Re: Link to C++ library

[Pascal Bourguignon]

> From: "Yen-Ju Chen" <yjchenx@hotmail.com>
> Date: Tue, 10 Sep 2002 15:52:52 -0400
> 
> Hi,
> 
>   I try to use the id3lib (http://www.id3lib.org),
>   which is a C++ library, but offer the C interface.
>   But I met a problem about linking between id3lib and standard C++ library.
>   Is it possible to use such C++ library with C interface in GNUstep ?
> 
>   Yen-Ju


I  do  link  routinely   C++  libraries  into  GNUstep  /  Objective-C
applications without any problem, passing thru a C interface.

Here  is an example  of GNUmakefile  I used  lately. The  only notable
thing  is  the  use  of  the  g++ compiler  (CC=g++)  to  compile  the
MyCppLibCalls.c  file, which  contains  only simple  C functions  each
sending  a message  to a  C++ object  from libMyCppLib.a,  which  is a
library of C++ objects.

------------------------------------------------------------------------
include $(GNUSTEP_SYSTEM_ROOT)/Makefiles/common.make
#GNUSTEP_INSTALLATION_DIR = $(GNUSTEP_USER_ROOT)
GNUSTEP_INSTALLATION_DIR=$(INSTALLDIR)

OBJCFLAGS += -g -Wall -DUNIX #-DSTRICT_OPENSTEP
CFLAGS    += -g -Wall -DUNIX #-DSTRICT_OPENSTEP
# (For now, the compilation on GNUstep with STRICT_OPENSTEP is broken).

ADDITIONAL_INCLUDE_DIRS = \
        -I. \
        -IUtilities.subproj \
        -I$(INSTALLDIR) \
        -I$(INSTALLDIR)/MyCppLib/interfaces 

CC=g++

-include GNUmakefile.preamble


SUBPROJECTS=\
        Utilities.subproj 

include $(GNUSTEP_SYSTEM_ROOT)/Makefiles/aggregate.make


APP_NAME=YyyyTest
YyyyTest_PRINCIPAL_CLASS=YyyyTest
YyyyTest_APPLICATION_ICON=icon.tiff
YyyyTest_RESOURCE_FILES=$(YyyyTest_APPLICATION_ICON)
YyyyTest_RESOURCE_DIRS=
YyyyTest_SUBPROJECTS=$(SUBPROJECTS)
YyyyTest_OTHER_LIBRARIES=\
        $(INSTALLDIR)/MyCppLib/libraries/libMyCppLib.a \
        /usr/lib/libmcheck.a
YyyyTest_TOOL_LIBS=$(YyyyTest_OTHER_LIBRARIES)
YyyyTest_LIB_DIRS=
YyyyTest_C_FILES=\
        MyCppLibCalls.c
YyyyTest_OBJC_FILES=\
        YyyyTest_main.m \
        YyyyTest.m \
        YyyyCLog.m \
        YyyyCTree.m \
        YyyyVTree.m \
        YyyyDictionary.m \
        YyyyObject.m \
                YyyyLogToCallBack.m \
                YyyyFileDS.m \
                YyyyReference.m \
                YyyyElement.m \
                YyyyTree.m 


include $(GNUSTEP_SYSTEM_ROOT)/Makefiles/application.make

-include GNUmakefile.postamble

#END#
------------------------------------------------------------------------

-- 
__Pascal_Bourguignon__                   http://www.informatimago.com/
----------------------------------------------------------------------
 The name is Baud,...... James Baud.