[PULL 3/9] build: Don't make object files for dtrace on macOS

[Stefan Hajnoczi <stefanha@redhat.com>]

From: Roman Bolshakov <r.bolshakov@yadro.com>

dtrace on macOS uses unresolved symbols with a special prefix to define
probes [1], only headers should be generated for USDT (dtrace(1)). But
it doesn't support backwards compatible no-op -G flag [2] and implicit
build rules fail.

1. https://markmail.org/message/6grq2ygr5nwdwsnb
2. https://markmail.org/message/5xrxt2w5m42nojkz

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Roman Bolshakov <r.bolshakov@yadro.com>
Message-id: 20200717093517.73397-4-r.bolshakov@yadro.com
Cc: Cameron Esfahani <dirty@apple.com>
Signed-off-by: Roman Bolshakov <r.bolshakov@yadro.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 Makefile.objs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Makefile.objs b/Makefile.objs
index d22b3b45d7..982f15ba30 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -211,5 +211,7 @@ trace-events-files = $(SRC_PATH)/trace-events $(trace-events-subdirs:%=$(SRC_PAT
 trace-obj-y = trace-root.o
 trace-obj-y += $(trace-events-subdirs:%=%/trace.o)
 trace-obj-$(CONFIG_TRACE_UST) += trace-ust-all.o
+ifneq ($(CONFIG_DARWIN),y)
 trace-obj-$(CONFIG_TRACE_DTRACE) += trace-dtrace-root.o
 trace-obj-$(CONFIG_TRACE_DTRACE) += $(trace-events-subdirs:%=%/trace-dtrace.o)
+endif
-- 
2.26.2