尽管设置了 r 路径，但找不到一个 dll

Question

ldd找不到rpath定义中存在的dll。找到了其他一些库（check/./../lib/*）

这里是 ldd 的输出（我们可以看到在 ../lib，但不是自由

root@hyperstream：/DT/local/ADE-trunk4/build-ADE-Desktop-Default/bin#ldd./ade_adminlinux-vdso.so.1=

root@hyperstream：/DT/local/ADE-trunk4/build-ADE-Desktop-Default/bin#file…/lib/libexpat.so.0…/lib/libexpat.so.0：ELF 64位LSB共享对象，x86-64，版本1（SYSV），动态链接，BuildID[sha1]=762de704943d03033d01a9725216d6b05d0740f5，未剥离

这里是rpath：

root @ hyperstream:/DT/local/ADE-trunk 4/build-ADE-Desktop-Default/bin # readelf-d ADE _ admin | grep ' r . * PATH ' 16:0x 00000000000001d(RUNPATH)库运行路径:[${ORIGIN}/../lib]

现在致命的事实是：它与clang 3.8一起工作，但与gcc 6.3一起失败（ubuntu 16.10）

显然，添加一个LD_LIBRARY_PATH=../lib 使它再次工作，但 rpath 的目标是避免设置它

root @ hyperstream:/DT/local/ADE-trunk 4/build-ADE-Desktop-Default/bin # export LD _ LIBRARY _ PATH =../lib root @ hyperstream:/DT/local/ADE-trunk 4/build-ADE-Desktop-Default/bin # ldd。/ade_admin linux-vdso.so.1 =

有什么想法吗？

当做

【人名】劳伦

Answer 1

我只是找到了一个解释：clang放在了elf二进制ALL库的[NEEDED]部分（即使是我自己没有明确包含的库，但被我包含的库的[NEEDED]部分引用）

来自gcc的示例：

readelf -d my_prog

Dynamic section at offset 0x9cb548 contains 46 entries:
  Tag        Type                         Name/Value
 0x0000000000000001 (NEEDED)             Shared library: [libadeversion.so]
 0x0000000000000001 (NEEDED)             Shared library: [libuuid.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [libsqlite3.so]
 0x0000000000000001 (NEEDED)             Shared library: [libpthread.so.0]
 0x0000000000000001 (NEEDED)             Shared library: [libaprutil-1.so.0]
 0x0000000000000001 (NEEDED)             Shared library: [libapr-1.so.0]
 0x0000000000000001 (NEEDED)             Shared library: [libavahi-client.so.3]
 0x0000000000000001 (NEEDED)             Shared library: [libavahi-common.so.3]
 0x0000000000000001 (NEEDED)             Shared library: [libdl.so.2]
 0x0000000000000001 (NEEDED)             Shared library: [libaio.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [librt.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [lib_adm64.so]
 0x0000000000000001 (NEEDED)             Shared library: [lib_dict64.so]
 0x0000000000000001 (NEEDED)             Shared library: [lib_rdm64.so]
 0x0000000000000001 (NEEDED)             Shared library: [lib_dbr64.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]
 0x000000000000001d (RUNPATH)            Library runpath: [${ORIGIN}/../lib/:$ORIGIN/../lib/:../lib/]

从叮当声：

readelf -d my_prog

Dynamic section at offset 0xa7bae8 contains 54 entries:
  Tag        Type                         Name/Value
 0x0000000000000001 (NEEDED)             Shared library: [libadeversion.so]
 0x0000000000000001 (NEEDED)             Shared library: [libuuid.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [libsqlite3.so]
 0x0000000000000001 (NEEDED)             Shared library: [libpthread.so.0]
 0x0000000000000001 (NEEDED)             Shared library: [libaprutil-1.so.0]
 0x0000000000000001 (NEEDED)             Shared library: [libexpat.so.0]
 0x0000000000000001 (NEEDED)             Shared library: [libapr-1.so.0]
 0x0000000000000001 (NEEDED)             Shared library: [libavahi-client.so.3]
 0x0000000000000001 (NEEDED)             Shared library: [libavahi-common.so.3]
 0x0000000000000001 (NEEDED)             Shared library: [libdl.so.2]
 0x0000000000000001 (NEEDED)             Shared library: [libaio.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [libcrypt.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [librt.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [lib_adm64.so]
 0x0000000000000001 (NEEDED)             Shared library: [lib_dict64.so]
 0x0000000000000001 (NEEDED)             Shared library: [lib_rdm64.so]
 0x0000000000000001 (NEEDED)             Shared library: [lib_rpc64.so]
 0x0000000000000001 (NEEDED)             Shared library: [lib_sql64.so]
 0x0000000000000001 (NEEDED)             Shared library: [lib_rdbc64.so]
 0x0000000000000001 (NEEDED)             Shared library: [lib_rm64.so]
 0x0000000000000001 (NEEDED)             Shared library: [lib_ncp64.so]
 0x0000000000000001 (NEEDED)             Shared library: [lib_cmp64.so]
 0x0000000000000001 (NEEDED)             Shared library: [lib_repfltr64.so]
 0x0000000000000001 (NEEDED)             Shared library: [lib_expat64.so]
 0x0000000000000001 (NEEDED)             Shared library: [lib_cncp64.so]
 0x0000000000000001 (NEEDED)             Shared library: [lib_dbr64.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]
 0x000000000000001d (RUNPATH)            Library runpath: [${ORIGIN}/../lib/:$ORIGIN/../lib/:../lib/]

一个dll包含缺少的一个libexpat：

readelf -d ../lib/libaprutil-1.so.0 

Dynamic section at offset 0x1e698 contains 29 entries:
  Tag        Type                         Name/Value
 0x0000000000000001 (NEEDED)             Shared library: **[libexpat.so.0]**
 0x0000000000000001 (NEEDED)             Shared library: [libapr-1.so.0]
 0x0000000000000001 (NEEDED)             Shared library: [libuuid.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [librt.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [libcrypt.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [libpthread.so.0]
 0x0000000000000001 (NEEDED)             Shared library: [libdl.so.2]
 0x0000000000000001 (NEEDED)             Shared library: [libc.so.6]
 0x000000000000000e (SONAME)             Library soname: [libaprutil-1.so.0]

但是RUNPATH只由二进制文件使用，而不是由dll使用(dll也可以有自己的RUNPATH)。

2个解决方案:-在libaprutil-1.so.0中添加一个运行路径，以强制包含来自“.”的库-在我的构建中显式添加所有缺失的dll

希望有帮助