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POXcode: Referencing C++ project from Objective-C project
 

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  1. POXcode: Referencing C++ project from Objective-C project
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    <p>I'm beginning to tear my hair out over this, so it's time to post here!</p> <p>I have a C++ project in XCode, built as a Command Line Tool. All .cpp files have been renamed as .mm, there is one .hh and a few .h headers. I've specified 'Compile Sources As -> Objective-C++' in Build Settings.</p> <p>I have another XCode project for an iOS app. This is set to 'Compile Sources As -> According to File Type'. I can't set it to compile everything as Objective-C++ since some parts of the project won't compile as Obj-C++.</p> <p>There is one class in the iOS app where I wish to utilise my C++ project, and it consists of files MyClass.hh, MyClass.mm; they were simply .h and .m but I renamed them in the hope of remedying this problem.</p> <p>I dragged my cpp project into the iOS project. I then added a Target Dependency in the iOS Build Phases to point to the cpp CLI application.</p> <p>In MyClass.hh I have</p> <pre><code>#include "../path/to/CppProject/ImportAll.h" </code></pre> <p>..which is a header file that successively 'include's all headers from the cpp project. I then go about my business, creating one property within MyClass.hh which is a pointer to a cpp object, and various references within MyClass.mm to cpp classes.</p> <p>The darn thing just won't compile though - I get a ton of messages relating to my cpp classes like this:</p> <pre><code>MyCPPFile.h:10: error: expected '=', ',', ';', 'asm' or '__attribute__' before '&lt;' token </code></pre> <p>Is the compiler not recognising that MyClass.hh is Objective-C++ not Objective-C? Should I have a target dependency which is a library instead of pointing to this CLI app, perhaps?</p> <p>I've googled around for a while trying to solve the problem. I've seen references to people using</p> <pre><code>#ifdef __cplusplus </code></pre> <p>or else having to rename files to .mm to get things working, but in other cases people simply say they drag and drop projects across with no issues.</p> <p>Can someone please enlighten me, and explain what key steps I should be performing to make this work? I'd be very grateful! Thank you.</p>
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    1. COAre you sure you don't have any .m (as opposed to .mm) files around? This kind of errors is usually caused by including c++ headers into Obj-C (not Obj-C++) source files.
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