build-system: make it compatible with ASan/UBsan/MSan

configure.ac

@@ -200,6 +200,11 @@ AC_ARG_ENABLE([werror],
 	[AS_HELP_STRING([--disable-werror], [do not treat warnings as errors])],
 	[enable_werror=$enableval], [enable_werror=yes])
 
+AC_ARG_ENABLE([no_undefined],
+	[AS_HELP_STRING([--disable-no-undefined], [do not pass -Wl,--no-undefined])],
+	[enable_no_undefined=$enableval], [enable_no_undefined=yes])
+AM_CONDITIONAL([ENABLE_NO_UNDEFINED], [test "x$enable_no_undefined" = "xyes"])
+
 # Allow disabling rpath
 AC_ARG_ENABLE([rpath],
 	[AS_HELP_STRING([--enable-rpath], [set rpath in executables [default=no]])],
@@ -801,12 +806,15 @@ AC_SUBST(AM_CFLAGS)
 
 CC_CHECK_FLAGS_APPEND([AM_LDFLAGS],[LDFLAGS],[ \
 	-Wl,--as-needed \
-        -Wl,--no-undefined \
         -Wl,--gc-sections \
         -Wl,-z,relro \
         -Wl,-z,now \
         -pie \
         -Wl,-fuse-ld=gold])
+
+AM_COND_IF([ENABLE_NO_UNDEFINED],
+	[CC_CHECK_FLAGS_APPEND([AM_LDFLAGS],[LDFLAGS],[-Wl,--no-undefined])])
+
 AC_SUBST(AM_LDFLAGS)
 
 CFLAGS="$CFLAGS -Wvla -std=gnu11 -fms-extensions"

src/lxc/Makefile.am

@@ -262,10 +262,13 @@ liblxc_la_CFLAGS = -fPIC \
 		   -pthread
 
 liblxc_la_LDFLAGS = -pthread \
-		    -Wl,-no-undefined \
 		    -Wl,-soname,liblxc.so.$(firstword $(subst ., ,@LXC_ABI@)) \
 		    -version-info @LXC_ABI_MAJOR@
 
+if ENABLE_NO_UNDEFINED
+liblxc_la_LDFLAGS += -Wl,-no-undefined
+endif
+
 liblxc_la_LIBADD = $(CAP_LIBS) \
 		   $(OPENSSL_LIBS) \
 		   $(SELINUX_LIBS) \
@@ -1855,8 +1858,7 @@ pam_cgfs_la_LIBADD = $(AM_LIBS) \
 pam_cgfs_la_LDFLAGS = $(AM_LDFLAGS) \
 		      -avoid-version \
 		      -module \
-		      -shared \
-		      -Wl,-no-undefined
+		      -shared
 endif
 endif