Hi, I see .bss is of size 000004. I don't quite understand it. Since it is of type NOBITS, shouldn't it contains nothing? Why it is not of size zero? Thanks. $ cat foo.c int globalVar; $ gcc -c foo.c readelf -SW foo.o There are 9 section headers, starting at offset 0x180: Section Headers: [Nr] Name Type Address Off Size ES Flg Lk Inf Al [ 0] NULL 0000000000000000 000000 000000 00 0 0 0 [ 1] .text PROGBITS 0000000000000000 000040 000000 00 AX 0 0 1 [ 2] .data PROGBITS 0000000000000000 000040 000000 00 WA 0 0 1 [ 3] .bss NOBITS 0000000000000000 000040 000004 00 WA 0 0 4 [ 4] .comment PROGBITS 0000000000000000 000040 000028 01 MS 0 0 1 [ 5] .note.GNU-stack PROGBITS 0000000000000000 000068 000000 00 0 0 1 [ 6] .symtab SYMTAB 0000000000000000 000068 0000c0 18 7 7 8 [ 7] .strtab STRTAB 0000000000000000 000128 000011 00 0 0 1 [ 8] .shstrtab STRTAB 0000000000000000 000139 000045 00 0 0 1 Key to Flags: W (write), A (alloc), X (execute), M (merge), S (strings), I (info), L (link order), O (extra OS processing required), G (group), T (TLS), C (compressed), x (unknown), o (OS specific), E (exclude), l (large), p (processor specific) -- Regards, Peng
