Always compile x509-utils.c and add a fallback when GNUTLS is
unavailable.

Signed-off-by: Zhuoying Cai <zycai@linux.ibm.com>
---
 crypto/meson.build  |  5 +----
 crypto/x509-utils.c | 16 ++++++++++++++++
 2 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/crypto/meson.build b/crypto/meson.build
index 735635de1f..0614bfa914 100644
--- a/crypto/meson.build
+++ b/crypto/meson.build
@@ -22,12 +22,9 @@ crypto_ss.add(files(
   'tlscredsx509.c',
   'tlssession.c',
   'rsakey.c',
+  'x509-utils.c',
 ))
 
-if gnutls.found()
-  crypto_ss.add(files('x509-utils.c'))
-endif
-
 if nettle.found()
   crypto_ss.add(nettle, files('hash-nettle.c', 'hmac-nettle.c', 'pbkdf-nettle.c'))
   if hogweed.found()
diff --git a/crypto/x509-utils.c b/crypto/x509-utils.c
index 39bb6d4d8c..6176a88653 100644
--- a/crypto/x509-utils.c
+++ b/crypto/x509-utils.c
@@ -11,6 +11,8 @@
 #include "qemu/osdep.h"
 #include "qapi/error.h"
 #include "crypto/x509-utils.h"
+
+#ifdef CONFIG_GNUTLS
 #include <gnutls/gnutls.h>
 #include <gnutls/crypto.h>
 #include <gnutls/x509.h>
@@ -78,3 +80,17 @@ int qcrypto_get_x509_cert_fingerprint(uint8_t *cert, size_t size,
     gnutls_x509_crt_deinit(crt);
     return ret;
 }
+
+#else /* ! CONFIG_GNUTLS */
+
+int qcrypto_get_x509_cert_fingerprint(uint8_t *cert, size_t size,
+                                      QCryptoHashAlgo hash,
+                                      uint8_t *result,
+                                      size_t *resultlen,
+                                      Error **errp)
+{
+    error_setg(errp, "GNUTLS is required to get fingerprint");
+    return -1;
+}
+
+#endif /* ! CONFIG_GNUTLS */
-- 
2.50.1