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Forgot to attach error information.Use g++ to compile and link c++ code
hello.o:hello.cpp:(.text+0xd): undefined reference to
`std::basic_string<char, std::char_traits<char>, std::allocator<char>
::size() const'hello.o:hello.cpp:(.text+0x60): undefined reference to
`std::basic_string<char, std::char_traits<char>, std::allocator<char>
::operator[](unsigned int) const'hello.o:hello.cpp:(.text+0x9f): undefined reference to
`std::basic_string<char, std::char_traits<char>, std::allocator<char>
::operator[](unsigned int) const'hello.o:hello.cpp:(.text+0xce): undefined reference to
`std::basic_string<char, std::char_traits<char>, std::allocator<char>
::operator[](unsigned int) const'hello.o:hello.cpp:(.text+0x111): undefined reference to `std::cout'
hello.o:hello.cpp:(.text+0x116): undefined reference to
`std::basic_ostream<char, std::char_traits<char> >& std::operator<<
<std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char>
&, char const*)'hello.o:hello.cpp:(.text+0x11e): undefined reference to
`std::basic_ostream<char, std::char_traits<char> >& std::endl<char,
std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char>
&)'hello.o:hello.cpp:(.text+0x126): undefined reference to
`std::basic_ostream<char, std::char_traits<char>
::operator<<(std::basic_ostream<char, std::char_traits<char> >&
(*)(std::basic_ostream<char, std::char_traits<char> >&))' hello.o:hello.cpp:(.text+0x149): undefined reference to `std::ios_base::Init::Init()' hello.o:hello.cpp:(.text+0x164): undefined reference to `std::ios_base::Init::~Init()' collect2: ld returned 1 exit status
kenny@ca wrote:
Hi there,
I wrote a file, hello.c. It has only one function: print a message like "hello!". ##### hello.c ######### #include<stdio.h> void hello() { printf( "Hello.\n" ) ; }
$gcc -c hello.c $gcc -shared -o hello.dll hello.o
I successufully built it as DLL, hello.dll.
Then, I rewrote it in c++. ##### hello.cpp ####### #include<iostream> using namespace std ; void hello() {cout<< "Hello."<< endl ;}
Then, I used the commands above to built DLL, but it failed. Why did it fail?
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