Re: mix of c and C++

[sagar Guledagudda <sagu072 () gmail com>]

Thank you, i have solved the problem by compling with   -DHAVE_CONFIG_H flag
.
Regards
Sagar.
On Tue, Jul 19, 2011 at 11:53 AM, Helge Kruse <Helge.Kruse-nospam () gmx net>wrote:

> Am 19.07.2011 07:10, schrieb sagar Guledagudda:
>
> I am compiling it for linux ( xxx.so file )
> > Includes files are as below
> >
> > #ifdef HAVE_CONFIG_H
> > # include "config.h"
> > #endif
> > #include<stdio.h>
> > #include<glib.h>
> > #include<epan/packet.h>
> > //      fastfix API
> > #include<fastapi.h>
> > #include<string.h>
> >
> >
> >
> > CC   = g++
> >
> > CFLAGS = $(INCS)  -fPIC
> >
> > $(PLUGIN) : $(OBJS)
> >         mkdir -p $(PLUGIN_DIR)
> >         $(CC) -shared $(OBJS) $(LIBS)-o $@
> > %.o : %.cpp
> >         $(CC) $(CFLAGS) $(LIBS) $<  -o $@
>
> A Unix shared library exports all non-private symbols while a Windows
> dynamic link library exports only the symbols that are defined in the export
> list. To access variables in the Wireshark.so you need to declare the symbol
> 'extern'. You need to declare the symbol as '__declspec(dllimport) extern'
> to access it in the Wireshark.dll.
> The config.h defines a macro WS_VAR_IMPORT with the appropriate definition.
>
> If you don't include the config.h WS_VAR_IMPORT is not replaced with
> anything and your compiler gets confused. If your curious you can check this
> by *temporarily* change the actual compiler flags and replace -c by -E to
> get a preprocessed source file. Look for WS_VAR_IMPORT or _NEED_VAR_IMPORT_
> in that file.
>
> To solve your problem you should define HAVE_CONFIG_H, probably with
>
>   CFLAGS = $(INCS) -fPIC -DHAVE_CONFIG_H
>
> But the makefiles are usually autogenerated.
>
> @all: What is the sense behind the HAVE_CONFIG_H if I need it anyway?
>
>
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