我编译了一个简单的目标文件文件并尝试与 链接ld，但它给出了警告。但是，文件有_start符号，这是readelf对象的。
ELF Header:
Magic: 7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00
Class: ELF64
Data: 2's complement, little endian
Version: 1 (current)
OS/ABI: UNIX - System V
ABI Version: 0
Type: REL (Relocatable file)
Machine: Advanced Micro Devices X86-64
Version: 0x1
Entry point address: 0x40
Start of program headers: 0 (bytes into file)
Start of section headers: 59392 (bytes into file)
Flags: 0x0
Size of this header: 64 (bytes)
Size of program headers: 56 (bytes)
Number of program headers: 0
Size of section headers: 64 (bytes)
Number of section headers: 6
Section header string table index: 5
(...)
Section Headers:
[Nr] Name Type Address Offset
Size EntSize Flags Link Info Align
[ 0] NULL 0000000000000000 00000000
0000000000000000 0000000000000000 0 0 0
[ 1] .text PROGBITS 0000000000000000 00000040
000000000000005c 0000000000000000 AX 0 0 1
[ 2] .data PROGBITS 0000000000000000 00001040
0000000000001000 0000000000000000 WA 0 0 8
[ 3] .symtab SYMTAB 0000000000000000 00003400
0000000000000030 0000000000000018 4 2 8
[ 4] .strtab STRTAB 0000000000000000 00003800
0000000000000400 0000000000000000 0 0 1
[ 5] .shstrtab STRTAB 0000000000000000 00003000
0000000000000400 0000000000000000 0 0 1
(...)
Symbol table '.symtab' contains 2 entries:
Num: Value Size Type Bind Vis Ndx Name
0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND
1: 0000000000000000 87 FUNC GLOBAL DEFAULT 1 _start
这里可能是什么问题