Re: Update configure for libpcap

[Ali Abdulkadir <autostart.ini () gmail com>]

I was on my phone. I should have been more specific. With ‘ANSI compiler check’ I meant the AC_LBL_FIXINCLUDES m4 macro.
I can’t succeed because there isn’t a sys/ioctl.h on win32.
AC_PROG_CC_C99, however, works fine with MInGW.

> Can automake be used with non-GPLed software?

To quote from the docs:
“Automake places no restrictions on the distribution of the resulting Makefile.ins. We still encourage software authors 
to distribute their work under terms like those of the GPL, but doing so is not required to use Automake.
Some of the files that can be automatically installed via the --add-missing switch do fall under the GPL. However, 
these also have a special exception allowing you to distribute them with your package, regardless of the licensing you 
choose.”
https://www.gnu.org/software/automake/manual/automake.html#Distributing

> libtool has its own idea of how to name shared library files, so we'd have to work around that

That shouldn’t be a problem. You could link with “-version-info YOUR_OWN_VERSION_STRING_HERE” to hand libtool your 
preferred version string. You would add that to pcap_la_LDFLAGS in your Makefile.am.


From: Guy Harris
Sent: Thursday, July 12, 2018 12:23 AM
To: Ali Abdulkadir
Cc: Petr Vorel; tcpdump-workers () lists tcpdump org
Subject: Re: [tcpdump-workers] Update configure for libpcap

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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