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 18:05:09 +0100
>
> On Sun, 1 Aug 2021 19:19:14 -0700
> Guy Harris <gharris () sonic net> wrote:
>
> > At this point, I'm seeing two problems:
> >
> > 1) The pcap-config and libpcap.pc that we generate always include a
> > -L flag, even if the directory is a system include directory, which
> > means that it could be wrong in a system with 32-bit and 64-bit
> > libraries in separate directories.  Debian removes that from
> > pcap-config to avoid that problem.  We shouldn't add -L in that case.
> >
> > 2) Tcpdump needs to work around that when configuring.
> >
> > The first is definitely our bug, given that Debian is working around
> > it.
> >
> > The second would be helpful; we already work around Apple screwing up
> > pcap-config by having the one they ship with macOS include
> > -L/usr/local/lib for no good reason.
>
> 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
>
> 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.
>
> 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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