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[Xen-devel] [PATCH] libxl: fix build with older glibc

Commit 2b02882ebbbc "libxl: add infrastructure to track and query
'recent' domids" added a call to clock_gettime() into libxl. The man-
page for this states:

"Link with -lrt (only for glibc versions before 2.17)."

Unfortunately Centos 6 does have an glibc prior to that version, and the
libxl Makefile was not updated to add '-lrt' so the build will fail in
that environment.

This patch simply adds '-lrt' to LIBXL_LIBS unconditionally, as it does
no harm in newer environments.

Signed-off-by: Paul Durrant <pdurrant@xxxxxxxxxx>
Fixes: 2b02882ebbbc ("libxl: add infrastructure to track and query 'recent' 
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Wei Liu <wl@xxxxxxx>
Cc: Anthony PERARD <anthony.perard@xxxxxxxxxx>
 tools/libxl/Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/libxl/Makefile b/tools/libxl/Makefile
index ed41e4ee3e..69fcf21577 100644
--- a/tools/libxl/Makefile
+++ b/tools/libxl/Makefile
@@ -24,6 +24,9 @@ LIBXL_LIBS = $(LDLIBS_libxentoollog) $(LDLIBS_libxenevtchn) 
 ifeq ($(CONFIG_LIBNL),y)
+ifeq ($(CONFIG_Linux),y)
+LIBXL_LIBS += -lrt
 CFLAGS_LIBXL += $(CFLAGS_libxentoollog)
 CFLAGS_LIBXL += $(CFLAGS_libxentoolcore)

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