Patchwork [v2] build: Use separate makefile for "trace/"

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Submitter Lluís Vilanova
Date Dec. 14, 2012, 8:40 p.m.
Message ID <20121214204012.13003.12275.stgit@fimbulvetr.bsc.es>
Download mbox | patch
Permalink /patch/206556/
State New
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Comments

Lluís Vilanova - Dec. 14, 2012, 8:40 p.m.
Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
--
Changes in v2:

* Do not depend on "qemu-timer-common.o".
* Use "$(obj)" in rules to refer to the build sub-directory.
* Remove dependencies against "$(GENERATED_HEADERS)".

Cc: Paolo Bonzini <pbonzini@redhat.com>
---
 .gitignore                          |    8 ++--
 Makefile                            |   15 +++++---
 Makefile.objs                       |   64 ++------------------------------
 scripts/tracetool/backend/dtrace.py |    2 +
 scripts/tracetool/format/h.py       |    6 ++-
 trace.h                             |    6 +++
 trace/Makefile.objs                 |   70 +++++++++++++++++++++++++++++++++++
 7 files changed, 96 insertions(+), 75 deletions(-)
 create mode 100644 trace.h
 create mode 100644 trace/Makefile.objs
Lluís Vilanova - Dec. 14, 2012, 9:13 p.m.
I'm really sorry for sending this multiple times.

Lluís Vilanova writes:

> Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
> --
> Changes in v2:

> * Do not depend on "qemu-timer-common.o".
> * Use "$(obj)" in rules to refer to the build sub-directory.
> * Remove dependencies against "$(GENERATED_HEADERS)".

> Cc: Paolo Bonzini <pbonzini@redhat.com>
> ---
>  .gitignore                          |    8 ++--
>  Makefile                            |   15 +++++---
>  Makefile.objs                       |   64 ++------------------------------
>  scripts/tracetool/backend/dtrace.py |    2 +
>  scripts/tracetool/format/h.py       |    6 ++-
>  trace.h                             |    6 +++
>  trace/Makefile.objs                 |   70 +++++++++++++++++++++++++++++++++++
>  7 files changed, 96 insertions(+), 75 deletions(-)
>  create mode 100644 trace.h
>  create mode 100644 trace/Makefile.objs

> diff --git a/.gitignore b/.gitignore
> index bd6ba1c..0b75915 100644
> --- a/.gitignore
> +++ b/.gitignore
> @@ -2,10 +2,10 @@ config-devices.*
>  config-all-devices.*
>  config-host.*
>  config-target.*
> -trace.h
> -trace.c
> -trace-dtrace.h
> -trace-dtrace.dtrace
> +trace/generated-tracers.h
> +trace/generated-tracers.c
> +trace/generated-tracers-dtrace.h
> +trace/generated-tracers-dtrace.dtrace
>  *-timestamp
>  *-softmmu
>  *-darwin-user
> diff --git a/Makefile b/Makefile
> index e9d6848..21a7912 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -31,12 +31,15 @@ ifneq ($(filter-out %clean,$(MAKECMDGOALS)),$(if $(MAKECMDGOALS),,fail))
>  endif
>  endif
 
> -GENERATED_HEADERS = config-host.h trace.h qemu-options.def
> +GENERATED_HEADERS = config-host.h qemu-options.def
> +GENERATED_HEADERS += qmp-commands.h qapi-types.h qapi-visit.h
> +GENERATED_SOURCES += qmp-marshal.c qapi-types.c qapi-visit.c
> +
> +GENERATED_HEADERS += trace/generated-tracers.h
>  ifeq ($(TRACE_BACKEND),dtrace)
> -GENERATED_HEADERS += trace-dtrace.h
> +GENERATED_HEADERS += trace/generated-tracers-dtrace.h
>  endif
> -GENERATED_HEADERS += qmp-commands.h qapi-types.h qapi-visit.h
> -GENERATED_SOURCES += qmp-marshal.c qapi-types.c qapi-visit.c trace.c
> +GENERATED_SOURCES += trace/generated-tracers.c
 
