[LLVMbugs] [Bug 21626] clang failed to compile Objective-C++ code with -fmodules

Sun Nov 23 17:58:05 PST 2014

http://llvm.org/bugs/show_bug.cgi?id=21626

jh <191919 at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|INVALID                     |---

--- Comment #6 from jh <191919 at gmail.com> ---
> The point of [extern_c] is twofold: (1) it builds the
> target module in an implicit extern "C" context (which
> affects its semantics in lots of ways), and (2) it
> allows the module to be imported in an extern "C"
> context. You don't want (2) without (1), because that
> can lead to silent and hard-to-diagnose build breaks.

Thank you for the explanation.

I don't know whether it is correct: `module` works like precompiled headers
which works fine without [extern_c]. Since `extern "C"` is a linkage, i.e., it
is used in link-time, and the linker works fine with current defines in
headers, why another marker is needed at compile-time?

> The next problem is with the CoreFoundation module map.
> Again, this is an Apple problem not a Clang one. The
> reason why this "works" with XCode 6.1 is that -fmodules
> does nothing in C++ mode there.

> Ultimately, the problem is that the module maps you're
> using have not been made to work with C++, and they don't.

I have modified all module maps in OS X SDK and recompile the code, this time
the header-file-scattering problem.

In OS X/iOS SDK, header files in one framework could be in another framework,
for example: IORegistryEntry.h belongs to IOKit，but it is placed under
Kernel.framework. I know this is Apple's problem, too, but the old question:
without `-fmodules`, the compiler works fine with locating the file in both
objective-C and C++ mode.

```
While building module 'Cocoa' imported from m.mm:1:
While building module 'Foundation' imported from
/System/Library/Frameworks/Cocoa.framework/Headers/Cocoa.h:12:
While building module 'CoreGraphics' imported from
/System/Library/Frameworks/Foundation.framework/Headers/NSGeometry.h:12:
While building module 'IOKit' imported from
/System/Library/Frameworks/CoreGraphics.framework/Headers/CGDisplayConfiguration.h:8:
In file included from <module-includes>:126:
/System/Library/Frameworks/IOKit.framework/Headers/video/IOVideoDevice.h:12:10:
fatal error: 'IOKit/IOService.h' file not found
#include <IOKit/IOService.h>
         ^
While building module 'Cocoa' imported from m.mm:1:
While building module 'Foundation' imported from
/System/Library/Frameworks/Cocoa.framework/Headers/Cocoa.h:12:
While building module 'CoreGraphics' imported from
/System/Library/Frameworks/Foundation.framework/Headers/NSGeometry.h:12:
In file included from <module-includes>:1:
In file included from
/System/Library/Frameworks/CoreGraphics.framework/Headers/CoreGraphics.h:41:
/System/Library/Frameworks/CoreGraphics.framework/Headers/CGDisplayConfiguration.h:8:10:
fatal error: could not build module 'IOKit'
#include <IOKit/IOKitLib.h>
 ~~~~~~~~^
While building module 'Cocoa' imported from m.mm:1:
While building module 'Foundation' imported from
/System/Library/Frameworks/Cocoa.framework/Headers/Cocoa.h:12:
While building module 'CoreGraphics' imported from
/System/Library/Frameworks/Foundation.framework/Headers/NSGeometry.h:12:
While building module 'IOSurface' imported from
/System/Library/Frameworks/CoreGraphics.framework/Headers/CGDisplayStream.h:9:
In file included from <module-includes>:1:
In file included from
/System/Library/Frameworks/IOSurface.framework/Headers/IOSurface.h:13:
/System/Library/Frameworks/IOSurface.framework/Headers/IOSurfaceAPI.h:12:10:
fatal error: could not build module 'IOKit'
#include <IOKit/IOKitLib.h>
 ~~~~~~~~^
