[TOC]

概述

库是已经写好的，成熟的，可以复用的代码。程序员编程的时候都要依赖很多基础的底层库。本质上来说库是一种可执行代码的二进制形式，可以被操作系统载入内存执行。库有两种：静态库（.a、.lib）和动态库（.so、.dll）。

回顾将源程序到可执行程序的过程：

image-20230214122539344

查看静态库连接的外部库

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(base) readelf -d  libvision.so 

Dynamic section at offset 0x579150 contains 35 entries:
  Tag        Type                         Name/Value
 0x0000000000000001 (NEEDED)             Shared library: [libopencv_calib3d.so.2.4]
 0x0000000000000001 (NEEDED)             Shared library: [libopencv_highgui.so.2.4]
 0x0000000000000001 (NEEDED)             Shared library: [libopencv_imgproc.so.2.4]
 0x0000000000000001 (NEEDED)             Shared library: [libopencv_core.so.2.4]
 0x0000000000000001 (NEEDED)             Shared library: [libQnnHtp.so]
 0x0000000000000001 (NEEDED)             Shared library: [libQnnSystem.so]
 0x0000000000000001 (NEEDED)             Shared library: [libstdc++.so.6]
 0x0000000000000001 (NEEDED)             Shared library: [libm.so.6]
 0x0000000000000001 (NEEDED)             Shared library: [libgcc_s.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [libc.so.6]
 0x000000000000000e (SONAME)             Library soname: [libvision.so]
 0x000000000000001d (RUNPATH)            Library runpath: [/home/frewen/02.ProjectSpace/01.WorkSpace/perception-vision-ability/thirdparty/qnn/v2.5.0/prebuilt/linux-x86_64-debug:/home/frewen/02.ProjectSpace/01.WorkSpace/perception-vision-ability/thirdparty/qnn/v2.5.0/target/linux-x86_64/lib:/home/frewen/02.ProjectSpace/01.WorkSpace/perception-vision-ability/thirdparty/flatbuffers/2.0.0/prebuilt/linux-x86_64-debug/v2.5.0:/home/frewen/02.ProjectSpace/01.WorkSpace/perception-vision-ability/thirdparty/3d-landmark/v6.0/lib/linux-x86_64:/home/frewen/02.ProjectSpace/01.WorkSpace/perception-vision-ability/thirdparty/opencv/opencv_2.4.13.4/linux-x86_64/lib:/home/frewen/02.ProjectSpace/01.WorkSpace/perception-vision-ability/thirdparty/opencv/opencv_2.4.13.4/linux-x86_64/3rdparty:]
 0x000000000000000c (INIT)               0x2a2000
 0x000000000000000d (FINI)               0x4aeff4
 0x0000000000000019 (INIT_ARRAY)         0x574588
 0x000000000000001b (INIT_ARRAYSZ)       800 (bytes)
 0x000000000000001a (FINI_ARRAY)         0x5748a8
 0x000000000000001c (FINI_ARRAYSZ)       8 (bytes)
 0x000000006ffffef5 (GNU_HASH)           0x260
 0x0000000000000005 (STRTAB)             0x999b0
 0x0000000000000006 (SYMTAB)             0x26ea0
 0x000000000000000a (STRSZ)              1686853 (bytes)
 0x000000000000000b (SYMENT)             24 (bytes)
 0x0000000000000003 (PLTGOT)             0x57b000
 0x0000000000000002 (PLTRELSZ)           332808 (bytes)
 0x0000000000000014 (PLTREL)             RELA
 0x0000000000000017 (JMPREL)             0x250b90
 0x0000000000000007 (RELA)               0x23f1a8
 0x0000000000000008 (RELASZ)             72168 (bytes)
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(base) ldd libvision.so 
        linux-vdso.so.1 (0x00007ffdf5f32000)
        libopencv_calib3d.so.2.4 => /home/frewen/02.ProjectSpace/01.WorkSpace/perception-vision-ability/thirdparty/opencv/opencv_2.4.13.4/linux-x86_64/lib/libopencv_calib3d.so.2.4 (0x00007f37388e5000)
        libopencv_highgui.so.2.4 => /home/frewen/02.ProjectSpace/01.WorkSpace/perception-vision-ability/thirdparty/opencv/opencv_2.4.13.4/linux-x86_64/lib/libopencv_highgui.so.2.4 (0x00007f37385d1000)
        libopencv_imgproc.so.2.4 => /home/frewen/02.ProjectSpace/01.WorkSpace/perception-vision-ability/thirdparty/opencv/opencv_2.4.13.4/linux-x86_64/lib/libopencv_imgproc.so.2.4 (0x00007f37380b9000)
        libopencv_core.so.2.4 => /home/frewen/02.ProjectSpace/01.WorkSpace/perception-vision-ability/thirdparty/opencv/opencv_2.4.13.4/linux-x86_64/lib/libopencv_core.so.2.4 (0x00007f3737c0e000)
        libQnnHtp.so => /home/frewen/02.ProjectSpace/01.WorkSpace/perception-vision-ability/thirdparty/qnn/v2.5.0/target/linux-x86_64/lib/libQnnHtp.so (0x00007f3734276000)
        libQnnSystem.so => /home/frewen/02.ProjectSpace/01.WorkSpace/perception-vision-ability/thirdparty/qnn/v2.5.0/target/linux-x86_64/lib/libQnnSystem.so (0x00007f3734064000)
        libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f3733e67000)
        libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f3733d18000)
        libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f3733cfb000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f3733b09000)
        libopencv_features2d.so.2.4 => not found
        libopencv_flann.so.2.4 => not found
        libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f3733ae6000)
        libgtk-x11-2.0.so.0 => /lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0 (0x00007f373368a000)
        libgdk-x11-2.0.so.0 => /lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0 (0x00007f37335cf000)
        libgobject-2.0.so.0 => /lib/x86_64-linux-gnu/libgobject-2.0.so.0 (0x00007f373356f000)
        libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007f3733446000)
        librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f373343c000)
        libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f373341e000)
        libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f3733418000)
        libc++.so.1 => /lib/x86_64-linux-gnu/libc++.so.1 (0x00007f3733356000)
        libc++abi.so.1 => /lib/x86_64-linux-gnu/libc++abi.so.1 (0x00007f373331e000)
        /lib64/ld-linux-x86-64.so.2 (0x00007f373ebd7000)
        libgmodule-2.0.so.0 => /lib/x86_64-linux-gnu/libgmodule-2.0.so.0 (0x00007f3733318000)
        libpangocairo-1.0.so.0 => /lib/x86_64-linux-gnu/libpangocairo-1.0.so.0 (0x00007f3733306000)
        libX11.so.6 => /lib/x86_64-linux-gnu/libX11.so.6 (0x00007f37331c7000)
        libXfixes.so.3 => /lib/x86_64-linux-gnu/libXfixes.so.3 (0x00007f37331bf000)
        libatk-1.0.so.0 => /lib/x86_64-linux-gnu/libatk-1.0.so.0 (0x00007f3733195000)
        libcairo.so.2 => /lib/x86_64-linux-gnu/libcairo.so.2 (0x00007f3733072000)
        libgdk_pixbuf-2.0.so.0 => /lib/x86_64-linux-gnu/libgdk_pixbuf-2.0.so.0 (0x00007f373304a000)
        libgio-2.0.so.0 => /lib/x86_64-linux-gnu/libgio-2.0.so.0 (0x00007f3732e69000)
        libpangoft2-1.0.so.0 => /lib/x86_64-linux-gnu/libpangoft2-1.0.so.0 (0x00007f3732e4e000)
        libpango-1.0.so.0 => /lib/x86_64-linux-gnu/libpango-1.0.so.0 (0x00007f3732dff000)
        libfontconfig.so.1 => /lib/x86_64-linux-gnu/libfontconfig.so.1 (0x00007f3732db8000)
        libXrender.so.1 => /lib/x86_64-linux-gnu/libXrender.so.1 (0x00007f3732bae000)
        libXinerama.so.1 => /lib/x86_64-linux-gnu/libXinerama.so.1 (0x00007f3732ba9000)
        libXi.so.6 => /lib/x86_64-linux-gnu/libXi.so.6 (0x00007f3732b97000)
        libXrandr.so.2 => /lib/x86_64-linux-gnu/libXrandr.so.2 (0x00007f3732b88000)
        libXcursor.so.1 => /lib/x86_64-linux-gnu/libXcursor.so.1 (0x00007f3732b7b000)
        libXcomposite.so.1 => /lib/x86_64-linux-gnu/libXcomposite.so.1 (0x00007f3732b76000)
        libXdamage.so.1 => /lib/x86_64-linux-gnu/libXdamage.so.1 (0x00007f3732b71000)
        libXext.so.6 => /lib/x86_64-linux-gnu/libXext.so.6 (0x00007f3732b5c000)
        libffi.so.7 => /lib/x86_64-linux-gnu/libffi.so.7 (0x00007f3732b50000)
        libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007f3732adb000)
        libxcb.so.1 => /lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f3732ab1000)
        libpixman-1.so.0 => /lib/x86_64-linux-gnu/libpixman-1.so.0 (0x00007f3732a0a000)
        libfreetype.so.6 => /lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007f373294b000)
        libpng16.so.16 => /lib/x86_64-linux-gnu/libpng16.so.16 (0x00007f3732913000)
        libxcb-shm.so.0 => /lib/x86_64-linux-gnu/libxcb-shm.so.0 (0x00007f373290c000)
        libxcb-render.so.0 => /lib/x86_64-linux-gnu/libxcb-render.so.0 (0x00007f37328fd000)
        libmount.so.1 => /lib/x86_64-linux-gnu/libmount.so.1 (0x00007f373289d000)
        libselinux.so.1 => /lib/x86_64-linux-gnu/libselinux.so.1 (0x00007f3732872000)
        libresolv.so.2 => /lib/x86_64-linux-gnu/libresolv.so.2 (0x00007f3732856000)
        libharfbuzz.so.0 => /lib/x86_64-linux-gnu/libharfbuzz.so.0 (0x00007f3732750000)
        libfribidi.so.0 => /lib/x86_64-linux-gnu/libfribidi.so.0 (0x00007f3732733000)
        libthai.so.0 => /lib/x86_64-linux-gnu/libthai.so.0 (0x00007f3732728000)
        libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007f37326fa000)
        libuuid.so.1 => /lib/x86_64-linux-gnu/libuuid.so.1 (0x00007f37326f1000)
        libXau.so.6 => /lib/x86_64-linux-gnu/libXau.so.6 (0x00007f37326e9000)
        libXdmcp.so.6 => /lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f37326e1000)
        libblkid.so.1 => /lib/x86_64-linux-gnu/libblkid.so.1 (0x00007f373268a000)
        libpcre2-8.so.0 => /lib/x86_64-linux-gnu/libpcre2-8.so.0 (0x00007f37325f9000)
        libgraphite2.so.3 => /lib/x86_64-linux-gnu/libgraphite2.so.3 (0x00007f37325cc000)
        libdatrie.so.1 => /lib/x86_64-linux-gnu/libdatrie.so.1 (0x00007f37325c0000)
        libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007f37325a6000)
(base)