[v2] tests: add gcov target

diff --git a/Makefile.objs b/Makefile.objs
index 3a3a402..a3eab4b 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -31,6 +31,8 @@  oslib-obj-$(CONFIG_POSIX) += oslib-posix.o qemu-thread-posix.o
 # coroutines
 coroutine-obj-y = qemu-coroutine.o qemu-coroutine-lock.o qemu-coroutine-io.o
 coroutine-obj-y += qemu-coroutine-sleep.o
+
+# If you change this logic, please also check tests/Makefile
 ifeq ($(CONFIG_UCONTEXT_COROUTINE),y)
 coroutine-obj-$(CONFIG_POSIX) += coroutine-ucontext.o
 else
diff --git a/configure b/configure
index 99c1ec3..ed801ad 100755
--- a/configure
+++ b/configure
@@ -176,6 +176,8 @@  strip_opt="yes"
 tcg_interpreter="no"
 bigendian="no"
 mingw32="no"
+gcov="no"
+gcov_tool="gcov"
 EXESUF=""
 prefix="/usr/local"
 mandir="\${prefix}/share/man"
@@ -599,6 +601,8 @@  for opt do
   ;;
   --python=*) python="$optarg"
   ;;
+  --gcov=*) gcov_tool="$optarg"
+  ;;
   --smbd=*) smbd="$optarg"
   ;;
   --extra-cflags=*)
@@ -619,6 +623,8 @@  for opt do
   ;;
   --enable-gprof) gprof="yes"
   ;;
+  --enable-gcov) gcov="yes"
+  ;;
   --static)
     static="yes"
     LDFLAGS="-static $LDFLAGS"
@@ -1130,6 +1136,8 @@  echo "  --with-coroutine=BACKEND coroutine backend. Supported options:"
 echo "                           gthread, ucontext, sigaltstack, windows"
 echo "  --enable-glusterfs       enable GlusterFS backend"
 echo "  --disable-glusterfs      disable GlusterFS backend"
+echo "  --enable-gcov            enable test coverage analysis with gcov"
+echo "  --gcov=GCOV              use specified gcov [$gcov_tool]"
 echo ""
 echo "NOTE: The object files are built at the place where configure is launched"
 exit 1
@@ -3090,10 +3098,14 @@  fi
 # End of CC checks
 # After here, no more $cc or $ld runs
 
-if test "$debug" = "no" ; then
+if test "$gcov" = "yes" ; then
+  CFLAGS="-fprofile-arcs -ftest-coverage -g $CFLAGS"
+  LDFLAGS="-fprofile-arcs -ftest-coverage $LDFLAGS"
+elif test "$debug" = "no" ; then
   CFLAGS="-O2 -D_FORTIFY_SOURCE=2 $CFLAGS"
 fi
 
+
 # Disable zero malloc errors for official releases unless explicitly told to
 # enable/disable
 if test -z "$zero_malloc" ; then
@@ -3274,6 +3286,8 @@  echo "build guest agent $guest_agent"
 echo "seccomp support   $seccomp"
 echo "coroutine backend $coroutine_backend"
 echo "GlusterFS support $glusterfs"
+echo "gcov              $gcov_tool"
+echo "gcov enabled      $gcov"
 
 if test "$sdl_too_old" = "yes"; then
 echo "-> Your SDL version is too old - please upgrade to have SDL support"
@@ -3697,6 +3711,9 @@  echo "EXESUF=$EXESUF" >> $config_host_mak
 echo "LIBS_QGA+=$libs_qga" >> $config_host_mak
 echo "POD2MAN=$POD2MAN" >> $config_host_mak
 echo "TRANSLATE_OPT_CFLAGS=$TRANSLATE_OPT_CFLAGS" >> $config_host_mak
+if test "$gcov" = "yes" ; then
+  echo "GCOV=$gcov_tool" >> $config_host_mak
+fi
 
 # generate list of library paths for linker script
 
diff --git a/tests/Makefile b/tests/Makefile
index b60f0fb..d5386e0 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -1,33 +1,65 @@ 
 export SRC_PATH
 
