It was <2014-02-21 pią 16:22>, when Lennart Poettering wrote: > On Fri, 21.02.14 15:54, Łukasz Stelmach (l.stelm...@samsung.com) wrote: > >> Fix problems with unresolved symbols when building on Ubuntu 12.04 x86_64. >> >> --8<---------------cut here---------------start------------->8--- >> ./.libs/libudev.so: undefined reference to `__res_search' >> ./.libs/libudev.so: undefined reference to `__res_query' >> collect2: ld returned 1 exit status >> --8<---------------cut here---------------end--------------->8--- > > This doesn't look right. libudev really shouldn't need libresolv. We > should figure out how these calls got pulled in...
Let me go step-by-step:
--8<---------------cut here---------------start------------->8---
$ strings ./.libs/libudev.so | grep __res_'\(query\|search\)'
__res_query
__res_search
# libudev needs libsystemd-internal
$ strings ./.libs/libsystemd-internal.a | grep __res_'\(query\|search\)'
__res_query
__res_search
$ grep __res_query [list of objects used to build l-i.a]
Binary file src/libsystemd/sd-resolve/.libs/libsystemd_internal_la-sd-resolve.o
matches
$ rm -f src/libsystemd/sd-resolve/libsystemd_internal_la-sd-resolve.lo \
&& strace make src/libsystemd/sd-resolve/libsystemd_internal_la-sd-resolve.lo
$ grep __res_'\(query\|search\)' /usr/include/resolv.h
#define res_query __res_query
#define res_querydomain __res_querydomain
#define res_search __res_search
$ gcc -std=gnu99 [...]-E src/libsystemd/sd-resolve/sd-resolve.c -fPIC \
-DPIC | grep __res_'\(query\|search\)'
void __res_close (void) __attribute__ ((__nothrow__ , __leaf__));
int __res_init (void) __attribute__ ((__nothrow__ , __leaf__));
int __res_isourserver (const struct sockaddr_in *) __attribute__ ((__nothrow__
, __leaf__));
int __res_mkquery (int, const char *, int, int, const u_char *,
int, const u_char *, u_char *, int) __attribute__ ((__nothrow__ ,
__leaf__));
int __res_query (const char *, int, int, u_char *, int) __attribute__
((__nothrow__ , __leaf__));
int __res_querydomain (const char *, const char *, int, int,
u_char *, int) __attribute__ ((__nothrow__ , __leaf__));
int __res_search (const char *, int, int, u_char *, int) __attribute__
((__nothrow__ , __leaf__));
int __res_send (const u_char *, int, u_char *, int) __attribute__ ((__nothrow__
, __leaf__));
# 327 "/usr/include/resolv.h" 3 4
int __res_hnok (const char *) __attribute__ ((__nothrow__ , __leaf__));
--
do { if ((__builtin_expect(!!(!(length == sizeof(ResRequest) +
res_req->dname_len)),0))) log_assert_failed("length == sizeof(ResRequest) +
res_req->dname_len", "src/libsystemd/sd-resolve/sd-resolve.c", 425,
__PRETTY_FUNCTION__); } while (0);
dname = (const char *) req + sizeof(ResRequest);
if (req->type == REQUEST_RES_QUERY)
ret = __res_query(dname, res_req->class,
res_req->type, (unsigned char *) &answer, 10240);
else
ret = __res_search(dname, res_req->class,
res_req->type, (unsigned char *) &answer, 10240);
return send_res_reply(out_fd, req->id, (unsigned char *)
&answer, ret, (*__errno_location ()), (*__h_errno_location ()));
}
case REQUEST_TERMINATE:
--8<---------------cut here---------------end--------------->8---
There are defines in resolv.h which make res_query() and res_search() be
substituted with __res_.* versions. These does not look like Ubuntu
specific stuff[1].
[1]
https://sourceware.org/git/?p=glibc.git;a=blob;f=resolv/resolv.h;h=53c3bba182be49ba0a2372ffba7920c016029ecd;hb=HEAD#l262
--
Łukasz Stelmach
Samsung R&D Institute Poland
Samsung Electronics
pgp3lwnDs_tBP.pgp
Description: PGP signature
_______________________________________________ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
