[Anders Broman <anders.broman@xxxxxxxxxxxx>]

-----Original Message-----
From: Wireshark-dev [mailto:wireshark-dev-bounces@xxxxxxxxxxxxx] On Behalf Of Anders Broman
Sent: den 12 oktober 2017 12:26
To: Developer support list for Wireshark <wireshark-dev@xxxxxxxxxxxxx>
Subject: Re: [Wireshark-dev] Building Wireshark on SuSE 11.4 fails, configure does not find pcap functions.



-----Original Message-----
From: Wireshark-dev [mailto:wireshark-dev-bounces@xxxxxxxxxxxxx] On Behalf Of Guy Harris
Sent: den 12 oktober 2017 10:39
To: Developer support list for Wireshark <wireshark-dev@xxxxxxxxxxxxx>
Subject: Re: [Wireshark-dev] Building Wireshark on SuSE 11.4 fails, configure does not find pcap functions.

On Oct 12, 2017, at 12:09 AM, Anders Broman <anders.broman@xxxxxxxxxxxx> wrote:

> -----Original Message-----
> From: Wireshark-dev [mailto:wireshark-dev-bounces@xxxxxxxxxxxxx] On 
> Behalf Of Guy Harris
> Sent: den 11 oktober 2017 22:00
> To: Developer support list for Wireshark <wireshark-dev@xxxxxxxxxxxxx>
> Subject: Re: [Wireshark-dev] Building Wireshark on SuSE 11.4 fails, configure does not find pcap functions.
> 
> On Oct 11, 2017, at 4:24 AM, Anders Broman <anders.broman@xxxxxxxxxxxx> wrote:
> 
>> Looking in configure.log
> 
>> What's the full config.log file?
> 
> Included the log file.
>
>OK, so the configure script is not finding pcap_findalldevs(), and, as a result, isn't bothering to look for pcap_datalink_name_to_val() and is just assuming it's not present.
>
>From looking at my collection of CVS/git trees for various libpcap release branches, pcap_datalink_name_to_val() first appeared in libpcap 0.8, and pcap_findalldevs() first >appeared in libpcap 0.7, so, assuming a normal libpcap (rather than a libpcap that somebody upstream decided to tweak), the configure script is making a reasonable >assumption.
>
>The build log seems to suggest that pcap_datalink_name_to_val() is declared in pcap.h - and the version of the libpcap-devel package is "0.9.8-50.10.1", so *perhaps* it's >based on libpcap 0.9.8 - or perhaps something newer (Debian tends, or at least has tended, to call their libpcap "0.8", although it's currently based on a much more recent >libpcap; I guess that's just the shared library version number, for binary compatibility).  If it's based on 0.9.8, or a later release, it *should* have pcap_findalldevs() *and* >pcap_datalink_name_to_val().
>
>The command used by the configure script to compile the 
>test-for-pcap_findalldevs() program is
>
>	gcc -std=gnu99 -o conftest -I/usr/include/pcap -Wall 
>	  -Wextra -Wendif-labels -Wpointer-arith -Wformat-security -fwrapv
>	  -fno-strict-overflow -fno-delete-null-pointer-checks -Wvla -Waddress
>	  -Wattributes -Wdiv-by-zero -Wignored-qualifiers -Wpragmas
>	  -Wno-overlength-strings -Wno-long-long -Wc++-compat -Wshadow
>	  -Wno-pointer-sign -Wold-style-definition -Wstrict-prototypes
>	  -Werror=implicit -fvisibility=hidden -g -O2 -D_FORTIFY_SOURCE=2
>	  -Wl,--as-needed conftest.c -lm
>
>Notably absent from that command is the flag "-lpcap"; the absence of 
>that flag might explain why it got the error
>
Comparing with configure.log  of Ubuntu 14.04 building the same version -lpcap is set.