>  # Don't try to regenerate Makefile or configure
>  # We don't generate any of them
> @@ -252,9 +255,9 @@ clean:
>  	rm -f *.a *.lo $(TOOLS) $(HELPERS-y) qemu-ga TAGS cscope.* *.pod *~ */*~
>  	rm -Rf .libs
>  	rm -f qemu-img-cmds.h
> -	rm -f trace-dtrace.dtrace trace-dtrace.dtrace-timestamp
>  	@# May not be present in GENERATED_HEADERS
> -	rm -f trace-dtrace.h trace-dtrace.h-timestamp
> +	rm -f trace/generated-tracers-dtrace.dtrace*
> +	rm -f trace/generated-tracers-dtrace.h*
>  	rm -f $(foreach f,$(GENERATED_HEADERS),$(f) $(f)-timestamp)
>  	rm -f $(foreach f,$(GENERATED_SOURCES),$(f) $(f)-timestamp)
>  	rm -rf qapi-generated
> diff --git a/Makefile.objs b/Makefile.objs
> index 3c7abca..24832a2 100644
> --- a/Makefile.objs
> +++ b/Makefile.objs
> @@ -147,66 +147,7 @@ libdis-$(CONFIG_LM32_DIS) += lm32-dis.o
>  ######################################################################
>  # trace
 
> -ifeq ($(TRACE_BACKEND),dtrace)
> -TRACE_H_EXTRA_DEPS=trace-dtrace.h
> -endif
> -trace.h: trace.h-timestamp $(TRACE_H_EXTRA_DEPS)
> -trace.h-timestamp: $(SRC_PATH)/trace-events $(BUILD_DIR)/config-host.mak
> -	$(call quiet-command,$(TRACETOOL) \
> -		--format=h \
> -		--backend=$(TRACE_BACKEND) \
> -		< $< > $@,"  GEN   trace.h")
> -	@cmp -s $@ trace.h || cp $@ trace.h
> -
> -trace.c: trace.c-timestamp
> -trace.c-timestamp: $(SRC_PATH)/trace-events $(BUILD_DIR)/config-host.mak
> -	$(call quiet-command,$(TRACETOOL) \
> -		--format=c \
> -		--backend=$(TRACE_BACKEND) \
> -		< $< > $@,"  GEN   trace.c")
> -	@cmp -s $@ trace.c || cp $@ trace.c
> -
> -trace.o: trace.c $(GENERATED_HEADERS)
> -
> -trace-dtrace.h: trace-dtrace.dtrace
> -	$(call quiet-command,dtrace -o $@ -h -s $<, "  GEN   trace-dtrace.h")
> -
> -# Normal practice is to name DTrace probe file with a '.d' extension
> -# but that gets picked up by QEMU's Makefile as an external dependency
> -# rule file. So we use '.dtrace' instead
> -trace-dtrace.dtrace: trace-dtrace.dtrace-timestamp
> -trace-dtrace.dtrace-timestamp: $(SRC_PATH)/trace-events $(BUILD_DIR)/config-host.mak
> -	$(call quiet-command,$(TRACETOOL) \
> -		--format=d \
> -		--backend=$(TRACE_BACKEND) \
> -		< $< > $@,"  GEN   trace-dtrace.dtrace")
> -	@cmp -s $@ trace-dtrace.dtrace || cp $@ trace-dtrace.dtrace
> -
> -trace-dtrace.o: trace-dtrace.dtrace $(GENERATED_HEADERS)
> -	$(call quiet-command,dtrace -o $@ -G -s $<, "  GEN   trace-dtrace.o")
> -
> -ifeq ($(LIBTOOL),)
> -trace-dtrace.lo: trace-dtrace.dtrace
> -	@echo "missing libtool. please install and rerun configure."; exit 1
> -else
> -trace-dtrace.lo: trace-dtrace.dtrace
> -	$(call quiet-command,$(LIBTOOL) --mode=compile --tag=CC dtrace -o $@ -G -s $<, "  lt GEN trace-dtrace.o")
> -endif
> -
> -trace/simple.o: trace/simple.c $(GENERATED_HEADERS)
> -
> -trace-obj-$(CONFIG_TRACE_DTRACE) += trace-dtrace.o
> -ifneq ($(TRACE_BACKEND),dtrace)
> -trace-obj-y = trace.o
> -endif
> -
> -trace-obj-$(CONFIG_TRACE_DEFAULT) += trace/default.o
> -trace-obj-$(CONFIG_TRACE_SIMPLE) += trace/simple.o
> -trace-obj-$(CONFIG_TRACE_SIMPLE) += qemu-timer-common.o
> -trace-obj-$(CONFIG_TRACE_STDERR) += trace/stderr.o
> -trace-obj-y += trace/control.o
> -
> -$(trace-obj-y): $(GENERATED_HEADERS)
> +trace-obj-y += trace/
 
