//"blank.c"
//即使不显示增加#include ，gcc编译链接时也会默认链接相关库文件
int printf(const char* format,...);
int main() {
printf("aaaa\n");
return 17;
}
root@vultr:~/clang# gcc -v blank.c
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/5/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 5.4.0-6ubuntu1~16.04.11' --with-bugurl=file:///usr/share/doc/gcc-5/README.Bugs --enable-languages=c,ada,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-5 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-5-amd64/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-5-amd64 --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-5-amd64 --with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.11)
COLLECT_GCC_OPTIONS='-v' '-mtune=generic' '-march=x86-64'
/usr/lib/gcc/x86_64-linux-gnu/5/cc1 -quiet -v -imultiarch x86_64-linux-gnu blank.c -quiet -dumpbase blank.c -mtune=generic -march=x86-64 -auxbase blank -version -fstack-protector-strong -Wformat -Wformat-security -o /tmp/ccZFOaqX.s
GNU C11 (Ubuntu 5.4.0-6ubuntu1~16.04.11) version 5.4.0 20160609 (x86_64-linux-gnu)
compiled by GNU C version 5.4.0 20160609, GMP version 6.1.0, MPFR version 3.1.4, MPC version 1.0.3
GGC heuristics: --param ggc-min-expand=97 --param ggc-min-heapsize=126976
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/5/../../../../x86_64-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/lib/gcc/x86_64-linux-gnu/5/include
/usr/local/include
/usr/lib/gcc/x86_64-linux-gnu/5/include-fixed
/usr/include/x86_64-linux-gnu
/usr/include
End of search list.
GNU C11 (Ubuntu 5.4.0-6ubuntu1~16.04.11) version 5.4.0 20160609 (x86_64-linux-gnu)
compiled by GNU C version 5.4.0 20160609, GMP version 6.1.0, MPFR version 3.1.4, MPC version 1.0.3
GGC heuristics: --param ggc-min-expand=97 --param ggc-min-heapsize=126976
Compiler executable checksum: 5f69ca549f086e2c3748f9d1423a4dee
COLLECT_GCC_OPTIONS='-v' '-mtune=generic' '-march=x86-64'
as -v --64 -o /tmp/cc4eUdY0.o /tmp/ccZFOaqX.s
GNU assembler version 2.26.1 (x86_64-linux-gnu) using BFD version (GNU Binutils for Ubuntu) 2.26.1
COMPILER_PATH=/usr/lib/gcc/x86_64-linux-gnu/5/:/usr/lib/gcc/x86_64-linux-gnu/5/:/usr/lib/gcc/x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/5/:/usr/lib/gcc/x86_64-linux-gnu/
LIBRARY_PATH=/usr/lib/gcc/x86_64-linux-gnu/5/:/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/5/../../../../lib/:/lib/x86_64-linux-gnu/:/lib/../lib/:/usr/lib/x86_64-linux-gnu/:/usr/lib/../lib/:/usr/lib/gcc/x86_64-linux-gnu/5/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-mtune=generic' '-march=x86-64'
/usr/lib/gcc/x86_64-linux-gnu/5/collect2 -plugin /usr/lib/gcc/x86_64-linux-gnu/5/liblto_plugin.so -plugin-opt=/usr/lib/gcc/x86_64-linux-gnu/5/lto-wrapper -plugin-opt=-fresolution=/tmp/cclq7sy4.res -plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lc -plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lgcc_s --sysroot=/ --build-id --eh-frame-hdr -m elf_x86_64 --hash-style=gnu --as-needed -dynamic-linker /lib64/ld-linux-x86-64.so.2 -z relro /usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crt1.o /usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crti.o /usr/lib/gcc/x86_64-linux-gnu/5/crtbegin.o -L/usr/lib/gcc/x86_64-linux-gnu/5 -L/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu -L/usr/lib/gcc/x86_64-linux-gnu/5/../../../../lib -L/lib/x86_64-linux-gnu -L/lib/../lib -L/usr/lib/x86_64-linux-gnu -L/usr/lib/../lib -L/usr/lib/gcc/x86_64-linux-gnu/5/../../.. /tmp/cc4eUdY0.o -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed /usr/lib/gcc/x86_64-linux-gnu/5/crtend.o /usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crtn.o
root@vultr:~/clang# ls
a.out blank.c
root@vultr:~/clang# ./a.out
aaaa
root@vultr:~/clang# echo $?
