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[libvirt] [PATCH] build: fix build with newer gnutls

Building with gnutls 3.2.0 (such as shipped with current cygwin) fails

rpc/virnettlscontext.c: In function 'virNetTLSSessionGetKeySize':
rpc/virnettlscontext.c:1358:5: error: implicit declaration of function 'gnutls_cipher_get_key_size' [-Wimplicit-function-declaration]

Yeah, it's stupid that gnutls broke API by moving their declaration
into a new header without including that header from the old one,
but it's easy enough to work around, all without breaking on gnutls
1.4.1 (hello RHEL 5) that lacked the new header.

* src/rpc/virnettlscontext.c (includes): Include additional header.
* configure.ac (gnutls): Check for <gnutls/crypto.h>.

Signed-off-by: Eric Blake <eblake redhat com>

Pushing under the build-breaker rule, once my testing completes
across multiple systems with various gnutls versions (1.4.1 in
RHEL5, 2.12.23 in Fedora 18, 3.2.0 in Cygwin).

 configure.ac               | 1 +
 src/rpc/virnettlscontext.c | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/configure.ac b/configure.ac
index 7041710..0b3d028 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1087,6 +1087,7 @@ if test "x$with_gnutls" != "xno"; then
   if test "$GNUTLS_FOUND" = "no"; then
     AC_CHECK_HEADER([gnutls/gnutls.h], [], [fail=1])
+    AC_CHECK_HEADERS([gnutls/crypto.h])
     AC_CHECK_LIB([gnutls], [gnutls_handshake],[], [fail=1], [-lgcrypt])

     test $fail = 0 && GNUTLS_FOUND=yes
diff --git a/src/rpc/virnettlscontext.c b/src/rpc/virnettlscontext.c
index e29c439..f2ac551 100644
--- a/src/rpc/virnettlscontext.c
+++ b/src/rpc/virnettlscontext.c
@@ -25,6 +25,9 @@
 #include <stdlib.h>

 #include <gnutls/gnutls.h>
+# include <gnutls/crypto.h>
 #include <gnutls/x509.h>
 #include "gnutls_1_0_compat.h"


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