>  ######################################################################
>  # smartcard
> @@ -250,5 +191,6 @@ nested-vars += \
>  	block-obj-y \
>  	user-obj-y \
>  	common-obj-y \
> -	extra-obj-y
> +	extra-obj-y \
> +	trace-obj-y
>  dummy := $(call unnest-vars)
> diff --git a/scripts/tracetool/backend/dtrace.py b/scripts/tracetool/backend/dtrace.py
> index 23c43e2..ad5eb3b 100644
> --- a/scripts/tracetool/backend/dtrace.py
> +++ b/scripts/tracetool/backend/dtrace.py
> @@ -37,7 +37,7 @@ def c(events):
 
 
>  def h(events):
> -    out('#include "trace-dtrace.h"',
> +    out('#include "trace/generated-tracers-dtrace.h"',
>          '')
 
>      for e in events:
> diff --git a/scripts/tracetool/format/h.py b/scripts/tracetool/format/h.py
> index 6ffb3c2..9a58de1 100644
> --- a/scripts/tracetool/format/h.py
> +++ b/scripts/tracetool/format/h.py
> @@ -19,8 +19,8 @@ from tracetool import out
>  def begin(events):
>      out('/* This file is autogenerated by tracetool, do not edit. */',
>          '',
> -        '#ifndef TRACE_H',
> -        '#define TRACE_H',
> +        '#ifndef TRACE__GENERATED_TRACERS_H',
> +        '#define TRACE__GENERATED_TRACERS_H',
>          '',
>          '#include "qemu-common.h"')
 
> @@ -32,7 +32,7 @@ def end(events):
>              enabled = 1
>          out('#define TRACE_%s_ENABLED %d' % (e.name.upper(), enabled))
>      out('',
> -        '#endif /* TRACE_H */')
> +        '#endif /* TRACE__GENERATED_TRACERS_H */')
 
