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WinChua edited this page May 9, 2020 · 8 revisions

rpath

  • 相关文档查看: man ld.so; man ld
  • 操作: patchelf
  • 相关变量:
    • ORIGIN: gcc -Wl,-rpath, '$ORIGIN/../lib' main.c
      ORIGIN的作用是将rpath的搜索路径设置为可执行文件
  运行时相对路径, 类似于bash的
  cur_dir=`dirname $0`
  cd ${cur_dir}
    eg 
    % gcc main.c && patchelf --print-needed a.out
libc.so.6
% patchelf --add-needed libhello.so a.out
% patchelf --print-needed a.out
libhello.so
libc.so.6
% ldd -r a.out
    linux-vdso.so.1 =>  (0x00007ffdd8372000)
  /$LIB/libonion.so => /lib64/libonion.so (0x00007f15dd624000)
    libhello.so => not found
    libc.so.6 => /lib64/libc.so.6 (0x00007f15dd147000)
    libdl.so.2 => /lib64/libdl.so.2 (0x00007f15dcf43000)
    /lib64/ld-linux-x86-64.so.2 (0x00007f15dd50b000)
% mkdir lib
% touch lib/libhello.so
% ldd -r a.out
    linux-vdso.so.1 =>  (0x00007ffd95da5000)
    /$LIB/libonion.so => /lib64/libonion.so (0x00007f37f2681000)
    libhello.so => not found
    libc.so.6 => /lib64/libc.so.6 (0x00007f37f21a4000)
    libdl.so.2 => /lib64/libdl.so.2 (0x00007f37f1fa0000)
    /lib64/ld-linux-x86-64.so.2 (0x00007f37f2568000)
% patchelf --set-rpath '$ORIGIN/lib' a.out
% patchelf --print-rpath a.out
$ORIGIN/lib
% ldd -r a.out
./a.out: error while loading shared libraries: /home/winchua/benchmark/tool/testrpath/./lib/libhello.so: file too short
% echo 'void hello(){}' > lib/hello.c && gcc -shared lib/hello.c -o lib/libhello.so
% ldd -r a.out
    linux-vdso.so.1 =>  (0x00007ffc326d6000)
    /$LIB/libonion.so => /lib64/libonion.so (0x00007f9526b4e000)
    libhello.so => /home/winchua/benchmark/tool/testrpath/./lib/libhello.so (0x00007f9526833000)
    libc.so.6 => /lib64/libc.so.6 (0x00007f952646f000)
    libdl.so.2 => /lib64/libdl.so.2 (0x00007f952626b000)
    /lib64/ld-linux-x86-64.so.2 (0x00007f9526a35000)
    gcc -Wl,-rpath,'$ORIGIN/lib' main.c

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