我是 Ubuntu 新手，正在 Amazon EC2 云中运行 Ubuntu。
我正在尝试cppunit在 Ubuntu 框（i386和amd64）上编译，它不会链接到libdl
g++ -g -O2 -o .libs/DllPlugInTester DllPlugInTester.o CommandLineParser.o -ldl ../../src/cppunit/.libs/libcppunit.so -lm -Wl,--rpath -Wl,/home/ubuntu/cppunit/lib
../../src/cppunit/.libs/libcppunit.so: undefined reference to `dlsym'
../../src/cppunit/.libs/libcppunit.so: undefined reference to `dlopen'
../../src/cppunit/.libs/libcppunit.so: undefined reference to `dlclose'
现在我不明白libdl.so存在且正确：
ubuntu@domU-12-31-39-0A-98-1A:~/cppunit$ ls /lib/i386-linux-gnu/libdl*
/lib/i386-linux-gnu/libdl-2.15.so /lib/i386-linux-gnu/libdl.so.2
但是whereis什么都没有：
ubuntu@domU-12-31-39-0A-98-1A:~/cppunit$ whereis libdl
libdl:
libc6已安装：
ubuntu@domU-12-31-39-0A-98-1A:~/cppunit$ sudo apt-get install libc6
Reading package lists... Done
Building dependency tree
Reading state information... Done
libc6 is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
那么为什么我的构建找不到呢？
uname -r是_3.2.0-25-virtual
Fedora 上的“正常” whereis如下所示：
[matt cppunit] whereis libdl
libdl: /lib/libdl.so /usr/lib/libdl.so /lib64/libdl.so /usr/lib64/libdl.so
有任何想法吗？
编辑：我/etc/ld.so.conf.d/*.conf似乎很明智：
ubuntu@domU-12-31-39-0A-98-1A:~$ cat /etc/ld.so.conf.d/*.conf
/usr/lib/i386-linux-gnu/mesa
# Multiarch support
/lib/i386-linux-gnu
/usr/lib/i386-linux-gnu
/lib/i686-linux-gnu
/usr/lib/i686-linux-gnu
# libc default configuration
/usr/local/lib
# This directive teaches ldconfig to search in nosegneg subdirectories
# and cache the DSOs there with extra bit 1 set in their hwcap match
# fields. In Xen guest kernels, the vDSO tells the dynamic linker to
# search in nosegneg subdirectories and to match this extra hwcap bit
# in the ld.so.cache file.
hwcap 1 nosegneg