>  def nop(events):
>      for e in events:
> diff --git a/trace.h b/trace.h
> new file mode 100644
> index 0000000..c15f498
> --- /dev/null
> +++ b/trace.h
> @@ -0,0 +1,6 @@
> +#ifndef TRACE_H
> +#define TRACE_H
> +
> +#include "trace/generated-tracers.h"
> +
> +#endif  /* TRACE_H */
> diff --git a/trace/Makefile.objs b/trace/Makefile.objs
> new file mode 100644
> index 0000000..b791723
> --- /dev/null
> +++ b/trace/Makefile.objs
> @@ -0,0 +1,70 @@
> +# -*- mode: makefile -*-
> +
> +######################################################################
> +# Auto-generated tracing routines
> +
> +ifeq ($(TRACE_BACKEND),dtrace)
> +TRACE_H_EXTRA_DEPS=$(obj)/generated-tracers-dtrace.h
> +endif
> +$(obj)/generated-tracers.h: $(obj)/generated-tracers.h-timestamp $(TRACE_H_EXTRA_DEPS)
> +$(obj)/generated-tracers.h-timestamp: $(SRC_PATH)/trace-events $(BUILD_DIR)/config-host.mak
> +	$(call quiet-command,$(TRACETOOL) \
> +		--format=h \
> +		--backend=$(TRACE_BACKEND) \
> +		< $< > $@,"  GEN   $(patsubst %-timestamp,%,$@)")
> +	@cmp -s $@ $(patsubst %-timestamp,%,$@) || cp $@ $(patsubst %-timestamp,%,$@)
> +
> +$(obj)/generated-tracers.c: $(obj)/generated-tracers.c-timestamp
> +$(obj)/generated-tracers.c-timestamp: $(SRC_PATH)/trace-events $(BUILD_DIR)/config-host.mak
> +	$(call quiet-command,$(TRACETOOL) \
> +		--format=c \
> +		--backend=$(TRACE_BACKEND) \
> +		< $< > $@,"  GEN   $(patsubst %-timestamp,%,$@)")
> +	@cmp -s $@ $(patsubst %-timestamp,%,$@) || cp $@ $(patsubst %-timestamp,%,$@)
> +
> +$(obj)/generated-tracers.o: $(obj)/generated-tracers.c $(obj)/generated-tracers.h
> +
> +ifneq ($(TRACE_BACKEND),dtrace)
> +trace-obj-y += generated-tracers.o
> +endif
> +
> +
> +######################################################################
> +# Auto-generated DTrace code
> +
> +# Normal practice is to name DTrace probe file with a '.d' extension
> +# but that gets picked up by QEMU's Makefile as an external dependency
> +# rule file. So we use '.dtrace' instead
> +$(obj)/generated-tracers-dtrace.dtrace: $(obj)/generated-tracers-dtrace.dtrace-timestamp
> +$(obj)/generated-tracers-dtrace.dtrace-timestamp: $(SRC_PATH)/trace-events $(BUILD_DIR)/config-host.mak
> +	$(call quiet-command,$(TRACETOOL) \
> +		--format=d \
> +		--backend=$(TRACE_BACKEND) \
> +		< $< > $@,"  GEN   $(patsubst %-timestamp,%,$@)")
> +	@cmp -s $@ $(patsubst %-timestamp,%,$@) || cp $@ $(patsubst %-timestamp,%,$@)
> +
> +$(obj)/generated-tracers-dtrace.h: trace/generated-tracers-dtrace.dtrace
> +	$(call quiet-command,dtrace -o $@ -h -s $<, "  GEN   $@")
> +
> +$(obj)/generated-tracers-dtrace.o: trace/generated-tracers-dtrace.dtrace
> +	$(call quiet-command,dtrace -o $@ -G -s $<, "  GEN   $@")
> +
> +trace-obj-$(CONFIG_TRACE_DTRACE) += generated-tracers-dtrace.o
> +
> +
> +ifeq ($(LIBTOOL),)
> +$(obj)/generated-tracers-dtrace.lo: $(obj)/generated-tracers-dtrace.dtrace
> +	@echo "missing libtool. please install and rerun configure."; exit 1
> +else
> +$(obj)/generated-tracers-dtrace.lo: $(obj)/generated-tracers-dtrace.dtrace
> +	$(call quiet-command,$(LIBTOOL) --mode=compile --tag=CC dtrace -o $@ -G -s $<, "  lt GEN $@")
> +endif
> +
> +
> +######################################################################
> +# Backend code
> +
> +trace-obj-$(CONFIG_TRACE_DEFAULT) += default.o
> +trace-obj-$(CONFIG_TRACE_SIMPLE) += simple.o
> +trace-obj-$(CONFIG_TRACE_STDERR) += stderr.o
> +trace-obj-y += control.o

Patch

diff --git a/.gitignore b/.gitignore
index bd6ba1c..0b75915 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,10 +2,10 @@  config-devices.*
 config-all-devices.*
 config-host.*
 config-target.*
-trace.h
-trace.c
-trace-dtrace.h
-trace-dtrace.dtrace
+trace/generated-tracers.h
+trace/generated-tracers.c
+trace/generated-tracers-dtrace.h
+trace/generated-tracers-dtrace.dtrace
 *-timestamp
 *-softmmu
 *-darwin-user
diff --git a/Makefile b/Makefile
index e9d6848..21a7912 100644
--- a/Makefile
+++ b/Makefile
@@ -31,12 +31,15 @@  ifneq ($(filter-out %clean,$(MAKECMDGOALS)),$(if $(MAKECMDGOALS),,fail))
 endif
 endif
 