17
root@vultr:~/clang# ldd a.out
linux-vdso.so.1 => (0x00007fffbc3c5000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f8d80ca6000)
/lib64/ld-linux-x86-64.so.2 (0x00007f8d81070000)
root@vultr:~/clang#
root@vultr:~/clang# objdump -d a.out
a.out: file format elf64-x86-64
Disassembly of section .init:
00000000004003c8 <_init>:
4003c8: 48 83 ec 08 sub $0x8,%rsp
4003cc: 48 8b 05 25 0c 20 00 mov 0x200c25(%rip),%rax # 600ff8 <_DYNAMIC+0x1d0>
4003d3: 48 85 c0 test %rax,%rax
4003d6: 74 05 je 4003dd <_init+0x15>
4003d8: e8 43 00 00 00 callq 400420 <__libc_start_main@plt+0x10>
4003dd: 48 83 c4 08 add $0x8,%rsp
4003e1: c3 retq
Disassembly of section .plt:
00000000004003f0 :
4003f0: ff 35 12 0c 20 00 pushq 0x200c12(%rip) # 601008 <_GLOBAL_OFFSET_TABLE_+0x8>
4003f6: ff 25 14 0c 20 00 jmpq *0x200c14(%rip) # 601010 <_GLOBAL_OFFSET_TABLE_+0x10>
4003fc: 0f 1f 40 00 nopl 0x0(%rax)
0000000000400400 :
400400: ff 25 12 0c 20 00 jmpq *0x200c12(%rip) # 601018 <_GLOBAL_OFFSET_TABLE_+0x18>
400406: 68 00 00 00 00 pushq $0x0
40040b: e9 e0 ff ff ff jmpq 4003f0 <_init+0x28>
0000000000400410 <__libc_start_main@plt>:
400410: ff 25 0a 0c 20 00 jmpq *0x200c0a(%rip) # 601020 <_GLOBAL_OFFSET_TABLE_+0x20>
400416: 68 01 00 00 00 pushq $0x1
40041b: e9 d0 ff ff ff jmpq 4003f0 <_init+0x28>
Disassembly of section .plt.got:
0000000000400420 <.plt.got>:
400420: ff 25 d2 0b 20 00 jmpq *0x200bd2(%rip) # 600ff8 <_DYNAMIC+0x1d0>
400426: 66 90 xchg %ax,%ax
Disassembly of section .text:
0000000000400430 <_start>:
400430: 31 ed xor %ebp,%ebp
400432: 49 89 d1 mov %rdx,%r9
400435: 5e pop %rsi
400436: 48 89 e2 mov %rsp,%rdx
400439: 48 83 e4 f0 and $0xfffffffffffffff0,%rsp
40043d: 50 push %rax
40043e: 54 push %rsp
40043f: 49 c7 c0 b0 05 40 00 mov $0x4005b0,%r8
400446: 48 c7 c1 40 05 40 00 mov $0x400540,%rcx
40044d: 48 c7 c7 26 05 40 00 mov $0x400526,%rdi
400454: e8 b7 ff ff ff callq 400410 <__libc_start_main@plt>
400459: f4 hlt
40045a: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1)
0000000000400460 :
400460: b8 3f 10 60 00 mov $0x60103f,%eax
400465: 55 push %rbp
400466: 48 2d 38 10 60 00 sub $0x601038,%rax
40046c: 48 83 f8 0e cmp $0xe,%rax
400470: 48 89 e5 mov %rsp,%rbp
400473: 76 1b jbe 400490
400475: b8 00 00 00 00 mov $0x0,%eax
40047a: 48 85 c0 test %rax,%rax
40047d: 74 11 je 400490
40047f: 5d pop %rbp
400480: bf 38 10 60 00 mov $0x601038,%edi
400485: ff e0 jmpq *%rax
400487: 66 0f 1f 84 00 00 00 nopw 0x0(%rax,%rax,1)
40048e: 00 00
400490: 5d pop %rbp
400491: c3 retq
400492: 0f 1f 40 00 nopl 0x0(%rax)
400496: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1)
40049d: 00 00 00
00000000004004a0 :
4004a0: be 38 10 60 00 mov $0x601038,%esi
4004a5: 55 push %rbp
4004a6: 48 81 ee 38 10 60 00 sub $0x601038,%rsi
4004ad: 48 c1 fe 03 sar $0x3,%rsi
4004b1: 48 89 e5 mov %rsp,%rbp
4004b4: 48 89 f0 mov %rsi,%rax
4004b7: 48 c1 e8 3f shr $0x3f,%rax
4004bb: 48 01 c6 add %rax,%rsi
4004be: 48 d1 fe sar %rsi
4004c1: 74 15 je 4004d8
