ccu2VrVw.o: in function `main':
foo.cc:(.text.startup+0x1b): relocation truncated to fit: R_X86_64_PC32 against symbol `a' defined in .bss section in /tmp/ccu2VrVw.o
foo.cc:(.text.startup+0x54): relocation truncated to fit: R_X86_64_PC32 against symbol `a' defined in .bss section in /tmp/ccu2VrVw.o
/tmp/ccu2VrVw.o: in function `_GLOBAL__sub_I_a':
foo.cc:(.text.startup+0x114): relocation truncated to fit: R_X86_64_PC32 against `.bss'
collect2: error: ld returned 1 exit status