Get rid of const warnings in XSERVER_INPUT_EVENT dtrace probe calls

Use typedefs to work around dtrace dropping const qualifiers from probe
arguments when generating Xserver-dtrace.h.   Add new probes.h header to
avoid having to replicate these typedefs in every file with dtrace probes.

Gets rid of these warnings from gcc 4.8:
 getevents.c:1096:9:
  warning: passing argument 6 of '__dtrace_Xserver___input__event' discards
  'const' qualifier from pointer target type [enabled by default]
 getevents.c:1096:9:
  warning: passing argument 7 of '__dtrace_Xserver___input__event' disards
  'const' qualifier from pointer target type [enabled by default]
 getevents.c:1651:9:
  warning: passing argument 6 of '__dtrace_Xserver___input__event' disards
  'const' qualifier from pointer target type [enabled by default]
 getevents.c:1651:9:
  warning: passing argument 7 of '__dtrace_Xserver___input__event' disards
  'const' qualifier from pointer target type [enabled by default]
 getevents.c:1791:9:
  warning: passing argument 6 of '__dtrace_Xserver___input__event' disards
  'const' qualifier from pointer target type [enabled by default]
 getevents.c:1791:9:
  warning: passing argument 7 of '__dtrace_Xserver___input__event' disards
  'const' qualifier from pointer target type [enabled by default]
 getevents.c:1921:9:
  warning: passing argument 6 of '__dtrace_Xserver___input__event' disards
  'const' qualifier from pointer target type [enabled by default]
 getevents.c:1921:9:
  warning: passing argument 7 of '__dtrace_Xserver___input__event' disards
  'const' qualifier from pointer target type [enabled by default]

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>

2 files changed, 42 insertions, 0 deletions

diff --git a/include/Makefile.am b/include/Makefile.am
index 6578038a5..168b00f70 100644
--- a/include/Makefile.am
+++ b/include/Makefile.am
@@ -71,6 +71,7 @@ EXTRA_DIST = 	\
 	busfault.h dbus-core.h \
 	dix-config-apple-verbatim.h \
 	dixfontstubs.h eventconvert.h eventstr.h inpututils.h \
+	probes.h \
 	protocol-versions.h \
 	systemd-logind.h \
 	xsha1.h
diff --git a/include/probes.h b/include/probes.h
new file mode 100644
index 000000000..e9cdd3e8e
--- /dev/null
+++ b/include/probes.h
@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef XORG_PROBES_H
+#define XORG_PROBES_H
+
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
+/* definitions needed to include Dtrace probes in a source file */
+
+#if XSERVER_DTRACE
+#include <sys/types.h>
+typedef const char *string;
+typedef const uint8_t *const_uint8_p;
+typedef const double *const_double_p;
+#include "../dix/Xserver-dtrace.h"
+#endif
+
+#endif /* XORG_PROBES_H */