[Freeciv-Dev] [bug #20476] netdb.h conflict
URL:
http://gna.org/bugs/?20476
Summary: netdb.h conflict
Project: Freeciv
Submitted by: hugo
Submitted on: Sun 03 Feb 2013 01:04:36 PM GMT
Category: general
Severity: 2 - Minor
Priority: 5 - Normal
Status: None
Assigned to: None
Originator Email:
Open/Closed: Open
Release:
Discussion Lock: Any
Operating System: GNU/Linux
Planned Release:
___
Details:
After building against SVN @22265 on Ubuntu Ubuntu 10.04.4 LTS (Lucid),
attempting to start the server immediately bailed out with the error Server:
bad address: (none):5556.
After some digging, this turned out to be a conflict between two different
netdb.h files - /usr/include/netdb.h comes from libc6 (Ubuntu package libc-dev
version 2.11.1-0ubuntu7.11 from the eglibc project), and includes a
definition:
# define AI_NUMERICSERV 0x0400 /* Don't use name resolution. */
I also have /usr/include/bind/netdb.h, which comes from libbind (Ubuntu
package libbind4, version 6.0-1, from the libbind project). This is the
library that actually provides getaddrinfo(3), and does *not* define or
support NUMERICSERV; attempting to pass ai_flags with 0x400 set always returns
EAI_BADFLAGS.
I don't know whether the error here is mine, Ubuntu's, Freeciv's, or that of
one of the two source projects.
1) It was made harder to track down the problem because net_lookup_getaddrinfo
in utility/netintf.c does not report or return the actual error. It would be
useful if it could be modified to log the error, eg with:
... else {
printf(getaddrinfo: error '%s' (%d)\n, gai_strerror(err), err);
}
2) I do not know if the configure probes could be enhanced to check for both
netdb.h and bind/netdb.h and make an intelligent choice between them. For
now I've just hacked my netintf.c, which has got me a little further; I've not
yet checked if I also need to change the other uses of netdb.h.
3) An alternative would be to support a build hint HAVE_AI_NUMERICSERV, but I
suspect it will generally be hard for someone building freeciv to discover
they should override this to false.
Hope this helps,
Hugo
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[Freeciv-Dev] [bug #20476] netdb.h conflict
Follow-up Comment #3, bug #20476 (project freeciv):
Can you confirm if I got this right.
Yes, header that is included is /usr/include/netdb.h which does define
AI_NUMERICSERV.
Meanwhile you can test if manually setting
CPPFLAGS=-I/usr/include/bind for configure produces working
build.
It failed, this time on functions such as inet_ntoa, I think due to conflicts
between arpa/inet.h and bind/arpa/inet.h - the latter redefines inet_ntoa to
__inet_ntoa, but then __inet_ntoa can't be found at link time.
I tried instead going the other way, to try to convince configure that I
didn't need libbind at all:
% svn diff configure.ac
Index: configure.ac
===
--- configure.ac(revision 22316)
+++ configure.ac(working copy)
@@ -1012,8 +1012,11 @@
if test x$server = xyes; then
SERVER_LIBS=-lm ${SERVER_LIBS}
-dnl Some systems (e.g., BeOS) need this lib
-AC_CHECK_LIB(bind, gethostbyaddr, SERVER_LIBS=-lbind $SERVER_LIBS)
+dnl Some systems (e.g., BeOS) need -lbind, while others can better avoid
it
+AC_CHECK_FUNCS([gethostbyaddr])
+if test $ac_cv_func_gethostbyaddr = no; then
+ AC_CHECK_LIB(bind, gethostbyaddr, SERVER_LIBS=-lbind $SERVER_LIBS)
+fi
dnl Readline library and header files.
FC_HAS_READLINE()
With that change, -lbind is no longer included in LIBS or SERVER_LIBS; for
some reason it is still included in GUI_sdl_LIBS, and I wasn't able to find
what introduces it there. But I can build successfully with
--enable-client=gtk2 (previously gtk2,sdl), start a server and a client and
have them talk to each other.
I suspect that the libbind4 package is my main problem, and I plan to remove
it (but I'll wait in case there's more you'd like me to test); I believe that
on this OS libc contains everything I'm likely to need from libbind, and quite
likely in more modern and featureful fashion.
Here's my full configure invocation now:
./configure --prefix=/opt/freeciv --enable-fcdb=mysql --enable-client=gtk2
--enable-svnrev --enable-aimodules=yes --disable-nls --enable-debug=some
--with-readline --with-x --enable-shared --disable-ipv6
Hugo
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