Integrate initial make coverage target

This was essentially "borrowed" from Buxton

Signed-off-by: Ikey Doherty <michael.i.doherty@intel.com>

.gitignore

@@ -25,4 +25,9 @@ check_*.trs
 test-*.log
 .dirstamp
 check_jira_plugin
-check_packaging
+check_packaging
+
+coverage/
+
+*.gcno
+*.gcda

Makefile.am

@@ -1,3 +1,5 @@
+include $(top_srcdir)/common.mk
+
 ACLOCAL_AMFLAGS = -I m4
 
 EXTRA_DIST = ${top_srcdir}/README.md \
@@ -14,3 +16,11 @@ SUBDIRS = \
 	src \
 	tests \
 	docs
+
+if COVERAGE
+coverage:
+	mkdir -p coverage
+	lcov --compat-libtool --directory . --capture --output-file coverage/report
+	genhtml -o coverage/ coverage/report
+AM_CFLAGS += --coverage
+endif

configure.ac

@@ -23,6 +23,25 @@ PKG_CHECK_MODULES([CHECK], [check >= 0.9])
 
 AC_CONFIG_MACRO_DIR([m4])
 
+have_coverage=no
+AC_ARG_ENABLE(coverage, AS_HELP_STRING([--enable-coverage], [enable test coverage]))
+if test "x$enable_coverage" = "xyes" ; then
+        AC_CHECK_PROG(lcov_found, [lcov], [yes], [no])
+        if test "x$lcov_found" = xno ; then
+                AC_MSG_ERROR([*** lcov support requested but the program was not found])
+        else
+                lcov_version_major="`lcov --version | cut -d ' ' -f 4 | cut -d '.' -f 1`"
+                lcov_version_minor="`lcov --version | cut -d ' ' -f 4 | cut -d '.' -f 2`"
+                if test "$lcov_version_major" -eq 1 -a "$lcov_version_minor" -lt 10; then
+                        AC_MSG_ERROR([*** lcov version is too old. 1.10 required])
+                else
+			have_coverage=yes
+			AC_DEFINE([COVERAGE], [1], [Coverage enabled])
+                fi
+        fi
+fi
+AM_CONDITIONAL([COVERAGE], [test "$have_coverage" = "yes"])
+
 
 AC_CONFIG_FILES([Makefile
                  data/Makefile
@@ -43,6 +62,8 @@ AC_MSG_RESULT([
         bindir:                 ${bindir}
         datarootdir:            ${datarootdir}
 
+        coverage:               ${have_coverage}
+
         compiler:               ${CC}
         cflags:                 ${CFLAGS}
         ldflags:                ${LDFLAGS}

src/Makefile.am

@@ -1,4 +1,8 @@
--include $(top_srcdir)/common.mk
+include $(top_srcdir)/common.mk
+
+if COVERAGE
+AM_CFLAGS += --coverage
+endif
 
 bin_PROGRAMS = cve-check-tool
 

tests/Makefile.am

@@ -1,5 +1,8 @@
--include $(top_srcdir)/common.mk
+include $(top_srcdir)/common.mk
 
+if COVERAGE
+AM_CFLAGS += --coverage
+endif
 
 TESTS = \
 	check_core \