trace: switch to modular code generation for sub-directories

Introduce rules in the top level Makefile that are able to generate
trace.[ch] files in every subdirectory which has a trace-events file.

The top level directory is handled specially, so instead of creating
trace.h, it creates trace-root.h. This allows sub-directories to
include the top level trace-root.h file, without ambiguity wrt to
the trace.g file in the current sub-dir.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Message-id: 20170125161417.31949-7-berrange@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/vl.c b/vl.c
index 0b72b12878..b4eaf03734 100644
--- a/vl.c
+++ b/vl.c
@@ -110,7 +110,7 @@ int main(int argc, char **argv)
 
 #include "slirp/libslirp.h"
 
-#include "trace.h"
+#include "trace-root.h"
 #include "trace/control.h"
 #include "qemu/queue.h"
 #include "sysemu/arch_init.h"