build failures on Solaris

[Denis Ovsienko via tcpdump-workers <tcpdump-workers () lists tcpdump org>]

> --- Begin Message ---
>
>
> From: Denis Ovsienko <denis () ovsienko info>
>
> Date: Sat, 31 Jul 2021 11:37:52 +0100
>
> On Sat, 24 Jul 2021 00:11:27 +0100
> Denis Ovsienko via tcpdump-workers <tcpdump-workers () lists tcpdump org>
> wrote:
>
> > There are more related corner cases of varying severity,
> > some of which I might have time to describe later.
>
> So, as promised... Several warnings are now documented in the build
> scripts (look for TCPSLICE_TAINTED=yes and TCPDUMP_TAINTED=yes).
> Another problem that is briefly mentioned in a comment is tcpdump build
> issues on Solaris specific to CMake and system libpcap. Hopefully my
> notes have captured the details right.
>
> ##### Solaris 10 with Sun C #####
> The pre-compile libpcap feature test programs link with the system
> libpcap.so fine and run fine. The tcpdump binary links fine, but fails
> to run:
>
> $ /tmp/tcpdump_build_matrix.XXtwaqbh/bin/tcpdump --version
> ld.so.1: tcpdump: fatal: libpcap.so.1: open failed: No such file or
> directory
>
> $ ldd /tmp/tcpdump_build_matrix.XXyKaiEo/bin/tcpdump
>
>         libpcap.so.1 =>  (file not found)
>         libsocket.so.1 =>        /lib/libsocket.so.1
>         libnsl.so.1 =>   /lib/libnsl.so.1
>         libsmi.so.2 =>   (file not found)
>         libc.so.1 =>     /lib/libc.so.1
>         libmp.so.2 =>    /lib/libmp.so.2
>         libmd.so.1 =>    /lib/libmd.so.1
>         libscf.so.1 =>   /lib/libscf.so.1
>         libdoor.so.1 =>  /lib/libdoor.so.1
>         libuutil.so.1 =>         /lib/libuutil.so.1
>         libgen.so.1 =>   /lib/libgen.so.1
>         libm.so.2 =>     /lib/libm.so.2
>         /platform/SUNW,SPARC-Enterprise-T5220/lib/libc_psr.so.1
>         /platform/SUNW,SPARC-Enterprise-T5220/lib/libmd_psr.so.1
>
> $ pcap-config --libs                                          
> -L/opt/csw/lib -R/opt/csw/lib -lpcap
>
> It looks like the test programs use the runpath, but tcpdump does not.
>
> ##### Solaris 11 with GCC #####
> This is the opposite: the pre-compile libpcap feature test programs
> fail to link so all libpcap feature tests fail. However, libpcap is
> detected as available and the build process resorts to missing/ and
> produces a binary of tcpdump that is mostly functional:
>
> $ /tmp/tcpdump_build_matrix.XX06MD.a/bin/tcpdump -D
> /tmp/tcpdump_build_matrix.XX06MD.a/bin/tcpdump: illegal option -- D
>
> The problem seems to be that the feature test linking instead of using
> the flags returned by pcap-config points exactly to the 32-bit version
> of libpcap and fails:
>
> $ pcap-config --libs
> -L/usr/lib  -lpcap
>
> /usr/bin/gcc
> -DCHECK_FUNCTION_EXISTS=pcap_list_datalinks
> CMakeFiles/cmTC_d38b1.dir/CheckFunctionExists.c.o  -o cmTC_d38b1
> /usr/lib/libpcap.so
>
> ld: fatal: file /usr/lib/libpcap.so: wrong ELF class: ELFCLASS32
> collect2: error: ld returned 1 exit status
>
> It likely has to do with these CMake variables:
>
> TCPDUMP_LINK_LIBRARIES=/usr/lib/libpcap.so;socket;nsl
> PCAP_LIBRARIES=/usr/lib/libpcap.so
>
> Soon after that tcpdump linking does not force the 32-bit library and
> works:
>
> /usr/bin/gcc    CMakeFiles/tcpdump.dir/fptype.c.o
> CMakeFiles/tcpdump.dir/tcpdump.c.o CMakeFiles/tcpdump.dir/bpf_dump.c.o
> CMakeFiles/tcpdump.dir/missing/pcap_dump_ftell.c.o
> CMakeFiles/tcpdump.dir/missing/datalinks.c.o
> CMakeFiles/tcpdump.dir/missing/dlnames.c.o  -o tcpdump libnetdissect.a
> -lpcap -lsocket -lnsl 
>
> This automatically uses the 64-bit library (not in /usr/lib).
>
> Autoconf build does not have the problem with feature tests because it
> uses exactly what pcap-config has returned and lets the linker figure
> the details out:
>
> configure:6157: checking for pcap_findalldevs
> configure:6157: gcc -o conftest -I/usr/inet6/include -g -O2
> conftest.c -L/usr/lib  -lpcap -lsocket -lnsl  >&5
> configure:6157: $? = 0
>
> Sun C does not have the problem with feature tests: CMake invokes it
> same way as GCC, but Sun C manages to produce feature test programs
> that work as expected:
>
> /opt/solarisstudio12.4/bin/suncc
> -DCHECK_FUNCTION_EXISTS=pcap_list_datalinks
> CMakeFiles/cmTC_97fb2.dir/CheckFunctionExists.c.o  -o cmTC_97fb2
> /usr/lib/libpcap.so
>
> This looks like some heuristics or a short-cut built into Sun C, but it
> seems wrong to depend on it. Moreover, Sun C does not have to guess hard
> for tcpdump linking because the flags are just correct:
>
> /opt/solarisstudio12.4/bin/suncc    CMakeFiles/tcpdump.dir/fptype.c.o
> CMakeFiles/tcpdump.dir/tcpdump.c.o  -o tcpdump libnetdissect.a -lpcap
> -lsocket -lnsl 
>
> -- 
>     Denis Ovsienko
>
> --- End Message ---
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