While building module 'Cocoa' imported from m.mm:1:
While building module 'Foundation' imported from
/System/Library/Frameworks/Cocoa.framework/Headers/Cocoa.h:12:
In file included from <module-includes>:1:
In file included from
/System/Library/Frameworks/Foundation.framework/Headers/Foundation.h:42:
In file included from
/System/Library/Frameworks/Foundation.framework/Headers/NSKeyedArchiver.h:8:
/System/Library/Frameworks/Foundation.framework/Headers/NSGeometry.h:12:9:
fatal error: could not build module 'CoreGraphics'
#import <CoreGraphics/CGBase.h>
 ~~~~~~~^
While building module 'Cocoa' imported from m.mm:1:
While building module 'Foundation' imported from
/System/Library/Frameworks/Cocoa.framework/Headers/Cocoa.h:12:
While building module 'CoreServices' imported from
/System/Library/Frameworks/Foundation.framework/Headers/NSURLError.h:12:
While building module 'DiskArbitration' imported from
/System/Library/Frameworks/CoreServices.framework/Frameworks/CarbonCore.framework/Headers/Files.h:56:
In file included from <module-includes>:1:
In file included from
/System/Library/Frameworks/DiskArbitration.framework/Headers/DiskArbitration.h:29:
/System/Library/Frameworks/DiskArbitration.framework/Headers/DADisk.h:28:10:
fatal error: could not build module 'IOKit'
#include <IOKit/IOKitLib.h>
 ~~~~~~~~^
While building module 'Cocoa' imported from m.mm:1:
While building module 'Foundation' imported from
/System/Library/Frameworks/Cocoa.framework/Headers/Cocoa.h:12:
While building module 'CoreServices' imported from
/System/Library/Frameworks/Foundation.framework/Headers/NSURLError.h:12:
In file included from <module-includes>:1:
In file included from
/System/Library/Frameworks/CoreServices.framework/Headers/CoreServices.h:23:
In file included from
/System/Library/Frameworks/CoreServices.framework/Frameworks/AE.framework/Headers/AE.h:20:
In file included from
/System/Library/Frameworks/CoreServices.framework/Frameworks/CarbonCore.framework/Headers/CarbonCore.h:87:
In file included from
/System/Library/Frameworks/CoreServices.framework/Frameworks/CarbonCore.framework/Headers/Components.h:26:
/System/Library/Frameworks/CoreServices.framework/Frameworks/CarbonCore.framework/Headers/Files.h:56:10:
fatal error: could not build module 'DiskArbitration'
#include <DiskArbitration/DADisk.h>
 ~~~~~~~~^
While building module 'Cocoa' imported from m.mm:1:
While building module 'Foundation' imported from
/System/Library/Frameworks/Cocoa.framework/Headers/Cocoa.h:12:
While building module 'ApplicationServices' imported from
/System/Library/Frameworks/Foundation.framework/Headers/NSAppleEventDescriptor.h:7:
In file included from <module-includes>:1:
/System/Library/Frameworks/ApplicationServices.framework/Headers/ApplicationServices.h:23:10:
fatal error: could not build module 'CoreServices'
#include <CoreServices/CoreServices.h>
 ~~~~~~~~^
While building module 'Cocoa' imported from m.mm:1:
While building module 'Foundation' imported from
/System/Library/Frameworks/Cocoa.framework/Headers/Cocoa.h:12:
While building module 'ApplicationServices' imported from
/System/Library/Frameworks/Foundation.framework/Headers/NSAppleEventDescriptor.h:7:
While building module 'CoreText' imported from
/System/Library/Frameworks/ApplicationServices.framework/Frameworks/ATS.framework/Headers/SFNTLayoutTypes.h:16:
In file included from <module-includes>:1:
In file included from
/System/Library/Frameworks/ApplicationServices.framework/Frameworks/CoreText.framework/Headers/CoreText.h:21:
In file included from
/System/Library/Frameworks/CoreText.framework/Headers/CTFont.h:21:
/System/Library/Frameworks/CoreText.framework/Headers/CTFontDescriptor.h:28:10:
