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POPrograms compiles in g++ but exits with linker errors in gcc
 

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  1. POPrograms compiles in g++ but exits with linker errors in gcc
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    <p>I'm trying out the <a href="https://stackoverflow.com/questions/1162401/is-it-possible-to-access-values-of-non-type-template-parameters-in-specialized-te/1162910#1162910">solution</a> to a <a href="https://stackoverflow.com/questions/1162401/is-it-possible-to-access-values-of-non-type-template-parameters-in-specialized-te">question about specialized template classes</a>. </p> <p>This code with a compiles fine in g++, but throws up linker errors when compiled with gcc. What's the cause of these errors ? </p> <pre><code>$ g++ traits2.cpp $ gcc traits2.cpp /tmp/ccI7CNCY.o: In function `__static_initialization_and_destruction_0(int, int)': traits2.cpp:(.text+0x36): undefined reference to `std::ios_base::Init::Init()' traits2.cpp:(.text+0x3b): undefined reference to `std::ios_base::Init::~Init()' /tmp/ccI7CNCY.o:(.eh_frame+0x11): undefined reference to `__gxx_personality_v0' collect2: ld returned 1 exit status </code></pre> <p>The traits2.ccp file contains the aforementioned <a href="https://stackoverflow.com/questions/1162401/is-it-possible-to-access-values-of-non-type-template-parameters-in-specialized-te/1162910#1162910">solution</a> with an emtpy main() function:</p> <pre><code>#include &lt;iostream&gt; using namespace std; // A default Traits class has no information template&lt;class T&gt; struct Traits { }; // A convenient way to get the Traits of the type of a given value without // having to explicitly write out the type template&lt;typename T&gt; Traits&lt;T&gt; GetTraits(const T&amp;) { return Traits&lt;T&gt;(); } template &lt;int major, int minor&gt; struct A { void f() { cout &lt;&lt; major &lt;&lt; endl; } }; // Specialisation of the traits for any A&lt;int, int&gt; template&lt;int N1, int N2&gt; struct Traits&lt;A&lt;N1, N2&gt; &gt; { enum { major = N1, minor = N2 }; }; template &lt;&gt; struct A&lt;4,0&gt; { void f() { cout &lt;&lt; "Specialized:" &lt;&lt; GetTraits(*this).major &lt;&lt; endl; } }; int main(int argc, char * argv[] ) { /* A&lt;4,0&gt; p; A&lt;1,2&gt; p2; p.f(); p2.f(); */ return 1; } </code></pre>
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