【发布时间】：2016-02-11 15:29:17
【问题描述】：
我正在尝试编译一个链接 nsl 库的项目，但它似乎无法链接库：
/bin/sh ../../libtool --tag=CXX --mode=link g++ -DNDEBUG -std=c++11 -L/usr/lib -R/usr/lib -L../../lib -all-static -lnsl -o Client client.o nettools.o -lgmm -lboost_program_options
libtool: link: g++ -DNDEBUG -std=c++11 -static -o Client client.o nettools.o -L/usr/lib -L../../lib -lnsl -lgmm -lboost_program_options -Wl,-rpath -Wl,/usr/lib
/bin/sh ../../libtool --tag=CXX --mode=link g++ -DNDEBUG -std=c++11 -L/usr/lib -R/usr/lib -L../../lib -all-static -lnsl -o Serveur serveur.o nettools.o -lgmm -lboost_program_options
/bin/ld: cannot find -lnsl
nettools.o: In function `creatSocketCom(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, unsigned int)':
nettools.cc:(.text+0x30e): warning: Using 'gethostbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
collect2: error: ld returned 1 exit status
Makefile:426: recipe for target 'Client' failed
make[2]: *** [Client] Error 1
make[2]: *** Waiting for unfinished jobs....
libtool: link: g++ -DNDEBUG -std=c++11 -static -o Serveur serveur.o nettools.o -L/usr/lib -L../../lib -lnsl -lgmm -lboost_program_options -Wl,-rpath -Wl,/usr/lib
/bin/ld: cannot find -lnsl
nettools.o: In function `creatSocketCom(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, unsigned int)':
nettools.cc:(.text+0x30e): warning: Using 'gethostbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
collect2: error: ld returned 1 exit status
我知道这个库不需要在 Mac OS X 上链接，但我正在运行 Arch Linux。
我有 2 个问题：
为什么即使λ ld --verbose -lnsl 似乎显示它在那里，nsl 仍无法链接？
attempt to open /usr/x86_64-unknown-linux-gnu/lib64/libnsl.so failed
attempt to open /usr/x86_64-unknown-linux-gnu/lib64/libnsl.a failed
attempt to open /usr/lib/libnsl.so succeeded
-lnsl (/usr/lib/libnsl.so)
libc.so.6 needed by /usr/lib/libnsl.so
found libc.so.6 at /usr/lib/libc.so.6
ld-linux-x86-64.so.2 needed by /usr/lib/libc.so.6
found ld-linux-x86-64.so.2 at /usr/lib/ld-linux-x86-64.so.2
ld: warning: cannot find entry symbol _start; not setting start address
告诉 autoconf 不要在不需要的系统上链接 nsl 的最纯粹的方法是什么？
【问题讨论】：