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POStrange warnings from the linker (ld)
 

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    <p>We are building a Mac OSX application which is written mostly in Obj-C/Cocoa. The application then statically links with some 3rd party libraries, written in C/C++ and compiled by us (on a command line, using either MacPorts or the usual "./configure &amp;&amp; make"; all are universal binaries).</p> <p>The application is working perfectly, but ad compile time we are always getting these strange linker warnings:</p> <pre><code>ld: warning: direct access in ___cxx_global_var_init17 to global weak symbol __ZGVN4i18n12phonenumbers9SingletonINS0_15PhoneNumberUtilEE8instanceE means the weak symbol cannot be overridden at runtime. This was likely caused by different translation units being compiled with different visibility settings. ld: warning: direct access in ___cxx_global_var_init17 to global weak symbol __ZGVN4i18n12phonenumbers9SingletonINS0_15PhoneNumberUtilEE8instanceE means the weak symbol cannot be overridden at runtime. This was likely caused by different translation units being compiled with different visibility settings. ld: warning: direct access in ___cxx_global_var_init17 to global weak symbol __ZN5boost10scoped_ptrIN4i18n12phonenumbers15PhoneNumberUtilEED1Ev means the weak symbol cannot be overridden at runtime. This was likely caused by different translation units being compiled with different visibility settings. ld: warning: direct access in ___cxx_global_var_init17 to global weak symbol __ZN4i18n12phonenumbers9SingletonINS0_15PhoneNumberUtilEE8instanceE means the weak symbol cannot be overridden at runtime. This was likely caused by different translation units being compiled with different visibility settings. ld: warning: direct access in ___cxx_global_var_init17 to global weak symbol __ZGVN4i18n12phonenumbers9SingletonINS0_15PhoneNumberUtilEE8instanceE means the weak symbol cannot be overridden at runtime. This was likely caused by different translation units being compiled with different visibility settings. </code></pre> <p>This comes from a C/C++ library. We are linking with these libs:</p> <ol> <li><a href="http://code.google.com/p/libphonenumber/" rel="nofollow noreferrer">libphonenumber</a>, which is the one causing 4 of the 5 warnings, apparently. Compiled by us via "cmake".</li> <li>boost (libboost_thread-mt), responsible of 1 warning. Compiled with MacPorts.</li> <li>ICU (libicudata, libicuuc, libicui18n), compiled with MacPorts.</li> <li><a href="http://code.google.com/p/protobuf/" rel="nofollow noreferrer">Protocol Buffers</a>, compiled via "./configure &amp;&amp; make".</li> </ol> <p>Please note:</p> <ol> <li>The application is working perfectly despite the warnings, but we'd like to get rid of them as they are annoying.</li> <li>The solution proposed by <a href="https://stackoverflow.com/questions/8685045/xcode-with-boost-linkerid-warning-about-visibility-settings">xcode with boost : linker(Id) Warning about visibility settings</a> doesn't work: "Symbols hidden by default" has always been "YES".</li> </ol>
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    1. COyou can make libphonenumber smaller by using the "re2" regex library instead of the full ICU one by using the C Flag `-DUSE_RE2=1`
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      1. POStrange warnings from the linker (ld)
      1. USMatt Connolly
    2. CO@MattConnolly isn't ICU still required? It can use re2 for the regex, but it still requires ICU for other things... Eventually, I found a "solution". It's definitely a dirty one, but works: use the JS (yes, JavaScript) version and call it from Cocoa. It's also faster than what I expected it to be!
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    3. COYou can link to the iOS provided icucore library. Don't you need to set up a webview to run javascript? If it's using the v8 optimiser, it could be ok... I'll git it a look too.
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