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POmultiple definition linker error after adding a function to a previously linking file
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  1. POmultiple definition linker error after adding a function to a previously linking file
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    copied!<p>So my program is working fine. Compiling, linking, running, the works. Then, I decide to add a simple function to one of my files, like this:</p> <pre><code>#ifndef UTILITY_HPP #define UTILITY_HPP /* #includes here. There's no circular include, I've checked. */ namespace yarl { namespace utility { (several function declarations and definitions) bool isVowel(const char c) { if(c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u') return true; else return false; } } } #endif </code></pre> <p>That function definition is the only change I've made to my code. Everything else is exactly the same as it was. Nothing calls it yet. I compile, and it fails to link, with g++ giving one of these errors for every file that #includes this one:</p> <pre><code>./obj/Feature.o: In function `yarl::utility::isVowel(char)': /home/max/Desktop/Development/Yarl Backup/yarl v0.27/src/Utility.hpp:130: multiple definition of `yarl::utility::isVowel(char)' ./obj/Events.o:/home/max/Desktop/Development/Yarl Backup/yarl v0.27/src /Utility.hpp:130: first defined here ./obj/GameData.o: In function `yarl::utility::isVowel(char)': </code></pre> <p>If I comment out <code>isVowel</code>, it works again. I've tried renaming it, still doesn't work. I've tried replacing it with just <code>void randomFunctionName() {}</code>, still doesn't work. I've tried making it non-inline and putting the function body in Utility.cpp, still doesn't work. I am extremely confused. Why would adding one simple function screw up the linker?</p>
 

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