Disable -Wl,-z,defs for ASAN builds

Commit af65916 added -Wl,-z,defs for the shared libraries. This
apparently does not work in some cases with --enable-asan, so only add
it for non-ASAN builds.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: João Carlos Mendes Luis <jonny@jonny.eng.br>
Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Closes #10557
Closes #10560

lib/libnvpair/Makefile.am

@@ -31,7 +31,11 @@ libnvpair_la_LIBADD = \
 
 libnvpair_la_LIBADD += $(LIBTIRPC_LIBS) $(LTLIBINTL)
 
-libnvpair_la_LDFLAGS = -Wl,-z,defs
+libnvpair_la_LDFLAGS =
+
+if !ASAN_ENABLED
+libnvpair_la_LDFLAGS += -Wl,-z,defs
+endif
 
 if BUILD_FREEBSD
 libnvpair_la_LDFLAGS += -version-info 3:0:0

lib/libuutil/Makefile.am

@@ -21,7 +21,11 @@ libuutil_la_LIBADD = \
 
 libuutil_la_LIBADD += $(LTLIBINTL)
 
-libuutil_la_LDFLAGS = -pthread -Wl,-z,defs
+libuutil_la_LDFLAGS = -pthread
+
+if !ASAN_ENABLED
+libuutil_la_LDFLAGS += -Wl,-z,defs
+endif
 
 if BUILD_FREEBSD
 libuutil_la_LDFLAGS += -version-info 3:0:0

lib/libzfs/Makefile.am

@@ -76,7 +76,11 @@ libzfs_la_LIBADD = \
 
 libzfs_la_LIBADD += -lm $(LIBCRYPTO_LIBS) $(ZLIB_LIBS) $(LTLIBINTL)
 
-libzfs_la_LDFLAGS = -pthread -Wl,-z,defs
+libzfs_la_LDFLAGS = -pthread
+
+if !ASAN_ENABLED
+libzfs_la_LDFLAGS += -Wl,-z,defs
+endif
 
 if BUILD_FREEBSD
 libzfs_la_LIBADD += -lutil -lgeom

lib/libzfs_core/Makefile.am

@@ -15,7 +15,11 @@ libzfs_core_la_LIBADD = \
 
 libzfs_core_la_LIBADD += $(LTLIBINTL)
 
-libzfs_core_la_LDFLAGS = -pthread -Wl,-z,defs
+libzfs_core_la_LDFLAGS = -pthread
+
+if !ASAN_ENABLED
+libzfs_core_la_LDFLAGS += -Wl,-z,defs
+endif
 
 if BUILD_FREEBSD
 libzfs_core_la_LIBADD += -lutil -lgeom

lib/libzpool/Makefile.am

@@ -210,7 +210,11 @@ libzpool_la_LIBADD = \
 
 libzpool_la_LIBADD += $(LIBCLOCK_GETTIME) $(ZLIB_LIBS) -ldl
 
-libzpool_la_LDFLAGS = -pthread -Wl,-z,defs
+libzpool_la_LDFLAGS = -pthread
+
+if !ASAN_ENABLED
+libzpool_la_LDFLAGS += -Wl,-z,defs
+endif
 
 if BUILD_FREEBSD
 libzpool_la_LIBADD += -lgeom