-GENERATED_HEADERS = config-host.h trace.h qemu-options.def
+GENERATED_HEADERS = config-host.h qemu-options.def
+GENERATED_HEADERS += qmp-commands.h qapi-types.h qapi-visit.h
+GENERATED_SOURCES += qmp-marshal.c qapi-types.c qapi-visit.c
+
+GENERATED_HEADERS += trace/generated-tracers.h
 ifeq ($(TRACE_BACKEND),dtrace)
-GENERATED_HEADERS += trace-dtrace.h
+GENERATED_HEADERS += trace/generated-tracers-dtrace.h
 endif
-GENERATED_HEADERS += qmp-commands.h qapi-types.h qapi-visit.h
-GENERATED_SOURCES += qmp-marshal.c qapi-types.c qapi-visit.c trace.c
+GENERATED_SOURCES += trace/generated-tracers.c
 
 # Don't try to regenerate Makefile or configure
 # We don't generate any of them
@@ -252,9 +255,9 @@  clean:
 	rm -f *.a *.lo $(TOOLS) $(HELPERS-y) qemu-ga TAGS cscope.* *.pod *~ */*~
 	rm -Rf .libs
 	rm -f qemu-img-cmds.h
-	rm -f trace-dtrace.dtrace trace-dtrace.dtrace-timestamp
 	@# May not be present in GENERATED_HEADERS
-	rm -f trace-dtrace.h trace-dtrace.h-timestamp
+	rm -f trace/generated-tracers-dtrace.dtrace*
+	rm -f trace/generated-tracers-dtrace.h*
 	rm -f $(foreach f,$(GENERATED_HEADERS),$(f) $(f)-timestamp)
 	rm -f $(foreach f,$(GENERATED_SOURCES),$(f) $(f)-timestamp)
 	rm -rf qapi-generated
diff --git a/Makefile.objs b/Makefile.objs
index 3c7abca..24832a2 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -147,66 +147,7 @@  libdis-$(CONFIG_LM32_DIS) += lm32-dis.o
 ######################################################################
 # trace
 
