Re: configure script problem while working on extention

[Guy Harris via tcpdump-workers <tcpdump-workers () lists tcpdump org>]

> --- Begin Message ---
>
>
> From: Guy Harris <gharris () sonic net>
>
> Date: Tue, 16 Aug 2022 13:40:39 -0700
>
> On Aug 16, 2022, at 12:49 PM, Christian <chris () argonautx net> wrote:
>
> > > > configure:6075: checking for pcap_loop
> > > > configure:6075: gcc -o conftest -g -O2   conftest.c -L/usr/local/lib -Wl,-rpath,/usr/local/lib -lpcap  >&5
> > > > /usr/bin/ld: /usr/local/lib/libpcap.so: undefined reference to `scsimon_create'
> > > > /usr/bin/ld: /usr/local/lib/libpcap.so: undefined reference to `scsimon_findalldevs'
> > > Has the pcap.c in the libpcap that was built and installed in /usr/local/lib been modified to add a pcap module 
> > > "scsimon", in addition to your "kpnode" module?
> > >
> > > If so, is there a pcap-scsimon.c, or whatever, that defines them, and was it also added to Makefile.in when the 
> > > library was built?
> >
> > My dumbness again, scsimon is just a synonym for kpnode. This is the actual latest config.log
>
> I.e., that other log was from some *earlier* attempt to configure tcpdump?
>
> > configure:5389: checking whether to look for a local libpcap
> > configure:5410: result: yes
>
> OK, so *this* time you're building with the library from a local build, rather than with a library that was installed.
>
> > configure:5415: checking for local pcap library
> > configure:5445: result: ../libpcap/libpcap.a
> > configure:5908: checking for pcap-config
> > configure:5926: found ../libpcap/pcap-config
> > configure:5938: result: ../libpcap/pcap-config
> > configure:6075: checking for pcap_loop
> > configure:6075: gcc -o conftest -g -O2   conftest.c ../libpcap/libpcap.a   >&5
> > /usr/bin/ld: ../libpcap/libpcap.a(pcap.o):(.data.rel.ro+0x10): undefined reference to `kpnode_findalldevs'
> > /usr/bin/ld: ../libpcap/libpcap.a(pcap.o):(.data.rel.ro+0x18): undefined reference to `kpnode_create'
>
>         ...
>
> > which shows the actual problem, if I evoke nm libpcap.so.1-11.0-PRE-GIT  | grep kpnode
> >
> > I got U kpnode_create
> >
> >         U kpnode_findalldevs
> >
> > So the symbols are known but seems to be undefined. How to fix this?
>
> Make sure that libpcap.a includes pcap-kpnode.o, by making sure that pcap-kpnode.c is in the list of source modules to 
> be compiled and included in libpcap.
>
> For Makefile.in, that means adding it to
>
>         MODULE_C_SRC = @MODULE_C_SRC@
>
> after @MODULE_C_SRC@ so you have
>
>         MODULE_C_SRC = @MODULE_C_SRC@ pcap-kpnode.c
>
> --- End Message ---
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