build: enable code coverage

Enable code coverage for the project.  Valgrind not enabled in this
step.

Change-Id: I62891f6054e5e5315d7f150a1f3dcf619f2740db
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/Makefile.am b/Makefile.am
index 3a1b52b..8abec1f 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,12 +1,43 @@
 AM_DEFAULT_SOURCE_EXT = .cpp
 
+# Ignore system headers
+CODE_COVERAGE_IGNORE_PATTERN = '/include/*' '/usr/include/*' '$(includedir)/*'
+export CODE_COVERAGE_IGNORE_PATTERN
+
+CODE_COVERAGE_LCOV_SHOPTS = $(CODE_COVERAGE_LCOV_SHOPTS_DEFAULT)
+# Use our configuration file for lcov
+CODE_COVERAGE_LCOV_SHOPTS += --config-file $(abs_srcdir)/.lcovrc
+export CODE_COVERAGE_LCOV_SHOPTS
+
+CODE_COVERAGE_LCOV_OPTIONS = $(CODE_COVERAGE_LCOV_OPTIONS_DEFAULT)
+# Use our configuration file for lcov
+CODE_COVERAGE_LCOV_OPTIONS += --config-file $(abs_srcdir)/.lcovrc
+export CODE_COVERAGE_LCOV_OPTIONS
+
+CODE_COVERAGE_LCOV_RMOPTS = $(CODE_COVERAGE_LCOV_RMOPTS_DEFAULT)
+# Use our configuration file for lcov
+CODE_COVERAGE_LCOV_RMOPTS += --config-file $(abs_srcdir)/.lcovrc
+export CODE_COVERAGE_LCOV_RMOPTS
+
+CODE_COVERAGE_GENHTML_OPTIONS = $(CODE_COVERAGE_GENHTML_OPTIONS_DEFAULT)
+# Use our configuration file for genhtml
+CODE_COVERAGE_GENHTML_OPTIONS += --config-file $(abs_srcdir)/.lcovrc
+# Don't generate the absolute path for each file in the HTML output
+CODE_COVERAGE_GENHTML_OPTIONS += --prefix $(abs_srcdir) --prefix $(abs_builddir)
+export CODE_COVERAGE_GENHTML_OPTIONS
+
+AM_CPPFLAGS = $(CODE_COVERAGE_CPPFLAGS)
+AM_CFLAGS = $(CODE_COVERAGE_CFLAGS)
+AM_CXXFLAGS = $(CODE_COVERAGE_CXXFLAGS)
+
 sbin_PROGRAMS = swampd setsensor
 
 setsensor_SOURCES = setsensor.cpp
 setsensor_LDADD = \
 	$(SDBUSPLUS_LIBS) \
 	$(PHOSPHOR_DBUS_INTERFACES_LIBS) \
-	$(PHOSPHOR_LOGGING_LIBS)
+	$(PHOSPHOR_LOGGING_LIBS) \
+	$(CODE_COVERAGE_LIBS)
 setsensor_CXXFLAGS = \
 	$(SDBUSPLUS_CFLAGS) \
 	$(PHOSPHOR_DBUS_INTERFACES_CFLAGS) \
@@ -27,7 +58,8 @@
 	-lstdc++fs \
 	$(SDBUSPLUS_LIBS) \
 	$(PHOSPHOR_DBUS_INTERFACES_LIBS) \
-	$(PHOSPHOR_LOGGING_LIBS)
+	$(PHOSPHOR_LOGGING_LIBS) \
+	$(CODE_COVERAGE_LIBS)
 libswampd_la_CXXFLAGS = \
 	$(SDBUSPLUS_CFLAGS) \
 	$(PHOSPHOR_DBUS_INTERFACES_CFLAGS) \
@@ -78,6 +110,7 @@
 	$(PHOSPHOR_DBUS_INTERFACES_LIBS) \
 	$(PHOSPHOR_LOGGING_LIBS) \
 	$(LIBIPMID_LIBS) \
+	$(CODE_COVERAGE_LIBS) \
 	-version-info 0:0:0 -shared
 libmanualcmds_la_CXXFLAGS = \
 	$(SYSTEMD_CFLAGS) \