4004c3: b8 00 00 00 00 mov $0x0,%eax
4004c8: 48 85 c0 test %rax,%rax
4004cb: 74 0b je 4004d8
4004cd: 5d pop %rbp
4004ce: bf 38 10 60 00 mov $0x601038,%edi
4004d3: ff e0 jmpq *%rax
4004d5: 0f 1f 00 nopl (%rax)
4004d8: 5d pop %rbp
4004d9: c3 retq
4004da: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1)
00000000004004e0 <__do_global_dtors_aux>:
4004e0: 80 3d 51 0b 20 00 00 cmpb $0x0,0x200b51(%rip) # 601038 <__TMC_END__>
4004e7: 75 11 jne 4004fa <__do_global_dtors_aux+0x1a>
4004e9: 55 push %rbp
4004ea: 48 89 e5 mov %rsp,%rbp
4004ed: e8 6e ff ff ff callq 400460
4004f2: 5d pop %rbp
4004f3: c6 05 3e 0b 20 00 01 movb $0x1,0x200b3e(%rip) # 601038 <__TMC_END__>
4004fa: f3 c3 repz retq
4004fc: 0f 1f 40 00 nopl 0x0(%rax)
0000000000400500 :
400500: bf 20 0e 60 00 mov $0x600e20,%edi
400505: 48 83 3f 00 cmpq $0x0,(%rdi)
400509: 75 05 jne 400510
40050b: eb 93 jmp 4004a0
40050d: 0f 1f 00 nopl (%rax)
400510: b8 00 00 00 00 mov $0x0,%eax
400515: 48 85 c0 test %rax,%rax
400518: 74 f1 je 40050b
40051a: 55 push %rbp
40051b: 48 89 e5 mov %rsp,%rbp
40051e: ff d0 callq *%rax
400520: 5d pop %rbp
400521: e9 7a ff ff ff jmpq 4004a0
0000000000400526 :
400526: 55 push %rbp
400527: 48 89 e5 mov %rsp,%rbp
40052a: bf c4 05 40 00 mov $0x4005c4,%edi
40052f: e8 cc fe ff ff callq 400400
400534: b8 11 00 00 00 mov $0x11,%eax
400539: 5d pop %rbp
40053a: c3 retq
40053b: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
0000000000400540 <__libc_csu_init>:
400540: 41 57 push %r15
400542: 41 56 push %r14
400544: 41 89 ff mov %edi,%r15d
400547: 41 55 push %r13
400549: 41 54 push %r12
40054b: 4c 8d 25 be 08 20 00 lea 0x2008be(%rip),%r12 # 600e10 <__frame_dummy_init_array_entry>
400552: 55 push %rbp
400553: 48 8d 2d be 08 20 00 lea 0x2008be(%rip),%rbp # 600e18 <__init_array_end>
40055a: 53 push %rbx
40055b: 49 89 f6 mov %rsi,%r14
40055e: 49 89 d5 mov %rdx,%r13
400561: 4c 29 e5 sub %r12,%rbp
400564: 48 83 ec 08 sub $0x8,%rsp
400568: 48 c1 fd 03 sar $0x3,%rbp
40056c: e8 57 fe ff ff callq 4003c8 <_init>
400571: 48 85 ed test %rbp,%rbp
400574: 74 20 je 400596 <__libc_csu_init+0x56>
400576: 31 db xor %ebx,%ebx
400578: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1)
40057f: 00
400580: 4c 89 ea mov %r13,%rdx
400583: 4c 89 f6 mov %r14,%rsi
400586: 44 89 ff mov %r15d,%edi
400589: 41 ff 14 dc callq *(%r12,%rbx,8)
40058d: 48 83 c3 01 add $0x1,%rbx
400591: 48 39 eb cmp %rbp,%rbx
400594: 75 ea jne 400580 <__libc_csu_init+0x40>
400596: 48 83 c4 08 add $0x8,%rsp
40059a: 5b pop %rbx
40059b: 5d pop %rbp
40059c: 41 5c pop %r12
40059e: 41 5d pop %r13
4005a0: 41 5e pop %r14
4005a2: 41 5f pop %r15
4005a4: c3 retq
4005a5: 90 nop
4005a6: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1)
4005ad: 00 00 00
00000000004005b0 <__libc_csu_fini>:
4005b0: f3 c3 repz retq
Disassembly of section .fini:
00000000004005b4 <_fini>:
4005b4: 48 83 ec 08 sub $0x8,%rsp
4005b8: 48 83 c4 08 add $0x8,%rsp
4005bc: c3 retq
root@vultr:~/clang#
