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Re: I need clarification on limitations of integrating C++ with Obj C

Shawn Erickson wrote: 
On 3/21/06, Rush Manbert <email@hidden> wrote:


The only thing I have done to make this work, is to tell the project to
"Compile Sources As" Objective C++. Maybe you need to do this so that it
will search for standard library headers? (I don't know how this relates
to your source file types. I don't mess with those.)



Changing "Compile Sources As" really shouldn't be needed (it most
common situations). If a file contains Objective-C make it end in
".m". If a file contains C++ make it end in ".cpp". If a file contains
C++ and Objective-C make it end in ".mm". Also if you have aspects of
".h" files that only should be compiled for C++ or Objective-C, etc.
you can wrap them which the appropriate #ifdefs so they are only seen
by the correct compiler (#ifdef __cplusplus, #ifdef __OBJC__, etc.).


It does turn out to be required in this situation because we end up with file.m being compiled and somewhere in its include chain someone includes <string>, but file.m is being compiled as Objective-C, and the compiler can't find the standard lib header.

I changed my library adapter file (the mixed Obj-C/C++ one) to have the mm extension, and I cleared the override on "Compile Sources As". My build failed with this error:

In file included from ../../../../../capo/libraries/inc/libtest/adapterMac/libtestAdapter.h:12,
from /Users/rmanbert/development/iml/capo/tools/capoBrowserMultiWin/mac/capoBrowser/BrowseWindowController.h:12,
from /Users/rmanbert/development/iml/capo/tools/capoBrowserMultiWin/mac/capoBrowser/SourceViewController.m:10:
../../../../../capo/libraries/inc/libtest/libtestApi.h:12:22: error: functional: No such file or directory
../../../../../capo/libraries/inc/libtest/libtestApi.h:13:18: error: string: No such file or directory
../../../../../capo/libraries/inc/libtest/libtestApi.h:14:18: error: vector: No such file or directory

The file being compiled is pure Objective-C as far as it knows, but the include chain brings in the std lib headers, which causes the failure.

I overrode the "Compile Sources As" to say Objective-C++ and the build succeeds.

From the symptoms that I saw after making the change, and the original post, it seems to me that John needs to try overriding the "Compile Sources As" to say Objective-C++.

- Rush
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References: 
 >I need clarification on limitations of integrating C++ with Obj C (From: John Draper <email@hidden>)
 >Re: I need clarification on limitations of integrating C++ with Obj C (From: Rush Manbert <email@hidden>)
 >Re: I need clarification on limitations of integrating C++ with Obj C (From: "Shawn Erickson" <email@hidden>)



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