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POHow to compile C++ under Ubuntu Linux?
 

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  1. POHow to compile C++ under Ubuntu Linux?
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    <p>I cut&amp;pasted the below code from <a href="https://stackoverflow.com/questions/1696225/null-pointer-to-object-problems">a previous question</a> into a file called "avishay.cpp" and then ran </p> <pre><code>gcc avishay.cpp </code></pre> <p>only to get the following error messages from the linker. What went wrong, what should I have done?</p> <pre><code>carl@carl-ubuntu:~/Projects/StackOverflow$ gcc -static avishay.cpp /tmp/cccRNW34.o: In function `__static_initialization_and_destruction_0(int, int)': avishay.cpp:(.text+0x41): undefined reference to `std::ios_base::Init::Init()' avishay.cpp:(.text+0x46): undefined reference to `std::ios_base::Init::~Init()' /tmp/cccRNW34.o: In function `A::func()': avishay.cpp:(.text._ZN1A4funcEv[A::func()]+0x11): undefined reference to `std::cout' avishay.cpp:(.text._ZN1A4funcEv[A::func()]+0x16): 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*)' avishay.cpp:(.text._ZN1A4funcEv[A::func()]+0x1e): 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;)' avishay.cpp:(.text._ZN1A4funcEv[A::func()]+0x26): undefined reference to `std::basic_ostream&lt;char, std::char_traits&lt;char&gt; &gt;::operator&lt;&lt;(std::basic_ostream&lt;char, std::char_traits&lt;char&gt; &gt;&amp; (*)(std::basic_ostream&lt;char, std::char_traits&lt;char&gt; &gt;&amp;))' avishay.cpp:(.text._ZN1A4funcEv[A::func()]+0x36): undefined reference to `std::cout' avishay.cpp:(.text._ZN1A4funcEv[A::func()]+0x3b): undefined reference to `std::basic_ostream&lt;char, std::char_traits&lt;char&gt; &gt;::operator&lt;&lt;(int)' /tmp/cccRNW34.o:(.eh_frame+0x12): undefined reference to `__gxx_personality_v0' collect2: ld returned 1 exit status </code></pre> <p>The C++ code (not my code, I was just trying to run it):</p> <pre><code>#include &lt;iostream&gt; using namespace std; class A { private: int _dmember; public: void func() { cout&lt;&lt;"Inside A!! "&lt;&lt;endl; cout&lt;&lt;_dmember; // crash when reach here. } }; int main () { A* a= NULL; a-&gt;func(); // prints "Inside A!!!" return 1; } </code></pre>
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