[PATCH 1/4] scripts/tracetool: Fix dtrace generation for macOS

[Roman Bolshakov]

dtrace USDT is fully supported since OS X 10.6. There are a few
peculiarities compared to other dtrace flavors.

1. It doesn't accept empty files.
2. It doesn't recognize bool type but accepts ANSI C _Bool.

Cc: Cameron Esfahani <dirty@apple.com>
Signed-off-by: Roman Bolshakov <r.bolshakov@yadro.com>
---
 scripts/tracetool/format/d.py | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/scripts/tracetool/format/d.py b/scripts/tracetool/format/d.py
index 0afb5f3f47..be4a2aa254 100644
--- a/scripts/tracetool/format/d.py
+++ b/scripts/tracetool/format/d.py
@@ -13,6 +13,7 @@ __email__      = "stefanha@redhat.com"
 
 
 from tracetool import out
+from sys import platform
 
 
 # Reserved keywords from
@@ -34,7 +35,8 @@ def generate(events, backend, group):
 
     # SystemTap's dtrace(1) warns about empty "provider qemu {}" but is happy
     # with an empty file.  Avoid the warning.
-    if not events:
+    # But dtrace on macOS can't deal with empty files.
+    if not events and platform != "darwin":
         return
 
     out('/* This file is autogenerated by tracetool, do not edit. */'
@@ -44,6 +46,11 @@ def generate(events, backend, group):
     for e in events:
         args = []
         for type_, name in e.args:
+            if platform == "darwin":
+                if type_ == 'bool':
+                    type_ = '_Bool'
+                if type_ == 'bool *':
+                    type_ = '_Bool *'
             if name in RESERVED_WORDS:
                 name += '_'
             args.append(type_ + ' ' + name)
-- 
2.26.1