Unix Programming - autoconf automake

Author

autoconf automake

Damien MATTEI

2004-09-18, 8:56 am

hi,

i had a few question about porting a project to GNU standarts:

my program use libpcap and compile on latest linux with:

gcc -D_GNU_SOURCE -DPACKETS_TIME=-1 snif.c -o snif -lpcap

first question is simpliest :

how can i tell autotools to add -lpcap to use lipcap at linking, i
finally add this in Makefile.am:

LIBS = -lpcap

so my Makefile.am looks like that:

bin_PROGRAMS = snif
snif_SOURCES = snif.c snif.h ethernet.h tokenring.h ppp.h loopback.h
ip.h icmp.h tcp.h udp.h terminal.h color.h
LIBS = -lpcap

but isn't it an other solution?

second question is:

i have to change the value of PACKETS_TIME according to the
architecture, example : set it to -1 on linux and to 255 on Mac os X,
how can i do that with autotools again??

more :

on older linux system my program compile with this:

gcc -DNO_MULTI_HASH_TABLE -DPACKETS_TIME=-1 snif.c -o snif -lpcap
-I/usr/include/pcap/

how can i use autotools to add the include -I/usr/include/pcap/ if it
exist a directory /usr/include/pcap/ ?

and how can i add the definition of the macro NO_MULTI_HASH_TABLE if
it exist a function hcreate_r in the libc which is not on older linux
where only exist hcreate, i think i can test it whith autoconf with
running then C preprocessor but don't know exactly how.

i must add a file dnscache.h if the macro NO_MULTI_HASH_TABLE is
defined and my Makefile.am looks like that:

bin_PROGRAMS = snif
snif_SOURCES = snif.c snif.h ethernet.h tokenring.h ppp.h loopback.h
ip.h icmp.h tcp.h udp.h dnscache.h terminal.h color.h
LIBS = -lpcap

i read lots of howto and doc on autoconf and automake but it doesn't
bring light to my questions...

any helps greatly appreciate!

Damien

email: mattei@unice.fr , damien_mattei@yahoo.com

Roger Leigh

2004-09-18, 8:56 am

damien_mattei@yahoo.com (Damien MATTEI) writes:

> how can i tell autotools to add -lpcap to use lipcap at linking, i
> finally add this in Makefile.am:
>
> LIBS = -lpcap
>
> so my Makefile.am looks like that:
>
> bin_PROGRAMS = snif
> snif_SOURCES = snif.c snif.h ethernet.h tokenring.h ppp.h loopback.h
> ip.h icmp.h tcp.h udp.h terminal.h color.h
> LIBS = -lpcap
>
> but isn't it an other solution?

snif_LDADD = -lpcap

> second question is:
>
> i have to change the value of PACKETS_TIME according to the
> architecture, example : set it to -1 on linux and to 255 on Mac os X,
> how can i do that with autotools again??

AC_CONFIG_HEADER
AC_DEFINE_UNQUOTED

then run autoheader and #include <config.h>. You set the value in
configure.ac.

> on older linux system my program compile with this:
>
> gcc -DNO_MULTI_HASH_TABLE -DPACKETS_TIME=-1 snif.c -o snif -lpcap
> -I/usr/include/pcap/
>
> how can i use autotools to add the include -I/usr/include/pcap/ if it
> exist a directory /usr/include/pcap/ ?

Add it to AM_CPPFLAGS. You can AC_SUBST it from configure.ac if you
like.

> and how can i add the definition of the macro NO_MULTI_HASH_TABLE if
> it exist a function hcreate_r in the libc which is not on older linux
> where only exist hcreate, i think i can test it whith autoconf with
> running then C preprocessor but don't know exactly how.

AC_CHECK_FUNC

> i must add a file dnscache.h if the macro NO_MULTI_HASH_TABLE is
> defined and my Makefile.am looks like that:
>
> bin_PROGRAMS = snif
> snif_SOURCES = snif.c snif.h ethernet.h tokenring.h ppp.h loopback.h
> ip.h icmp.h tcp.h udp.h dnscache.h terminal.h color.h
> LIBS = -lpcap

What do you mean by "add"? To install on the system? To include
during compliation?

#ifndef NO_MULTI_HASH_TABLE
# include "dnscache.h"
#endif

HTH,
Roger

--
Roger Leigh

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