root@vultr:~/clang# objdump -h a.out
a.out: file format elf64-x86-64
Sections:
Idx Name Size VMA LMA File off Algn
0 .interp 0000001c 0000000000400238 0000000000400238 00000238 2**0
CONTENTS, ALLOC, LOAD, READONLY, DATA
1 .note.ABI-tag 00000020 0000000000400254 0000000000400254 00000254 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
2 .note.gnu.build-id 00000024 0000000000400274 0000000000400274 00000274 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
3 .gnu.hash 0000001c 0000000000400298 0000000000400298 00000298 2**3
CONTENTS, ALLOC, LOAD, READONLY, DATA
4 .dynsym 00000060 00000000004002b8 00000000004002b8 000002b8 2**3
CONTENTS, ALLOC, LOAD, READONLY, DATA
5 .dynstr 0000003d 0000000000400318 0000000000400318 00000318 2**0
CONTENTS, ALLOC, LOAD, READONLY, DATA
6 .gnu.version 00000008 0000000000400356 0000000000400356 00000356 2**1
CONTENTS, ALLOC, LOAD, READONLY, DATA
7 .gnu.version_r 00000020 0000000000400360 0000000000400360 00000360 2**3
CONTENTS, ALLOC, LOAD, READONLY, DATA
8 .rela.dyn 00000018 0000000000400380 0000000000400380 00000380 2**3
CONTENTS, ALLOC, LOAD, READONLY, DATA
9 .rela.plt 00000030 0000000000400398 0000000000400398 00000398 2**3
CONTENTS, ALLOC, LOAD, READONLY, DATA
10 .init 0000001a 00000000004003c8 00000000004003c8 000003c8 2**2
CONTENTS, ALLOC, LOAD, READONLY, CODE
11 .plt 00000030 00000000004003f0 00000000004003f0 000003f0 2**4
CONTENTS, ALLOC, LOAD, READONLY, CODE
12 .plt.got 00000008 0000000000400420 0000000000400420 00000420 2**3
CONTENTS, ALLOC, LOAD, READONLY, CODE
13 .text 00000182 0000000000400430 0000000000400430 00000430 2**4
CONTENTS, ALLOC, LOAD, READONLY, CODE
14 .fini 00000009 00000000004005b4 00000000004005b4 000005b4 2**2
CONTENTS, ALLOC, LOAD, READONLY, CODE
15 .rodata 00000009 00000000004005c0 00000000004005c0 000005c0 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
16 .eh_frame_hdr 00000034 00000000004005cc 00000000004005cc 000005cc 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
17 .eh_frame 000000f4 0000000000400600 0000000000400600 00000600 2**3
CONTENTS, ALLOC, LOAD, READONLY, DATA
18 .init_array 00000008 0000000000600e10 0000000000600e10 00000e10 2**3
CONTENTS, ALLOC, LOAD, DATA
19 .fini_array 00000008 0000000000600e18 0000000000600e18 00000e18 2**3
CONTENTS, ALLOC, LOAD, DATA
20 .jcr 00000008 0000000000600e20 0000000000600e20 00000e20 2**3
CONTENTS, ALLOC, LOAD, DATA
21 .dynamic 000001d0 0000000000600e28 0000000000600e28 00000e28 2**3
CONTENTS, ALLOC, LOAD, DATA
22 .got 00000008 0000000000600ff8 0000000000600ff8 00000ff8 2**3
CONTENTS, ALLOC, LOAD, DATA
23 .got.plt 00000028 0000000000601000 0000000000601000 00001000 2**3
CONTENTS, ALLOC, LOAD, DATA
24 .data 00000010 0000000000601028 0000000000601028 00001028 2**3
CONTENTS, ALLOC, LOAD, DATA
25 .bss 00000008 0000000000601038 0000000000601038 00001038 2**0
ALLOC
26 .comment 00000035 0000000000000000 0000000000000000 00001038 2**0
CONTENTS, READONLY
root@vultr:~/clang#