-ifeq ($(TRACE_BACKEND),dtrace)
-TRACE_H_EXTRA_DEPS=trace-dtrace.h
-endif
-trace.h: trace.h-timestamp $(TRACE_H_EXTRA_DEPS)
-trace.h-timestamp: $(SRC_PATH)/trace-events $(BUILD_DIR)/config-host.mak
-	$(call quiet-command,$(TRACETOOL) \
-		--format=h \
-		--backend=$(TRACE_BACKEND) \
-		< $< > $@,"  GEN   trace.h")
-	@cmp -s $@ trace.h || cp $@ trace.h
-
-trace.c: trace.c-timestamp
-trace.c-timestamp: $(SRC_PATH)/trace-events $(BUILD_DIR)/config-host.mak
-	$(call quiet-command,$(TRACETOOL) \
-		--format=c \
-		--backend=$(TRACE_BACKEND) \
-		< $< > $@,"  GEN   trace.c")
-	@cmp -s $@ trace.c || cp $@ trace.c
-
-trace.o: trace.c $(GENERATED_HEADERS)
-
-trace-dtrace.h: trace-dtrace.dtrace
-	$(call quiet-command,dtrace -o $@ -h -s $<, "  GEN   trace-dtrace.h")
-
-# Normal practice is to name DTrace probe file with a '.d' extension
-# but that gets picked up by QEMU's Makefile as an external dependency
-# rule file. So we use '.dtrace' instead
-trace-dtrace.dtrace: trace-dtrace.dtrace-timestamp
-trace-dtrace.dtrace-timestamp: $(SRC_PATH)/trace-events $(BUILD_DIR)/config-host.mak
-	$(call quiet-command,$(TRACETOOL) \
-		--format=d \
-		--backend=$(TRACE_BACKEND) \
-		< $< > $@,"  GEN   trace-dtrace.dtrace")
-	@cmp -s $@ trace-dtrace.dtrace || cp $@ trace-dtrace.dtrace
-
-trace-dtrace.o: trace-dtrace.dtrace $(GENERATED_HEADERS)
-	$(call quiet-command,dtrace -o $@ -G -s $<, "  GEN   trace-dtrace.o")
-
-ifeq ($(LIBTOOL),)
-trace-dtrace.lo: trace-dtrace.dtrace
-	@echo "missing libtool. please install and rerun configure."; exit 1
-else
-trace-dtrace.lo: trace-dtrace.dtrace
-	$(call quiet-command,$(LIBTOOL) --mode=compile --tag=CC dtrace -o $@ -G -s $<, "  lt GEN trace-dtrace.o")
-endif
-
-trace/simple.o: trace/simple.c $(GENERATED_HEADERS)
-
-trace-obj-$(CONFIG_TRACE_DTRACE) += trace-dtrace.o
-ifneq ($(TRACE_BACKEND),dtrace)
-trace-obj-y = trace.o
-endif
-
-trace-obj-$(CONFIG_TRACE_DEFAULT) += trace/default.o
-trace-obj-$(CONFIG_TRACE_SIMPLE) += trace/simple.o
-trace-obj-$(CONFIG_TRACE_SIMPLE) += qemu-timer-common.o
-trace-obj-$(CONFIG_TRACE_STDERR) += trace/stderr.o
-trace-obj-y += trace/control.o
-
-$(trace-obj-y): $(GENERATED_HEADERS)
+trace-obj-y += trace/
 
 ######################################################################
 # smartcard
@@ -250,5 +191,6 @@  nested-vars += \
 	block-obj-y \
 	user-obj-y \
 	common-obj-y \
-	extra-obj-y
+	extra-obj-y \
+	trace-obj-y
 dummy := $(call unnest-vars)
diff --git a/scripts/tracetool/backend/dtrace.py b/scripts/tracetool/backend/dtrace.py
index 23c43e2..ad5eb3b 100644
--- a/scripts/tracetool/backend/dtrace.py
+++ b/scripts/tracetool/backend/dtrace.py
@@ -37,7 +37,7 @@  def c(events):
 
 
 def h(events):
-    out('#include "trace-dtrace.h"',
+    out('#include "trace/generated-tracers-dtrace.h"',
         '')
 
     for e in events:
diff --git a/scripts/tracetool/format/h.py b/scripts/tracetool/format/h.py
index 6ffb3c2..9a58de1 100644
--- a/scripts/tracetool/format/h.py
+++ b/scripts/tracetool/format/h.py
@@ -19,8 +19,8 @@  from tracetool import out
 def begin(events):
     out('/* This file is autogenerated by tracetool, do not edit. */',
         '',
-        '#ifndef TRACE_H',
-        '#define TRACE_H',
+        '#ifndef TRACE__GENERATED_TRACERS_H',
+        '#define TRACE__GENERATED_TRACERS_H',
         '',
         '#include "qemu-common.h"')
 
@@ -32,7 +32,7 @@  def end(events):
             enabled = 1
         out('#define TRACE_%s_ENABLED %d' % (e.name.upper(), enabled))
     out('',
-        '#endif /* TRACE_H */')
+        '#endif /* TRACE__GENERATED_TRACERS_H */')
 
