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POboost::variant linker error with gcc
 

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  1. POboost::variant linker error with gcc
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    <p>I am going a bit nuts trying to figure out why the following won't compile:</p> <pre><code>#include &lt;iostream&gt; #include &lt;array&gt; #include &lt;boost/variant.hpp&gt; #include &lt;forward_list&gt; typedef unsigned long long very_long; typedef boost::variant&lt; int, std::string &gt; variants_type; typedef std::array&lt; variants_type, 5 &gt; row_type; typedef std::forward_list&lt;row_type&gt; rows_holder_type; int main() { rows_holder_type rows; row_type row_data; row_data[0] = 0; row_data[1] = 0; row_data[2] = 0; row_data[3] = 0; row_data[4] = 0; rows.push_front(row_data); } </code></pre> <p>This is the compiler error I am getting:</p> <blockquote> <p>/usr/include/testing/test_code.o||In function <code>'std::array&lt;boost::variant&lt;int, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt;, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_&gt;, 5ul&gt;::array(std::array&lt;boost::variant&lt;int, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt;, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_&gt;, 5ul&gt; const&amp;)'</code>:|<br> store.cpp:(.text._ZNSt5arrayIN5boost7variantIiSsNS0_6detail7variant5void_ES4_S4_S4_S4_S4_S4_S4_S4_S4_S4_S4_S4_S4_S4_S4_S4_S4_EELm5EEC2ERKS6_[_ZNSt5arrayIN5boost7variantIiSsNS0_6detail7variant5void_ES4_S4_S4_S4_S4_S4_S4_S4_S4_S4_S4_S4_S4_S4_S4_S4_S4_EELm5EEC5ERKS6_]+0x31)||undefined reference to <code>'boost::variant&lt;int, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt;, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_&gt;::variant(boost::variant&lt;int, std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt;, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_&gt; const&amp;)'</code>|<br> ||=== Build finished: 1 errors, 0 warnings ===|</p> </blockquote> <p>If I replace:</p> <pre><code>typedef boost::variant&lt; int, std::string &gt; variants_type; </code></pre> <p>with:</p> <pre><code>typedef boost::any variants_type; </code></pre> <p>The code compiles, but I do not want to use boost::any for performance reasons.</p>
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    1. COIt does compile, that is a linker error.
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      1. UShmjd
    2. COAny suggestion on how to fix it? I'm googling how to fix linker errors as we speak, but have yet to run into the solution.
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      1. USuser396404
    3. CO'fraid not. I have never used `boost::variant`. A lot of the boost stuff is header only, so no need to link anything, but not everything. The `boost::regex` is an example of that, which you need to build a library and then link with it.
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      1. POboost::variant linker error with gcc
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