function socket.c, line 399, `IPV6_V6ONLY' undeclared

[cfriedt]

Hi avahi people,

I'm trying to compile avahi for an embedded device and I would like to only have the avahi-core library. I've disabled everything else as far as I could tell. There doesn't seem to be a ./configure option for IPV6 so aside from altering the code, I don't think there's any way for me to prevent the compile-time error further below.

This happens both with 0.6.15 and 0.6.12, and likely the versions in between.

My ./configure line is here:

CC=arm-linux-gcc ./configure --build=i686-pc-linux-gnu --host=arm-9tdmi-linux-gnu --prefix=$PWD/../avahi-0.6.12-arm  --disable-glib  --disable-qt3 --disable-qt4 --disable-gtk  --disable-dbus  --disable-expat  --disable-gdbm --disable-libdaemon  --disable-python  --disable-pygtk --disable-python-dbus --disable-mono --disable-monodoc  --disable-doxygen-doc  --disable-manpages --with-distro=debian

I just grepped for IPV6_V6ONLY recursively through /usr/include, and i found it in:

/usr/include/linux/in6.h

/usr/include/linux/in6.h:172:#define IPV6_V6ONLY

Is this a known bug? Would it fix the problem by simply adding

#ifdef ... ipv6 code #endif

code to the function / header files (socket.c/h i guess) ? Is there some reason why IPv6 is always built?

Many thanks. I'm going to patch this myself for now, should I send you the diff?

~/Chris

arm-linux-gcc -DHAVE_CONFIG_H -I. -I. -I.. -I.. "-DDEBUG_TRAP=__asm__(\"int \$3\")" -g -O2 -Wall -W -Wextra -pedantic -pipe -Wformat -Wold-style-definition -Wdeclaration-after-statement -Wfloat-equal -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wredundant-decls -Wmissing-noreturn -Wshadow -Wendif-labels -Wpointer-arith -Wbad-function-cast -Wcast-qual -Wcast-align -Wwrite-strings -Winline -MT libavahi_core_la-socket.lo -MD -MP -MF .deps/libavahi_core_la-socket.Tpo -c socket.c  -fPIC -DPIC -o .libs/libavahi_core_la-socket.o
socket.c: In function `avahi_open_socket_ipv6':
socket.c:399: error: `IPV6_V6ONLY' undeclared (first use in this function)
socket.c:399: error: (Each undeclared identifier is reported only once
socket.c:399: error: for each function it appears in.)
socket.c: In function `avahi_send_dns_packet_ipv4':
socket.c:520: warning: cast increases required alignment of target type
socket.c: In function `avahi_send_dns_packet_ipv6':
socket.c:603: warning: cast increases required alignment of target type
socket.c: In function `avahi_recv_dns_packet_ipv4':
socket.c:692: warning: cast increases required alignment of target type
socket.c:698: warning: cast increases required alignment of target type
socket.c: In function `avahi_recv_dns_packet_ipv6':
socket.c:815: warning: cast increases required alignment of target type
socket.c:822: warning: cast increases required alignment of target type
make[2]: *** [libavahi_core_la-socket.lo] Error 1
make[2]: Leaving directory `/home/cfriedt/Desktop/avahi-0.6.12/avahi-core'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/cfriedt/Desktop/avahi-0.6.12'
make: *** [all] Error 2

[lathiat]

I guess IPv6 is always built because generally it doesn't hurt... I'd be interested to know why IPV6_V6ONLY isn't defined on your system

What kind of embedded system is this? What kernel version?

[lennart]

on glibc IPV6_ONLY is also defined in ./bits/in.h. What kind of libc are you using?

You're welcome to send in a patch that disables IPv6 support with a configure option. We will certainly merge it if it is clean enough.

[lennart]

Closing due to lack of response.