 def nop(events):
     for e in events:
diff --git a/trace.h b/trace.h
new file mode 100644
index 0000000..c15f498
--- /dev/null
+++ b/trace.h
@@ -0,0 +1,6 @@ 
+#ifndef TRACE_H
+#define TRACE_H
+
+#include "trace/generated-tracers.h"
+
+#endif  /* TRACE_H */
diff --git a/trace/Makefile.objs b/trace/Makefile.objs
new file mode 100644
index 0000000..b791723
--- /dev/null
+++ b/trace/Makefile.objs
@@ -0,0 +1,70 @@ 
+# -*- mode: makefile -*-
+
+######################################################################
+# Auto-generated tracing routines
+
+ifeq ($(TRACE_BACKEND),dtrace)
+TRACE_H_EXTRA_DEPS=$(obj)/generated-tracers-dtrace.h
+endif
+$(obj)/generated-tracers.h: $(obj)/generated-tracers.h-timestamp $(TRACE_H_EXTRA_DEPS)
+$(obj)/generated-tracers.h-timestamp: $(SRC_PATH)/trace-events $(BUILD_DIR)/config-host.mak
+	$(call quiet-command,$(TRACETOOL) \
+		--format=h \
+		--backend=$(TRACE_BACKEND) \
+		< $< > $@,"  GEN   $(patsubst %-timestamp,%,$@)")
+	@cmp -s $@ $(patsubst %-timestamp,%,$@) || cp $@ $(patsubst %-timestamp,%,$@)
+
+$(obj)/generated-tracers.c: $(obj)/generated-tracers.c-timestamp
+$(obj)/generated-tracers.c-timestamp: $(SRC_PATH)/trace-events $(BUILD_DIR)/config-host.mak
+	$(call quiet-command,$(TRACETOOL) \
+		--format=c \
+		--backend=$(TRACE_BACKEND) \
+		< $< > $@,"  GEN   $(patsubst %-timestamp,%,$@)")
+	@cmp -s $@ $(patsubst %-timestamp,%,$@) || cp $@ $(patsubst %-timestamp,%,$@)
+
+$(obj)/generated-tracers.o: $(obj)/generated-tracers.c $(obj)/generated-tracers.h
+
+ifneq ($(TRACE_BACKEND),dtrace)
+trace-obj-y += generated-tracers.o
+endif
+
+
+######################################################################
+# Auto-generated DTrace code
+
+# Normal practice is to name DTrace probe file with a '.d' extension
+# but that gets picked up by QEMU's Makefile as an external dependency
+# rule file. So we use '.dtrace' instead
+$(obj)/generated-tracers-dtrace.dtrace: $(obj)/generated-tracers-dtrace.dtrace-timestamp
+$(obj)/generated-tracers-dtrace.dtrace-timestamp: $(SRC_PATH)/trace-events $(BUILD_DIR)/config-host.mak
+	$(call quiet-command,$(TRACETOOL) \
+		--format=d \
+		--backend=$(TRACE_BACKEND) \
+		< $< > $@,"  GEN   $(patsubst %-timestamp,%,$@)")
+	@cmp -s $@ $(patsubst %-timestamp,%,$@) || cp $@ $(patsubst %-timestamp,%,$@)
+
+$(obj)/generated-tracers-dtrace.h: trace/generated-tracers-dtrace.dtrace
+	$(call quiet-command,dtrace -o $@ -h -s $<, "  GEN   $@")
+
+$(obj)/generated-tracers-dtrace.o: trace/generated-tracers-dtrace.dtrace
+	$(call quiet-command,dtrace -o $@ -G -s $<, "  GEN   $@")
+
+trace-obj-$(CONFIG_TRACE_DTRACE) += generated-tracers-dtrace.o
+
+
+ifeq ($(LIBTOOL),)
+$(obj)/generated-tracers-dtrace.lo: $(obj)/generated-tracers-dtrace.dtrace
+	@echo "missing libtool. please install and rerun configure."; exit 1
+else
+$(obj)/generated-tracers-dtrace.lo: $(obj)/generated-tracers-dtrace.dtrace
+	$(call quiet-command,$(LIBTOOL) --mode=compile --tag=CC dtrace -o $@ -G -s $<, "  lt GEN $@")
+endif
+
+
+######################################################################
+# Backend code
+
+trace-obj-$(CONFIG_TRACE_DEFAULT) += default.o
+trace-obj-$(CONFIG_TRACE_SIMPLE) += simple.o
+trace-obj-$(CONFIG_TRACE_STDERR) += stderr.o
+trace-obj-y += control.o