fatal error: could not build module 'CoreGraphics'
#include <CoreGraphics/CGAffineTransform.h>
 ~~~~~~~~^
While building module 'Cocoa' imported from m.mm:1:
While building module 'Foundation' imported from
/System/Library/Frameworks/Cocoa.framework/Headers/Cocoa.h:12:
While building module 'ApplicationServices' imported from
/System/Library/Frameworks/Foundation.framework/Headers/NSAppleEventDescriptor.h:7:
While building module 'ImageIO' imported from
/System/Library/Frameworks/ApplicationServices.framework/Headers/ApplicationServices.h:47:
In file included from <module-includes>:1:
In file included from
/System/Library/Frameworks/ApplicationServices.framework/Frameworks/ImageIO.framework/Headers/ImageIO.h:16:
/System/Library/Frameworks/ImageIO.framework/Headers/CGImageSource.h:14:10:
fatal error: could not build module 'CoreGraphics'
#include <CoreGraphics/CoreGraphics.h>
 ~~~~~~~~^
While building module 'Cocoa' imported from m.mm:1:
In file included from <module-includes>:1:
/System/Library/Frameworks/Cocoa.framework/Headers/Cocoa.h:12:9: fatal error:
could not build module 'Foundation'
#import <Foundation/Foundation.h>
 ~~~~~~~^
While building module 'Cocoa' imported from m.mm:1:
While building module 'AppKit' imported from
/System/Library/Frameworks/Cocoa.framework/Headers/Cocoa.h:13:
In file included from <module-includes>:1:
/System/Library/Frameworks/AppKit.framework/Headers/AppKit.h:10:9: fatal error:
could not build module 'Foundation'
#import <Foundation/Foundation.h>
 ~~~~~~~^
While building module 'Cocoa' imported from m.mm:1:
While building module 'AppKit' imported from
/System/Library/Frameworks/Cocoa.framework/Headers/Cocoa.h:13:
While building module 'QuartzCore' imported from
/System/Library/Frameworks/AppKit.framework/Headers/NSColor.h:36:
In file included from <module-includes>:1:
In file included from
/System/Library/Frameworks/QuartzCore.framework/Headers/CAAnimation.h:6:
In file included from
/System/Library/Frameworks/QuartzCore.framework/Headers/CALayer.h:6:
In file included from
/System/Library/Frameworks/QuartzCore.framework/Headers/CAMediaTiming.h:6:
/System/Library/Frameworks/QuartzCore.framework/Headers/CABase.h:17:10: fatal
error: could not build module 'ApplicationServices'
#include <ApplicationServices/ApplicationServices.h>
 ~~~~~~~~^
While building module 'Cocoa' imported from m.mm:1:
While building module 'AppKit' imported from
/System/Library/Frameworks/Cocoa.framework/Headers/Cocoa.h:13:
While building module 'QuartzCore' imported from
/System/Library/Frameworks/AppKit.framework/Headers/NSColor.h:36:
While building module 'CoreVideo' imported from
/System/Library/Frameworks/QuartzCore.framework/Headers/CAOpenGLLayer.h:7:
In file included from <module-includes>:1:
In file included from
/System/Library/Frameworks/CoreVideo.framework/Headers/CoreVideo.h:25:
/System/Library/Frameworks/CoreVideo.framework/Headers/CVDisplayLink.h:24:10:
fatal error: could not build module 'ApplicationServices'
#include <ApplicationServices/ApplicationServices.h>
 ~~~~~~~~^
While building module 'Cocoa' imported from m.mm:1:
While building module 'AppKit' imported from
/System/Library/Frameworks/Cocoa.framework/Headers/Cocoa.h:13:
While building module 'CoreData' imported from
/System/Library/Frameworks/AppKit.framework/Headers/NSPredicateEditorRowTemplate.h:12:
In file included from <module-includes>:1:
/System/Library/Frameworks/CoreData.framework/Headers/CoreData.h:8:9: fatal
error: could not build module 'Foundation'
#import <Foundation/Foundation.h>
 ~~~~~~~^
m.mm:1:9: fatal error: could not build module 'Cocoa'
#import <Cocoa/Cocoa.h>
 ~~~~~~~^
15 errors generated.
```

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