我最近由Ubuntu升级，而clang ++-5.0无法找到iostream头文件。
> clang++-5.0 a.cpp
a.cpp:2:9: fatal error: 'iostream' file not found
#include<iostream>
^~~~~~~~~~
1 error generated.
我可以看到clang确实可以访问libstdc ++
> ldd /usr/bin/clang++-5.0
linux-vdso.so.1 => (0x00007fffecfce000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007feee4770000)
libLLVM-5.0.so.1 => /usr/lib/x86_64-linux-gnu/libLLVM-5.0.so.1 (0x00007feee11b0000)
libjsoncpp.so.1 => /usr/lib/x86_64-linux-gnu/libjsoncpp.so.1 (0x00007feee0f70000)
libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007feee0bd0000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007feee08c0000)
libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007feee06a0000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007feee02c0000)
/lib64/ld-linux-x86-64.so.2 (0x00007feee4a00000)
libffi.so.6 => /usr/lib/x86_64-linux-gnu/libffi.so.6 (0x00007feee00b0000)
libedit.so.2 => /usr/lib/x86_64-linux-gnu/libedit.so.2 (0x00007feedfe70000)
libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007feedfc50000)
libtinfo.so.5 => /lib/x86_64-linux-gnu/libtinfo.so.5 (0x00007feedfa20000)
libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007feedf800000)
libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007feedf5d0000)
我不太确定缺少什么。如果有人可以帮助我，那将是很棒的。谢谢