trace: introduce a formal group name for trace events

The declarations in the generated-tracers.h file are
assuming there's only ever going to be one instance
of this header, as they are not namespaced. When we
have one header per event group, if a single source
file needs to include multiple sets of trace events,
the symbols will all clash.

This change thus introduces a '--group NAME' arg to the
'tracetool' program. This will cause all the symbols in
the generated header files to be given a unique namespace.

If no group is given, the group name 'common' is used,
which is suitable for the current usage where there is
only one global trace-events file used for code generation.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Reviewed-by: Lluís Vilanova <vilanova@ac.upc.edu>
Message-id: 1475588159-30598-21-git-send-email-berrange@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/scripts/tracetool/format/__init__.py b/scripts/tracetool/format/__init__.py
index 812570ff6f..cf6e0e2da5 100644
--- a/scripts/tracetool/format/__init__.py
+++ b/scripts/tracetool/format/__init__.py
@@ -74,7 +74,7 @@ def exists(name):
     return tracetool.try_import("tracetool.format." + name)[1]
 
 
-def generate(events, format, backend):
+def generate(events, format, backend, group):
     if not exists(format):
         raise ValueError("unknown format: %s" % format)
     format = format.replace("-", "_")
@@ -82,4 +82,4 @@ def generate(events, format, backend):
                                 "generate")[1]
     if func is None:
         raise AttributeError("format has no 'generate': %s" % format)
-    func(events, backend)
+    func(events, backend, group)