build-sys: Add support for --enable-test-coverage to configure

Add support for --enable-test-coverage that sets additional CFLAGS
and LDFLAGS.

gcov creates files with suffixes .gcov, .gcno, and .gcda that we
need clean up in a few directories.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>

configure.ac

@@ -162,6 +162,10 @@ AC_ARG_ENABLE([fuzzer], AS_HELP_STRING([--enable-fuzzer], [Enable fuzzer]),
 AC_SUBST([SANITIZERS])
 AC_SUBST([FUZZER])
 
+AC_ARG_ENABLE([test-coverage],
+  AS_HELP_STRING([--enable-test-coverage], [Enable test coverage flags]),
+  [COVERAGE_CFLAGS="-fprofile-arcs -ftest-coverage" COVERAGE_LDFLAGS="-fprofile-arcs"])
+
 LT_INIT
 AC_PROG_CC
 AC_PROG_INSTALL
@@ -209,7 +213,8 @@ if test "x$enable_hardening" != "xno"; then
 fi
 
 if test "$test_CFLAGS" != set; then
-  CFLAGS="$CFLAGS -Wall -Werror -Wreturn-type -Wsign-compare -Wno-self-assign"
+  CFLAGS="$CFLAGS $COVERAGE_CFLAGS -Wall -Werror -Wreturn-type -Wsign-compare -Wno-self-assign"
+  LDFLAGS="$LDFLAGS $COVERAGE_LDFLAGS"
 fi
 
 AC_CONFIG_FILES(Makefile                   \

src/Makefile.am

@@ -598,4 +598,17 @@ EXTRA_DIST = \
 	libtpms.syms \
 	test.syms
 
-CLEANFILES = a.out
+CLEANFILES = \
+	a.out \
+	*.gcov \
+	*.gcda \
+	*.gcno \
+	tpm12/*.gcov \
+	tpm12/*.gcda \
+	tpm12/*.gcno \
+	tpm2/*.gcov \
+	tpm2/*.gcda \
+	tpm2/*.gcno \
+	tpm2/crypto/openssl/*.gcov \
+	tpm2/crypto/openssl/*.gcda \
+	tpm2/crypto/openssl/*.gcno

tests/Makefile.am

@@ -56,3 +56,8 @@ EXTRA_DIST = \
 	common \
 	tpm2_pcr_read.c \
 	tpm2_pcr_read.sh
+
+CLEANFILES = \
+	*.gcov \
+	*.gcda \
+	*.gcno