clang未能连接2线主功能程序

Question

我很容易得到clang，当我尝试编译简单的2行程序时会发生这种情况:(我在机器上有g ++，IDK，如果这是问题的原因）

clang teststring.cpp -v Ubuntu clang version 3.0-6ubuntu3（tags / RELEASE_30 / final）（基于LLVM 3.0）目标：i386-pc-linux-gnu线程模型：posix“/ usr / bin / clang”-cc1 -triple i386-pc-linux-gnu -emit-obj -mrelax-all -disable-free -disable-llvm-verifier -main-file-name teststring.cpp -mrelocation-model static -mdisable-fp-elim -masm-verbose - mconstructor-aliases -target-cpu pentium4 -target-linker-version 2.22 -momit-leaf-frame-pointer -v -resource-dir /usr/bin/../lib/clang/3.0 -fmodule-cache-path / var / tmp / clang-module-cache -internal-isystem /usr/include/c++/4.6 -internal-isystem /usr/include/c++/4.6/i686-linux-gnu -internal-isystem /usr/include/c++/4.6 / backward -internal-isystem / usr / local / include -internal-isystem /usr/bin/../lib/clang/3.0/include -internal-externc-isystem / usr / include / i686-linux-gnu -internal- externc-isystem / usr / include -fdeprecated-macro -ferror-limit 19 -fmessage-length 80 -fgnu-runtime -fobjc-runtime-has-arc -fobjc-runtime-has-weak -fobjc-fragile-abi -fcxx- EXC eptions -fexceptions -fdiagnostics-show-option -fcolor-diagnostics -o /tmp/teststring-e3FNx4.o -x c ++ teststring.cpp clang -cc1 version 3.0基于llvm 3.0托管在i386-pc-linux-gnu上忽略不存在的目录“/ usr / include / i686-linux-gnu”忽略不存在的目录“/usr/include/c++/4.6//i686-linux-gnu/32”忽略不存在的目录“/ usr / include / i686-linux-gnu /”忽略不存在的目录“/ usr / include / i686-linux-gnu”忽略重复目录“/usr/include/c++/4.6”忽略重复目录“/usr/include/c++/4.6/i686-linux-gnu”忽略重复目录“/usr/include/c++/4.6/backward”忽略重复目录“/usr/include/c++/4.6”忽略重复目录“/usr/include/c++/4.6/backward”忽略重复目录“/ usr / include / c ++ /4.6“忽略重复目录”/usr/include/c++/4.6/i686-linux-gnu“忽略重复目录”/usr/include/c++/4.6/backward“忽略重复目录”/ usr / local / include“忽略重复目录“/ u sr / bin /../ lib / clang / 3.0 / include“忽略重复目录”/ usr / include“include”...“搜索从这里开始：include <...>搜索从这里开始：/ usr / include / c ++ /4.6 /usr/include/c++/4.6/i686-linux-gnu /usr/include/c++/4.6/backward
/ usr / local / include /usr/bin/../lib/clang/3.0/include / usr / include
/ usr / include / i386-linux-gnu / /usr/include/clang/3.0/include/ /usr/lib/gcc/i686-linux-gnu/4.6/include/
/usr/lib/gcc/i686-linux-gnu/4.6/include-fixed/搜索结束列表。
“/ usr / bin / ld”-z relro --hash-style = gnu --as-needed --build-id --eh-frame-hdr -m elf_i386 -dynamic-linker /lib/ld-linux.so .2 -o a.out /usr/lib/gcc/i686-linux-gnu/4.6/../../../i386-linux-gnu/crt1.o / usr / lib / gcc / i686-linux -gnu / 4.6 /../../../ i386-linux-gnu / crti.o /usr/lib/gcc/i686-linux-gnu/4.6/crtbegin.o -L / usr / lib / gcc / i686-linux-gnu / 4.6 -L / usr / lib / gcc / i686-linux-gnu / 4.6 /../../../ i386-linux-gnu -L / lib / i386-linux-gnu -L / usr / lib / i386-linux-gnu -L / usr / lib / gcc / i686-linux-gnu / 4.6 /../../../ i386-linux-gnu -L / usr / lib / gcc / i686-linux-gnu / 4.6 /../../ .. -L / lib / i386-linux-gnu -L / lib -L ​​/ usr / lib / i386-linux-gnu -L / usr / lib / tmp /teststring-e3FNx4.o -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed / usr / lib / gcc / i686-linux -gnu / 4.6 / crtend.o /usr/lib/gcc/i686-linux-gnu/4.6/../../../i386-linux-gnu/crtn.o
/tmp/teststring-e3FNx4.o：在函数main':
teststring.cpp:(.text+0x18): undefined reference to main':
teststring.cpp:(.text+0x18): undefined reference to main':
teststring.cpp:(.text+0x18): undefined reference to std :: basic_string，std :: allocator的main':
teststring.cpp:(.text+0x18): undefined reference to

:: basic_string（）'teststring.cpp :(。text + 0x2b）：对std::string::operator+=(char const*)' teststring.cpp:(.text+0x3e): undefined reference to std的std::string::operator+=(char const*)' teststring.cpp:(.text+0x3e): undefined reference to ： ：basic_string，std :: allocator> :: ~basic_string（）'teststring.cpp :(。text + 0x58）：未定义引用std::basic_string<char, std::char_traits<char>, std::allocator<char> ::~basic_string()' teststring.cpp:(.text+0x79): undefined reference to std :: terminate（）的未定义引用'/tmp/teststring-e3FNx4.o:(.eh_frame+0x13）：未定义引用`__gxx_personality_v0 'clang：错误：链接器命令失败，退出代码为1（使用-v查看调用）

PS好奇的节目是：

#include <string>
int main()
{
        std::string s;
        s+="banana";
}

Answer 1

这是C ++代码，因此请尝试使用clang++而不是clang以便链接C ++标准库。