From: Evangelos Foutras <evangelos@foutrelis.com>
Date: Fri, 19 Apr 2013 21:17:08 +0000 (+0300)
Subject: build-sys: prevent library underlinking
X-Git-Tag: v203~126
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=commitdiff_plain;h=9d2d0fe1e3f28a639c26b62391f79cfd1450d91b

build-sys: prevent library underlinking

Underlinking can cause subtle bugs like the recent issue with
libnss_myhostname (which was fixed in commit 1e335af7).
---

diff --git a/configure.ac b/configure.ac
index 517378394..ce02ff6f8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -144,6 +144,7 @@ AC_SUBST([OUR_CPPFLAGS], $with_cppflags)
 
 CC_CHECK_FLAGS_APPEND([with_ldflags], [LDFLAGS], [\
         -Wl,--as-needed \
+        -Wl,--no-undefined \
         -Wl,--gc-sections \
         -Wl,-z,relro \
         -Wl,-z,now])