sim: common: move test-hw-events to top-level build

This is an internal developer target that isn't normally compiled,
but it can still be occasionally useful.  Move it to the top-level
build so we can kill off common/Make-common.in.

sim/Makefile.in

@@ -4585,6 +4585,12 @@ common/version.c-stamp: $(srcroot)/gdb/version.in $(srcroot)/bfd/version.h $(src
 	$(AM_V_at)$(SHELL) $(srcroot)/move-if-change $@.tmp $(@:-stamp=)
 	$(AM_V_at)touch $@
 
+.PRECIOUS: %/test-hw-events.o
+%/test-hw-events.o: common/hw-events.c
+	$(AM_V_CC)$(COMPILE) -DMAIN -c -o $@ $<
+%/test-hw-events: %/test-hw-events.o %/libsim.a
+	$(AM_V_CCLD)$(LINK) -o $@ $^ $(SIM_COMMON_LIBS) $(LIBS)
+
 # FIXME This is one very simple-minded way of generating the file hw-config.h.
 %/hw-config.h: %/stamp-hw ; @true
 %/stamp-hw: Makefile

sim/common/Make-common.in

@@ -154,11 +154,6 @@ override COMPILE.pre = source='$<' object='$@' libtool=no \
 override POSTCOMPILE =
 endif
 
-test-hw-events: $(srccom)/hw-events.c libsim.a
-	$(ECHO_CCLD) $(LIBTOOL) $(AM_V_lt) --tag=CC --mode=link \
-		$(CC) $(ALL_CFLAGS) -DMAIN -o test-hw-events$(EXEEXT) \
-		$(srccom)/hw-events.c libsim.a $(EXTRA_LIBS)
-
 # Support targets.
 
 install:

sim/common/hw-events.c

@@ -23,6 +23,8 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 #include <stdarg.h>
 #include <string.h>
 
+#include "sim/callback.h"
+
 #include "hw-main.h"
 #include "hw-base.h"
 

sim/common/local.mk

@@ -52,6 +52,15 @@ noinst_LIBRARIES += %D%/libcommon.a
 CLEANFILES += \
 	%D%/version.c %D%/version.c-stamp
 
+## NB: This is a bit of a hack.  If we can generalize the common/ files, we can
+## turn this from an arch-specific %/test-hw-events into a common/test-hw-events
+## program.
+.PRECIOUS: %/test-hw-events.o
+%/test-hw-events.o: common/hw-events.c
+	$(AM_V_CC)$(COMPILE) -DMAIN -c -o $@ $<
+%/test-hw-events: %/test-hw-events.o %/libsim.a
+	$(AM_V_CCLD)$(LINK) -o $@ $^ $(SIM_COMMON_LIBS) $(LIBS)
+
 ##
 ## For subdirs.
 ##