build: rename all symbols to use sysprof_ as prefix

As we gain in usage, we need to be more careful about using a prefix
that will not collide with other symbols. So version 3 of our ABI will
change to using Sysprof/SYSPROF/sysprof as the various prefixes.

The soname/api version bump will happen later on this branch so that
things are easier to test up until then.

src/libsysprof-capture/sysprof-clock.c

@@ -0,0 +1,58 @@
+/* sysprof-clock.c
+ *
+ * Copyright 2016-2019 Christian Hergert <chergert@redhat.com>
+ *
+ * This file is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This file is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#define G_LOG_DOMAIN "sysprof-clock"
+
+#include "config.h"
+
+#include "sysprof-clock.h"
+
+gint sysprof_clock = -1;
+
+void
+sysprof_clock_init (void)
+{
+  static const gint clock_ids[] = {
+    CLOCK_MONOTONIC,
+    CLOCK_MONOTONIC_RAW,
+#ifdef __linux__
+    CLOCK_MONOTONIC_COARSE,
+    CLOCK_REALTIME_COARSE,
+#endif
+    CLOCK_REALTIME,
+  };
+
+  if (sysprof_clock != -1)
+    return;
+
+  for (guint i = 0; i < G_N_ELEMENTS (clock_ids); i++)
+    {
+      struct timespec ts;
+      int clock_id = clock_ids [i];
+
+      if (0 == clock_gettime (clock_id, &ts))
+        {
+          sysprof_clock = clock_id;
+          return;
+        }
+    }
+
+  g_assert_not_reached ();
+}