Since -Wl,-fuse-ld=gold addition, this happens on IA64 arch where binutils's ld gold doesn't support --gc-sections yet:
libtool: link: ia64-unknown-linux-gnu-gcc -shared -fPIC -DPIC src/libudev/.libs/libudev_la-libudev.o src/libudev/.libs/libudev_la-libudev-list.o src/libudev/.libs/libudev_la-libu dev-util.o src/libudev/.libs/libudev_la-libudev-device.o src/libudev/.libs/libudev_la-libudev-enumerate.o src/libudev/.libs/libudev_la-libudev-monitor.o src/libudev/.libs/libudev_l a-libudev-queue.o src/libudev/.libs/libudev_la-libudev-hwdb.o -Wl,--whole-archive ./.libs/libsystemd-internal.a ./.libs/libsystemd-shared.a -Wl,--no-whole-archive -Wl,--as-needed -lrt -ldl -O2 -Wl,--no-undefined -Wl,--gc-sections -Wl,-z -Wl,relro -Wl,-z -Wl,now -Wl,-fuse-ld=gold -Wl,--version-script=/tmp/systemd-211/src/libudev/libudev.sym -Wl,-O1 -pthread -Wl,-soname -Wl,libudev.so.1 -o .libs/libudev.so.1.4.0 cc1: warning: ./src/core: No such file or directory [enabled by default] /usr/lib/gcc/ia64-unknown-linux-gnu/4.7.3/../../../../ia64-unknown-linux-gnu/bin/ld: Warning: gc-sections option ignored ./.libs/libsystemd-internal.a(libsystemd_internal_la-sd-resolve.o): In function `handle_request': /tmp/systemd-211/src/libsystemd/sd-resolve/sd-resolve.c:432: undefined reference to `__res_search' /tmp/systemd-211/src/libsystemd/sd-resolve/sd-resolve.c:430: undefined reference to `__res_query' collect2: error: ld returned 1 exit status make: *** [libudev.la] Error 1 Patch adds -lresolv to libsystemd_internal_la_LIBADD = accordingly, so building works with or without --gc-sections working properly. See also, http://bugs.gentoo.org/show_bug.cgi?id=504700
>From 2b9ae40d830596eda80cc5bc5252c6685cb75eaa Mon Sep 17 00:00:00 2001 From: Samuli Suominen <ssuomi...@gentoo.org> Date: Sat, 15 Mar 2014 20:40:24 +0200 Subject: [PATCH] Link against -lresolv to prevent linker errors like: /usr/lib/gcc/ia64-unknown-linux-gnu/4.7.3/../../../../ia64-unknown- linux-gnu/bin/ld: Warning: gc-sections option ignored ./.libs/libsystemd-internal.a(libsystemd_internal_la-sd-resolve.o): In function `handle_request': /tmp/systemd-211/src/libsystemd/sd-resolve/sd-resolve.c:432: undefined reference to '__res_search' /tmp/systemd-211/src/libsystemd/sd-resolve/sd-resolve.c:430: undefined reference to '__res_query' IA64 arch with -fuse-ld=gold doesn't support --gc-sections, which revealed the underlinking. See Gentoo bug 504700. --- Makefile.am | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/Makefile.am b/Makefile.am index 9e01cd5..4b8a081 100644 --- a/Makefile.am +++ b/Makefile.am @@ -2121,7 +2121,8 @@ libsystemd_internal_la_CFLAGS = \ -pthread libsystemd_internal_la_LIBADD = \ - $(RT_LIBS) + $(RT_LIBS) \ + -lresolv noinst_LTLIBRARIES += \ libsystemd-internal.la -- 1.9.0
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