[Xen-devel] [PATCH for 4.6 v2] configure: don't silently disable systemd support

[Wei Liu <wei.liu2@xxxxxxxxxx>]

Originally when user runs ./configure --enable-systemd and systemd
development library is not available the build system silently disables
systemd support. This is not in line with normal expectation.

Instead, configure should error out when user has asked for systemd
support but development libraries can't be found.

Reported-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
---
v2: invert the test to check for explicit "yes" value.

Please rerun ./autogen.sh.
---
 m4/systemd.m4 | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/m4/systemd.m4 b/m4/systemd.m4
index 8284993..e4b1aa5 100644
--- a/m4/systemd.m4
+++ b/m4/systemd.m4
@@ -85,7 +85,11 @@ AC_DEFUN([AX_CHECK_SYSTEMD], [
                AC_DEFINE([HAVE_SYSTEMD], [1], [Systemd available and enabled])
                        systemd=y
                        AX_CHECK_SYSTEMD_LIBS()
-           ],[systemd=n])
+           ],[
+               AS_IF([test "x$enable_systemd" = "xyes"],
+                       [AC_MSG_ERROR([Unable to find systemd development 
library])],
+                       [systemd=n])
+           ])
        ],[systemd=n])
 ])
 
-- 
2.1.4


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