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copied!<p>Thanks to everyone who gave me suggestions.</p> <p>Having created my projects anew from scratch, I fiddled and logic-ed my way to the solution. Note that - at least in my case - no use of #ifdef __cplusplus was required, nor any other preprocessor directive. Only file suffix changing is essential (as detailed below).</p> <p>Here's the process:</p> <p><strong>Create C++ Static Library and Include/Link with Objective-C Library (e.g. iOS app) in XCode 4</strong>:</p> <ul> <li>In XCode 4 create a New Project of type Cocoa Touch Static Library. Hereafter we shall refer to this project as 'CProj'.</li> <li>In CProj workspace create/import as many C++ classes as required. No special suffix for filenames is necessary - all my files are .h and .cpp.</li> <li>In XCode create/open any Objective-C project e.g. iOS app. Hereafter we shall refer to this project as 'ObjProj'.</li> <li>Find CProj.xcodeproj in Finder (typically /Documents/CProj/CProj.xcodeproj), drag it onto the visible ObjProj project icon at the top of your XCode Project Navigator (visible file/folder hierarchy on left side in XCode). This now places CProj as a nested project within ObjProj.</li> <li>Left click ObjProj project icon in Project Navigator, a new pane emerges to the right, left click Build Phases in this pane.</li> <li>Under Target Dependencies click '+' icon and select CProj library icon below listed CProj project. Click OK.</li> <li>Under Link Binary With Libraries click '+' icon and select CProj library icon from within Workspace collapsible folder at top of window presented.</li> </ul> <p><strong>File Renaming Rules</strong></p> <ul> <li><p>Where including a CProj header in ObjProj, use path backtracking to identify import, e.g. #include "../../MyProj/MyImport.h" to step 2 dirs backwards then step into MyProj folder.</p></li> <li><p>Any ObjProj implementation file including a CProj header must be renamed from .m to .mm . Any ObjProj header file including a CProj header must be renamed from .h to .hh .</p></li> <li><p>Any ObjProj file including a file whose suffix is now .hh (consequence of step above) must be renamed in the same manner.</p></li> </ul> <p><em>An example: Consider you have files A.h, A.m, B.h, B.m. A.m imports B.h, and B.h includes one or more CProj headers. B.m includes type references, using CProj classes included via B.h . First renaming is B.h -> B.hh since it contains includes. Then B.m -> B.mm since it contains type references to CProj (no includes necessary since B.h has already done them). Then A.m -> A.mm since A.m which contained an include for B.h now has an include for the renamed file, B.hh .</em></p> <p>P.S. Note that the C++ library doesn't like to auto-rebuild when it should - I often have to 'Clean' then 'Build' in ObjProj after updating CProj from within it.</p>

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