Question

I was compiling some c++ program where i have used push_back function. At the end I am getting this error:

/usr/include/c++/4.4/bits/stl_vector.h:741: undefined reference to `std::vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >::**_M_insert_aux**(__gnu_cxx::__normal_iterator<std::basic_string<char, std::char_traits<char>, std::allocator<char> >*, std::vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'

In file stl_vector.h you will find _M_insert_aux but i couldn’t find its definition.

Please suggest to me how to overcome this problem.

Code snippet:

for (table=lex->query_tables; table; table=table->next_global)
{
    string table_db=table->db;
    table_db += ":";
    table_db= table_db+table->table_name;
    current.tables.push_back(table_db);
    DBUG_PRINT("Dip", (" %s: %s, %s",table->db, table->table_name, table->alias));
}

Answer 1

I reproduced this compiler error with the following (main.cpp):

#include <vector>
#include <string>

int main()
{
    std::vector<std::string> v;
    v.push_back(std::string("test"));
    return 0;
}

Compiler command:

g++ -fno-implicit-templates main.cpp -o main

It compiles if -fno-implicit-templates option is not specified.

Check if the compiler flag -fno-implicit-templates is being specified and remove it if possible.

To build with -fno-implicit-templates I changed the source to:

#include <vector>
#include <string>

//class template std::vector<std::string>; TYPO here: 'class' & 'template' wrong order 
template class std::vector<std::string>;

int main()
{
    std::vector<std::string> v;
    v.push_back(std::string("test"));
    return 0;
}

EDIT:

I downloaded mysql 5.1.60 and built it successfully using the configure and make commands you provided in the comment.

I then edited the file “sql_parse.cc” as follows:

// Added these include directives before any other.
#include <vector>
#include <string>

// At the end of include directives added this explicit template
// instantiation.
template class std::vector<std::string>;

// Added the following lines into a random function.
std::vector<std::string> v;
v.push_back(std::string("1"));

I then ran make again and it compiled and linked successfully.
Note I compiled with -fno-implicit-templates: I made no other change to the mysql distribution apart from the ones I made to “sql_parse.cc”.