linux LD_DEBUG 调试动态库加载
LD_DEBUG 调试动态库加载
Linux 指定环境变量
可以用来查看程序搜索库的路径，使用方法如下:
LD_DEBUG=libs ./your_program
LD_DEBUG=help 查看命令使用方法
export LD_DEBUG=files # 显示库的依赖性和加载的顺序
export LD_DEBUG=bindings # 符号绑定
export LD_DEBUG=libs # 显示加载器查找库时使用的路径的顺序
export LD_DEBUG=versions # 版本依赖性
export LD_DEBUG=help # LD_DEBUG的帮助信息Mac
使用otool工具
otool --help依赖的库查询
otool -L meyers_singleton
meyers_singleton:
/usr/lib/libc++.1.dylib (compatibility version 1.0.0, current version 1300.23.0)
/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1311.100.3)查看汇编
otool -tV add
add:
(__TEXT,__text) section
_add:
0000000100003f60 pushq %rbp
0000000100003f61 movq %rsp, %rbp
0000000100003f64 movl %edi, -0x4(%rbp)
0000000100003f67 movl %esi, -0x8(%rbp)
0000000100003f6a movl -0x4(%rbp), %eax
0000000100003f6d addl -0x8(%rbp), %eax
0000000100003f70 popq %rbp
0000000100003f71 retq
0000000100003f72 nopw %cs:(%rax,%rax)
0000000100003f7c nopl (%rax)
_main:
0000000100003f80 pushq %rbp
0000000100003f81 movq %rsp, %rbp
0000000100003f84 subq $0x10, %rsp
0000000100003f88 movl $0x0, -0x4(%rbp)
0000000100003f8f movl %edi, -0x8(%rbp)
0000000100003f92 movq %rsi, -0x10(%rbp)
0000000100003f96 movl $0x1, %edi
0000000100003f9b movl $0x2, %esi
0000000100003fa0 callq _add
0000000100003fa5 xorl %eax, %eax
0000000100003fa7 addq $0x10, %rsp
0000000100003fab popq %rbp
0000000100003fac retq