configure:50315: checking whether pcap_findalldevs is present and usable
configure:50336: gcc -std=gnu99 -o conftest  -Wall -Wextra -Wendif-labels -Wpointer-arith -Wformat-security -fwrapv -fno-strict-overflow -fno-delete-null-pointer-checks -Wvla -Waddress -Wattributes -Wdiv-by-zero -Wignored-qualifiers -Wpragmas -Wno-overlength-strings -Wno-long-long -Wc++-compat -Wshadow -Wno-pointer-sign -Wold-style-definition -Wstrict-prototypes -Wlogical-op -Wjump-misses-init -Werror=implicit -fexcess-precision=fast -fvisibility=hidden -g -O2 -D_FORTIFY_SOURCE=2  -Wl,--as-needed  conftest.c -L/usr/lib/x86_64-linux-gnu  -lpcap -lm  >&5
conftest.c:52:11: warning: function declaration isn't a prototype [-Wstrict-prototypes]
       int main()
	undefined reference to `pcap_findalldevs'

I'm not sure why.  On the failing system there is an old version of autoconf and friends:
ericsson@BuildWireShark3:~/ewireshark/trunk> autoconf --version autoconf (GNU Autoconf) 2.64 Copyright (C) 2009 Free Software Foundation, Inc.


>If something's stored in the garage, you won't find it if you don't look in the garage....
>
>In fact, the only place where it *does* appear to link with libpcap is the test for pcap_open_live().
>
>A quick test of the configure script from a reasonably recent pull of the master branch shows it linking with -lpcap in all the tests for various pcap functions, so I'm not sure >why it wouldn't be doing so with your configure script.
>
>Is this a built from a git checkout or from a release tarball?  If it's from a git checkout, what happens if you do a "make maintainer-clean", a "./autogen.sh", and then a >"./configure"?

It's from an svn clone of the old svn repo kept up to date with the latest git version. I did check a fresh svn checkout. I could try to build the standard Wireshark From trunk.

Building from a fresh git checkout gives the same error ☹

configure:49066: checking for pcap_open_live in -lpcap
configure:49091: gcc -std=gnu99 -o conftest -I/usr/include/pcap -Wall -Wextra -Wendif-labels -Wpointer-arith -Wformat-security -fwrapv -fno-strict-overflow -fno-delete-null-pointer-checks -Wvla -Waddress -Wattributes -Wdiv-by-zero -Wignored-qualifiers -Wpragmas -Wno-overlength-strings -Wno-long-long -Wc++-compat -Wshadow -Wno-pointer-sign -Wold-style-definition -Wstrict-prototypes -Werror=implicit -fvisibility=hidden -g -O2 -D_FORTIFY_SOURCE=2  -Wl,--as-needed  conftest.c -lpcap   -lm  >&5
conftest.c:47: warning: function declaration isn't a prototype
conftest.c:50: warning: function declaration isn't a prototype
conftest.c: In function 'main':
conftest.c:50: warning: old-style function definition
configure:49091: $? = 0
configure:49100: result: yes
configure:49170: checking for pcap_open_dead
configure:49170: gcc -std=gnu99 -o conftest -I/usr/include/pcap -Wall -Wextra -Wendif-labels -Wpointer-arith -Wformat-security -fwrapv -fno-strict-overflow -fno-delete-null-pointer-checks -Wvla -Waddress -Wattributes -Wdiv-by-zero -Wignored-qualifiers -Wpragmas -Wno-overlength-strings -Wno-long-long -Wc++-compat -Wshadow -Wno-pointer-sign -Wold-style-definition -Wstrict-prototypes -Werror=implicit -fvisibility=hidden -g -O2 -D_FORTIFY_SOURCE=2  -Wl,--as-needed  conftest.c  -lm  >&5
conftest.c:63: warning: function declaration isn't a prototype
conftest.c:73: warning: function declaration isn't a prototype
conftest.c: In function 'main':
conftest.c:73: warning: old-style function definition
/tmp/ccqmF4PP.o: In function `main':
/home/ericsson/wireshark/conftest.c:74: undefined reference to `pcap_open_dead'
collect2: ld returned 1 exit status

Regards
Anders
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