Re: Symbol not found when compiling MM (ObjC++) file
Re: Symbol not found when compiling MM (ObjC++) file
- Subject: Re: Symbol not found when compiling MM (ObjC++) file
- From: Kyle Sluder <email@hidden>
- Date: Fri, 05 Aug 2011 21:02:28 -0700
On Aug 5, 2011, at 7:57 AM, Alexander Hartner <email@hidden> wrote:
>
> Logger.h
>
> #import <Foundation/Foundation.h>
> void ABSLogToggle (BOOL debug);
> void ABSLog (NSString *format,...);
[snip]
>
> Now when I import Logger.h and use it from a Objective C (.m) file everything seems to work great. However as soon I as import it and use it from a Objective C++ (.mm) file I get the following link error:
>
> Ld [REMOVED] normal i386
> setenv MACOSX_DEPLOYMENT_TARGET 10.4
> /Developer/usr/bin/g++-4.0 -arch i386 -dynamiclib -isysroot /Developer/SDKs/MacOSX10.4u.sdk -L[REMOVED]/Release -F[REMOVED]/Release -filelist [REMOVED].LinkFileList -install_name [REMOVED] -mmacosx-version-min=10.4 -framework Foundation -framework Cocoa -framework SyncServices -framework Foundation -framework IOKit -lcrypto.0.9.7 -lssl.0.9.7 -single_module -compatibility_version 1 -current_version 9 -o [REMOVED]
>
> Undefined symbols:
> "ABSLog(NSString*, ...)", referenced from:
> -[SoapAdaptor initWithPreferences:] in SoapAdaptor.o
> ld: symbol(s) not found
> collect2: ld returned 1 exit status
You need to wrap the contents of your header file with `extern "C"` when building C++:
#import <Foundation/Foundation.h>
#ifdef __cplusplus
extern "C" {
#endif
void ABSLogToggle(BOOL debug);
void ABSLog(NSString *format,...);
#ifdef __cplusplus
}
#endif
--Kyle Sluder_______________________________________________
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