Re: Linking agent against a C++ application

OK I've fixed it. All you need to be able to link the agent in to a C++ 
application, is a small change to the Makefiles in the agent and apps 
directories. When linking the Makefile needs to give g++ as the first 
"argument" to libtool, rather than gcc. Below is a patch file for fixing 
the two make files. Note this isn't a patch on the NetSNMP distribution, 
but on the Makefiles themselves, so you'll need to run the patch twice - 
once on each of the two Makefiles. Note also that the NetSNMP Makefiles 
are autogenerated by the ./configure command, so you'll need to repatch 
the makefiles every time you do ./configure.

Given the number of times that C++ has come up before on this list, I 
hope this fix will be useful to folk!

The real fix for this needs the code which autogenerates the Makefiles 
to be changed, so that ./configure produces the patched version of the 
Makefiles. Once that's done, NetSNMP should work with C++ out of the 
box. All the application developer then needs to do is provide a C 
wrapper interface around the C++ application, which the agent can then use.

I hope this helps. Cheers

Raffles

--- Makefile	2006-01-27 11:28:49.245467235 +0000
+++ Makefile.bis	2006-01-27 11:29:57.149984444 +0000
@@ -51,6 +51,7 @@

  # Misc Compiling Stuff
  CC	        = gcc
+LINKCC	        = g++

  # use libtool versioning the way they recommend.
  # The (slightly clarified) rules:
@@ -68,11 +69,11 @@
  LIBAGE      = 0
  LIBREVISION = 0

-LIB_LD_CMD      = $(LIBTOOL) --mode=link $(CC) $(CFLAGS) -rpath 
$(libdir) -version-info $(LIBCURRENT):$(LIBREVISION):$(LIBAGE) -o
+LIB_LD_CMD      = $(LIBTOOL) --mode=link $(LINKCC) $(CFLAGS) -rpath 
$(libdir) -version-info $(LIBCURRENT):$(LIBREVISION):$(LIBAGE) -o
  LIB_EXTENSION   = la
  LIB_VERSION     =
  LIB_LDCONFIG_CMD = $(LIBTOOL) --mode=finish $(libdir)
-LINK		= $(LIBTOOL) --mode=link $(CC)
+LINK		= $(LIBTOOL) --mode=link $(LINKCC)
  # RANLIB 	= ranlib
  RANLIB		= :


Raffles wrote:
> Hi There,
> 
> I'm trying to use NetSNMP to monitor a software system which is written 
> in C++.
> 
> I've created a C wrapper for the API to the C++ application, and written 
> a mib2c config file to generate code which calls the API to get/set the 
> information it needs. I've stuck the mib2c output into the 
> agent/mibgroup directory and ./configured NetSNMP to use my MIBs.
> 
> When I do the top level make, everything compiles fine, but it doesn't 
> link. The problem is that the linker is wondering what on earth "new" 
> and "delete" are, not to mention autogenerated identifiers to do with 
> virtual tables. As far as I can see the only problem here is that the 
> makefile needs to do C++ linking, not C linking. However, I couldn't see 
> any way to specify the linker in the config file.
> 
> I noticed that the linktool file is auto-generated, so presumably there 
> is a way to fix this in the configure script (which presumably 
> auto-generates it)? Any other solutions also welcome.
> 
> I tried trawling through the archives, and found lots of C++ type 
> questions, but none which answered this one. If I missed it, just point 
> me =)
> 
> Thanks in advance.
> 
> Raffles
> 

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