Linux compile link

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