Bug 1253622 - Move the mozilla-trace.h generation into moz.build; r=ted

probes/moz.build

@@ -4,3 +4,15 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
+if CONFIG['HAVE_DTRACE']:
+    EXPORTS += [
+        '!mozilla-trace.h',
+    ]
+
+    GENERATED_FILES += [
+        'mozilla-trace.h',
+    ]
+
+    trace = GENERATED_FILES['mozilla-trace.h']
+    trace.script = 'trace-gen.py'
+    trace.inputs += ['mozilla-trace.d']

probes/trace-gen.py

@@ -0,0 +1,15 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+import subprocess
+
+def main(fp, input):
+    temporary_file = 'mozilla-trace.h.tmp'
+    subprocess.check_call(['dtrace', '-x', 'nolibs', '-h', '-s', input, '-o', temporary_file])
+
+    with open(temporary_file, 'r') as temporary_fp:
+        output = temporary_fp.read()
+    fp.write(output.replace('if _DTRACE_VERSION', 'ifdef INCLUDE_MOZILLA_DTRACE'))
+    os.remove(temporary_file)