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POclang: warning: -lgtest: 'linker' input unused
 

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    <p>I'm developing applications in C++11 and my compiler is CLang++ 3.3. I'm also using Netbeans 7.3 IDE on Linux Mint 14.</p> <p>All of my tests are done with GoogleTest (gtest-1.6.0) and almost everything is working fine except the warning mentioned in the title of this post. </p> <p>Here's the command line executed by netbeans as an example:</p> <pre><code>clang++ -pedantic-errors -lgtest -pthread -c -g -Wall -std=c++11 -pedantic-errors -lgtest -pthread -MMD -MP -MF build/Debug/CLang-Linux-x86/_ext/1802678175/main.o.d -o build/Debug/CLang-Linux-x86/_ext/1802678175/main.o ../GIT_CryptoCode/src/main.cpp </code></pre> <p>I don't know why, but the command contains twice some attributes which gives the same warning twice of course. This is what I did in the project properties : <img src="https://i.stack.imgur.com/nKxeB.png" alt="Properties of the project : C++ Compiler"> If I remove the Additional options, gtest is not working and the command line becomes something like this : <code>clang++ -c -g -Wall -std=c++11 ...</code>. What should I do to not get some attributes to be duplicates ?</p> <p>Well, even with cmake, I got the warning with Clang (which appears once this time :)). I also tested with GCC 4.7 and I didn't get any warning. Here's the command line I use in a cmake file for GCC :</p> <pre><code>set (CMAKE_CXX_FLAGS "-Winline -Wall -Werror -pedantic-errors -pthread -std=c++11") </code></pre> <p>Thus, Clang seems to be the problem. Is anyone know where this warning come from and how to remove it ? Is this a Clang bug ?</p> <p>Thanks for your help.</p>
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    1. CO`-lgtest` is a linker instruction to link the gtest library. It shouldn't appear in `CMAKE_CXX_FLAGS`, I'd expect it (or a variable representing it) to appear in something like a `target_link_libraries` call or even `add_executable`. And I don't use NetBeans, but I'd expect this option to fall under the "Linker" menu rather than the "C++ Compiler" menu.
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    2. CO@Fraser you're right. I edited my post to remove the `-lgtest` in the `set` command. Thanks for the comment[+1].
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      1. USGabriel L.
    3. COSo is `-lgtest` gone from the "Additional Options" now? Have you added `gtest` as a dependency in the "Libraries" section?
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