Re: build failures on Solaris

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

> --- Begin Message ---
>
>
> From: Denis Ovsienko <denis () ovsienko info>
>
> Date: Wed, 29 Sep 2021 21:21:59 +0100
>
> > For posterity, trying to CI the tcpdump-4.99 branch on illumos-amd64
> > made it apparent that the same problem used to apply to illumos:
> >
> > ld: fatal: file /usr/lib/libpcap.so: wrong ELF class: ELFCLASS32
> >
> > $ find /usr/ -name pcap-config
> > /usr/bin/pcap-config
> > /usr/bin/amd64/pcap-config
> >
> > $ /usr/bin/pcap-config --libs
> > -L/usr/lib  -lpcap
> >
> > $ /usr/bin/amd64/pcap-config --libs
> > -L/usr/lib/amd64 -Wl,-R,/usr/lib/amd64 -lpcap
>
> Hmm, something didn't look right about this explanation. Eventually I
> realized that the part above stands where and as described, but the
> result was that "tcpdump -D" didn't work because the function is
> depends upon was not detected.
>
> The part below is from netbsd-mips64, where it was a consequence of a
> GCC segfault during the function test. Which was unrelated to the 32/64
> bit problem and didn't reproduce afterwards.
>
> > This broke a number of tests, such as:
> > -- Looking for pcap_open
> > -- Looking for pcap_open - not found
> >
> > Consequently, several HAVE_xxxxx macros were erroneously unset, so
> > tcpdump compiled its own substitute pcap_xxxxx functions and
> > eventually clashed trying to link with libpcap.
>
> ld: ../libpcap/libpcap.a(pcap.o): in function
> `pcap_datalink_val_to_name':
>
> pcap.c:(.text+0x3bd8): multiple definition of
> `pcap_datalink_val_to_name';
> libnetdissect.a(dlnames.o):dlnames.c:(.text+0x100): first defined here
>
> > Cherry-picking a series of intertwined build system fixes from the
> > master branch, including commit c39d40a ("On Solaris, for 64-bit
> > builds, use the 64-bit pcap-config."), was sufficient to fix this.
>
> -- 
>     Denis Ovsienko
>
> --- End Message ---
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