 check-unit-y = tests/check-qdict$(EXESUF)
+GCOV_FILES-y = qdict.c
 check-unit-y += tests/check-qfloat$(EXESUF)
+GCOV_FILES-y += qfloat.c
 check-unit-y += tests/check-qint$(EXESUF)
+GCOV_FILES-y += qint.c
 check-unit-y += tests/check-qstring$(EXESUF)
+GCOV_FILES-y += qstring.c
 check-unit-y += tests/check-qlist$(EXESUF)
+GCOV_FILES-y += qlist.c
 check-unit-y += tests/check-qjson$(EXESUF)
+GCOV_FILES-y += qjson.c
 check-unit-y += tests/test-qmp-output-visitor$(EXESUF)
+GCOV_FILES-y += qapi/qmp-output-visitor.c
 check-unit-y += tests/test-qmp-input-visitor$(EXESUF)
+GCOV_FILES-y += qapi/qmp-input-visitor.c
 check-unit-y += tests/test-qmp-input-strict$(EXESUF)
 check-unit-y += tests/test-qmp-commands$(EXESUF)
+GCOV_FILES-y += qapi/qmp-dispatch.c
 check-unit-y += tests/test-string-input-visitor$(EXESUF)
+GCOV_FILES-y += qapi/string-input-visitor.c
 check-unit-y += tests/test-string-output-visitor$(EXESUF)
+GCOV_FILES-y += qapi/string-output-visitor.c
 check-unit-y += tests/test-coroutine$(EXESUF)
 check-unit-y += tests/test-visitor-serialization$(EXESUF)
+ifeq ($(CONFIG_WIN32),y)
+GCOV_FILES-y += coroutine-win32.c
+else
+ifeq ($(CONFIG_UCONTEXT_COROUTINE),y)
+GCOV_FILES-y += coroutine-ucontext.c
+else
+ifeq ($(CONFIG_SIGALTSTACK_COROUTINE),y)
+GCOV_FILES-y += coroutine-sigaltstack.c
+else
+GCOV_FILES-y += coroutine-gthread.c
+endif
+endif
+endif
 check-unit-y += tests/test-iov$(EXESUF)
+GCOV_FILES-y += iov.c
 check-unit-y += tests/test-aio$(EXESUF)
+GCOV_FILES-$(CONFIG_WIN32) += aio-win32.c
+GCOV_FILES-$(CONFIG_POSIX) += aio-posix.c
 check-unit-y += tests/test-thread-pool$(EXESUF)
+GCOV_FILES-y += thread-pool.c
 
 check-block-$(CONFIG_POSIX) += tests/qemu-iotests-quick.sh
 
 # All QTests for now are POSIX-only, but the dependencies are
 # really in libqtest, not in the testcases themselves.
 check-qtest-i386-y = tests/fdc-test$(EXESUF)
+GCOV_FILES-y += hw/fdc.c
 check-qtest-i386-y += tests/hd-geo-test$(EXESUF)
+GCOV_FILES-y += hw/hd-geometry.c
 check-qtest-i386-y += tests/rtc-test$(EXESUF)
 check-qtest-x86_64-y = $(check-qtest-i386-y)
+GCOV_FILES-y += i386-softmmu/hw/mc146818rtc.c
 check-qtest-sparc-y = tests/m48t59-test$(EXESUF)
 check-qtest-sparc64-y = tests/m48t59-test$(EXESUF)
+GCOV_FILES-y += hw/m48t59.c
 
 GENERATED_HEADERS += tests/test-qapi-types.h tests/test-qapi-visit.h tests/test-qmp-commands.h
 
@@ -98,6 +130,8 @@  check-help:
 	@echo " make check-unit           Run qobject tests"
 	@echo " make check-block          Run block tests"
 	@echo " make check-report.html    Generates an HTML test report"
+	@echo " make gcov                 Report test coverage"
+	@echo " make gcov-zerocounters    Zero test coverage counters"
 	@echo
 	@echo "Please note that HTML reports do not regenerate if the unit tests"
 	@echo "has not changed."
@@ -105,6 +139,8 @@  check-help:
 	@echo "The variable SPEED can be set to control the gtester speed setting."
 	@echo "Default options are -k and (for make V=1) --verbose; they can be"
 	@echo "changed with variable GTESTER_OPTIONS."
+	@echo
+	@echo "For test coverage, please run 'make gcov-zerocounters check gcov'."
 
 SPEED = quick
 GTESTER_OPTIONS = -k $(if $(V),--verbose,-q)
@@ -137,6 +173,16 @@  check-report.xml: $(patsubst %,check-report-qtest-%.xml, $(QTEST_TARGETS)) check
 check-report.html: check-report.xml
 	$(call quiet-command,gtester-report $< > $@, "  GEN    $@")
 
+# Gcov test coverage
+GCOV_OPTIONS = -n $(if $(V),-f,)
+.PHONY: gcov gcov-zerocounters
+gcov:
+	@for f in $(GCOV_FILES-y); do \
+	  $(GCOV) $(GCOV_OPTIONS) $$f -o `dirname $$f`; \
+	done
+
+gcov-zerocounters:
+	rm -f *.gcda */*.gcda */*/*.gcda */*/*/*.gcda
 
 # Other tests