Re: Update configure for libpcap

[Guy Harris <gharris () sonic net>]

On Jul 11, 2018, at 1:32 PM, Ali Abdulkadir <autostart.ini () gmail com> wrote:

> Nope. Although it wouldn't be super helpful if they were to remove/update the ANSI compiler test. That would make 
> libpcap at least *compile* on windows with the autotools. I think tcpdump's configure script removed that test at 
> some point.

There isn't an "ANSI compiler test".

Currently, libpcap *and* tcpdump use the standard autoconf macro AC_PROG_CC_C99, which checks for flags necessary to 
implement C99 features.  We require a subset of C99 features to be available in the compiler, so we *can't* remove 
that.  (Yes, that means older versions of MSVC aren't guaranteed to be able to compile libpcap and can't compile 
tcpdump. We're not going to change that.)

> Linking (shared) is currently not possible though. Fixing that is more complicated as libpcap's Makefiles are mostly 
> handcrafted (don't use e.g. automake which would handle OS specific things such as the setting proper file 
> extensions).

Can automake be used with non-GPLed software?

(libtool has its own idea of how to name shared library files, so we'd have to work around that "feature" in a 
platform-dependent fashion, were we to use it.)
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