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POCMake not working with C++11 on OSX
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  1. POCMake not working with C++11 on OSX
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    copied!<p>I've just upgraded to Mountain Lion so I can use some of the C++11 features on the new version of Clang that comes with xcode. I'm using cmake 2.8.9 from Homebrew.</p> <p>I've made a very simple CMake project which adds the compiler flags for C++11:</p> <pre><code># CMakeLists.txt cmake_minimum_required(VERSION 2.8) add_executable(test test.cxx) add_definitions(-std=c++0x -stdlib=libc++) </code></pre> <p>where the C++ code in test.cxx is the following:</p> <pre><code>#include &lt;iostream&gt; int main() { std::cout &lt;&lt; "Howdy" &lt;&lt; std::endl; return 0; } </code></pre> <p>When running cmake and make, the file compiles just fine but then the linker outputs the following errors:</p> <pre><code>Linking CXX executable test Undefined symbols for architecture x86_64: "std::__1::locale::use_facet(std::__1::locale::id&amp;) const", referenced from: std::__1::basic_ostream&lt;char, std::__1::char_traits&lt;char&gt; &gt;&amp; std::__1::endl&lt;char, std::__1::char_traits&lt;char&gt; &gt;(std::__1::basic_ostream&lt;char, std::__1::char_traits&lt;char&gt; &gt;&amp;) in test.cxx.o "std::__1::ios_base::getloc() const", referenced from: std::__1::basic_ostream&lt;char, std::__1::char_traits&lt;char&gt; &gt;&amp; std::__1::endl&lt;char, std::__1::char_traits&lt;char&gt; &gt;(std::__1::basic_ostream&lt;char, std::__1::char_traits&lt;char&gt; &gt;&amp;) in test.cxx.o "std::__1::basic_ostream&lt;char, std::__1::char_traits&lt;char&gt; &gt;::put(char)", referenced from: std::__1::basic_ostream&lt;char, std::__1::char_traits&lt;char&gt; &gt;&amp; std::__1::endl&lt;char, std::__1::char_traits&lt;char&gt; &gt;(std::__1::basic_ostream&lt;char, std::__1::char_traits&lt;char&gt; &gt;&amp;) in test.cxx.o "std::__1::basic_ostream&lt;char, std::__1::char_traits&lt;char&gt; &gt;::flush()", referenced from: std::__1::basic_ostream&lt;char, std::__1::char_traits&lt;char&gt; &gt;&amp; std::__1::endl&lt;char, std::__1::char_traits&lt;char&gt; &gt;(std::__1::basic_ostream&lt;char, std::__1::char_traits&lt;char&gt; &gt;&amp;) in test.cxx.o "std::__1::basic_ostream&lt;char, std::__1::char_traits&lt;char&gt; &gt;::sentry::sentry(std::__1::basic_ostream&lt;char, std::__1::char_traits&lt;char&gt; &gt;&amp;)", referenced from: std::__1::basic_ostream&lt;char, std::__1::char_traits&lt;char&gt; &gt;&amp; std::__1::operator&lt;&lt;&lt;std::__1::char_traits&lt;char&gt; &gt;(std::__1::basic_ostream&lt;char, std::__1::char_traits&lt;char&gt; &gt;&amp;, char const*) in test.cxx.o "std::__1::basic_ostream&lt;char, std::__1::char_traits&lt;char&gt; &gt;::sentry::~sentry()", referenced from: std::__1::basic_ostream&lt;char, std::__1::char_traits&lt;char&gt; &gt;&amp; std::__1::operator&lt;&lt;&lt;std::__1::char_traits&lt;char&gt; &gt;(std::__1::basic_ostream&lt;char, std::__1::char_traits&lt;char&gt; &gt;&amp;, char const*) in test.cxx.o "std::__1::cout", referenced from: _main in test.cxx.o "std::__1::ctype&lt;char&gt;::id", referenced from: std::__1::basic_ostream&lt;char, std::__1::char_traits&lt;char&gt; &gt;&amp; std::__1::endl&lt;char, std::__1::char_traits&lt;char&gt; &gt;(std::__1::basic_ostream&lt;char, std::__1::char_traits&lt;char&gt; &gt;&amp;) in test.cxx.o "std::__1::locale::~locale()", referenced from: std::__1::basic_ostream&lt;char, std::__1::char_traits&lt;char&gt; &gt;&amp; std::__1::endl&lt;char, std::__1::char_traits&lt;char&gt; &gt;(std::__1::basic_ostream&lt;char, std::__1::char_traits&lt;char&gt; &gt;&amp;) in test.cxx.o "std::__1::ios_base::__set_badbit_and_consider_rethrow()", referenced from: std::__1::basic_ostream&lt;char, std::__1::char_traits&lt;char&gt; &gt;&amp; std::__1::operator&lt;&lt;&lt;std::__1::char_traits&lt;char&gt; &gt;(std::__1::basic_ostream&lt;char, std::__1::char_traits&lt;char&gt; &gt;&amp;, char const*) in test.cxx.o "std::__1::ios_base::clear(unsigned int)", referenced from: std::__1::basic_ostream&lt;char, std::__1::char_traits&lt;char&gt; &gt;&amp; std::__1::operator&lt;&lt;&lt;std::__1::char_traits&lt;char&gt; &gt;(std::__1::basic_ostream&lt;char, std::__1::char_traits&lt;char&gt; &gt;&amp;, char const*) in test.cxx.o ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) make[2]: *** [test] Error 1 make[1]: *** [CMakeFiles/test.dir/all] Error 2 make: *** [all] Error 2 </code></pre> <p>I get no errors if I comment out the add_definitions line in the CMakeLists.txt file, and I can also avoid errors if I remove the std::cout line in test.cxx. Perhaps the weirdest part of all is that if I simply run</p> <pre><code>clang++ -std=c++0x -stdlib=libc++ test.cxx </code></pre> <p>it compiles just fine! So, following a commentor's advice, I checked the actual commands cmake is running for compiling and linking.</p> <p>Compile:</p> <pre><code>/usr/bin/c++ -std=c++0x -stdlib=libc++ -o CMakeFiles/test.dir/test.cxx.o -c /Users/luis/test.cxx </code></pre> <p>Link:</p> <pre><code>/usr/bin/c++ -Wl,-search_paths_first -Wl,-headerpad_max_install_names CMakeFiles/test.dir/test.cxx.o -o test </code></pre> <p>The main issue now seems to be that the linker is not supplying the proper C++11 flags. Is there a better way to supply these flags so that both the compiler and the linker will use them?</p>
 

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