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POUsing only g++ works, but not "g++ -c" and ld
 

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  1. POUsing only g++ works, but not "g++ -c" and ld
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    <p>I have the following source code in main.cpp:</p> <pre><code>#include &lt;iostream&gt; #include &lt;iomanip&gt; int main() { std::cout &lt;&lt; "Hi" &lt;&lt; std::endl; return 0; } </code></pre> <p>Using this command works, and creates the executable file:</p> <pre><code>g++ -o main main.cpp </code></pre> <p>But this commands don't work:</p> <pre><code>g++ -c main.cpp ld -o main main.o </code></pre> <p>The second one errors with:</p> <pre><code>ld: warning: cannot find entry symbol _start; defaulting to 00000000004000e8 main.o: In function `main': main.cpp:(.text+0xa): undefined reference to `std::cout' main.cpp:(.text+0xf): undefined reference to `std::basic_ostream&lt;char, std::char_traits&lt;char&gt; &gt;&amp; std::operator&lt;&lt; &lt;std::char_traits&lt;char&gt; &gt;(std::basic_ostream&lt;char, std::char_traits&lt;char&gt; &gt;&amp;, char const*)' main.cpp:(.text+0x14): undefined reference to `std::basic_ostream&lt;char, std::char_traits&lt;char&gt; &gt;&amp; std::endl&lt;char, std::char_traits&lt;char&gt; &gt;(std::basic_ostream&lt;char, std::char_traits&lt;char&gt; &gt;&amp;)' main.cpp:(.text+0x1c): undefined reference to `std::ostream::operator&lt;&lt;(std::ostream&amp; (*)(std::ostream&amp;))' main.o: In function `__static_initialization_and_destruction_0(int, int)': main.cpp:(.text+0x4a): undefined reference to `std::ios_base::Init::Init()' main.cpp:(.text+0x4f): undefined reference to `std::ios_base::Init::~Init()' main.cpp:(.text+0x54): undefined reference to `__dso_handle' main.cpp:(.text+0x61): undefined reference to `__cxa_atexit' </code></pre>
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    1. COld does not know about libstdc++
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    2. CODon't call ld directly, unless you really need it.
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      1. USCat Plus Plus
 

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