By changing project_OBJC_FILES = main.m
to project_OBJCC_FILES = main.mm and install GNU Objective-C++ compiler fix my problem. Applogize for not being able to expressing my question precisely. Thanks for patentinetly helping fix my problem. ----- Original Message ----- From: David Chisnall Sent: 09/15/13 11:00 PM To: Hungwin Chen Subject: Re: enable c++ You appear to be asking the wrong question. The question that you want to ask is 'how do I specify C++ or Objective-C++ files in a GNUstep Make GNUmakefile?' The useful information that you could have provided up until this point was how you are specifying the files currently. The answer to the question that you mean is to use project_OBJCC_FILES= instead of project_OBJC_FILES (where project is the name of your project). David On 15 Sep 2013, at 15:14, "Hungwin Chen" <[email protected]> wrote: > The project is organized as following structure > > project_root/a/b/{GNUmakefile, main.m, *.pch, ...} > project_root/library/x/{*.h, *.cpp, *.mm, ...} > > In the pch file,preprocessor directive > > #ifdef __cplusplus > ... > #endif > > is added so that the command `make` would compile that source (with other cpp files not recognized). With this scenario, all cpp related files need preprocessor directive added, which looks not a good way to compile a c++ project.So I am learning how to enable c++ so that the project can be compiled without error messages being thrown. > > I tried moving .m file to .mm by e.g. renaming main.m to main.mm but `make' complains the following error > > No rule to make target `obj/Project.obj/main.mm', needed by `Project.app/./Project'. Stop. > > If using main.m make would compile with other c++ sources in library folder not recognized (if no preprocessor directive is added). For instance, > > error: unknown type name ‘class’ > > where in the library folder a header file contains following code > > class A;// <-- error message complains this class is unkown > @protocol AFactory; > @interface AView : NSOpenGLView > > Therefore, I would like to learn how to enable c++ for the entire project, instead of using preprocessor directive. > > Thanks > > > > > >> ----- Original Message ----- >> From: David Chisnall >> Sent: 09/15/13 08:09 PM >> To: Hungwin Chen >> Subject: Re: enable c++ >> >> On 15 Sep 2013, at 13:00, "Hungwin Chen" <[email protected]> wrote: >> >> > At the moment my project compilation is done through preprocessor directive, e.g. >> >> This sentence doesn't make any sense, so it would help if you could explain what you mean by it. >> >> > #ifdef __cplusplus >> > ... >> > #endif >> > >> > However, most of code are c++, passing command `make CC=/usr/bin/g++` dosn't enable gnustep recgonize c++ program. So what parameter should I pass so that the compilation can recognize c++ program? >> >> This will tell it to compile C code with g++, which is almost certainly not what you want. It will use CXX (which hopefully is clang++, but might be g++) for any [Objective-]C++ code. This is identified by the .cc, .C, or .cpp extension for C++ or .mm for Objective-C++. >> >> David >> >> -- Sent from my Apple II >> > -- Sent from my Difference Engine
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