Blame SOURCES/krb5-1.12-system-exts.patch

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On a glibc system, EAI_NODATA isn't defined unless _GNU_SOURCE is.  The
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recommended thing is to use AC_USE_SYSTEM_EXTENSIONS to get all extensions
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defined, but that would require fixups in varous other places, so we go for the
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smaller change here.
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--- krb5-1.11/src/lib/krb5/os/hostrealm.c
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+++ krb5-1.11/src/lib/krb5/os/hostrealm.c
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@@ -30,6 +30,9 @@
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  * OF THE POSSIBILITY OF SUCH DAMAGE.
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  */
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+/* We need to have EAI_NODATA and friends declared. */
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+#define _GNU_SOURCE
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+
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 #include "k5-int.h"
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 #include "os-proto.h"
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 #include "fake-addrinfo.h"
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--- krb5-1.11/src/lib/krb5/os/sendto_kdc.c
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+++ krb5-1.11/src/lib/krb5/os/sendto_kdc.c
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@@ -27,6 +27,9 @@
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 /* Send packet to KDC for realm; wait for response, retransmitting
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  * as necessary. */
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+/* We need to have EAI_NODATA and friends declared. */
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+#define _GNU_SOURCE
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+
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 #include "fake-addrinfo.h"
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 #include "k5-tls.h"
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 #include "k5-int.h"
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--- krb5-1.11/src/util/support/fake-addrinfo.c
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+++ krb5-1.11/src/util/support/fake-addrinfo.c
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@@ -101,6 +101,9 @@
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  *   these functions, and throw all this away.  Pleeease?  :-)
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  */
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+/* We need to have EAI_NODATA and friends declared. */
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+#define _GNU_SOURCE
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+
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 #include "port-sockets.h"
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 #include "socket-utils.h"
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 #include "k5-platform.h"
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--- krb5-1.12/src/lib/krad/client.c
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+++ krb5-1.12/src/lib/krad/client.c
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@@ -27,6 +27,9 @@
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  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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  */
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+/* We need to have EAI_NODATA and friends declared. */
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+#define _GNU_SOURCE
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+
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 #include <k5-queue.h>
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 #include "internal.h"
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