From 1daa2632fbabf0afc2f406218f55d9331c4ccbf3 Mon Sep 17 00:00:00 2001
From: Vlasta Vesely <vlastavesely@protonmail.ch>
Date: Thu, 25 Feb 2021 09:48:38 +0100
Subject: [PATCH] allow to generate code coverage

---
 .gitignore   |  3 +++
 Makefile.in  | 21 ++++++++++++++++-----
 configure.ac | 24 ++++++++++++++++++++++++
 3 files changed, 43 insertions(+), 5 deletions(-)

diff --git a/.gitignore b/.gitignore
index 4e16b85..7ea8681 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,7 +2,10 @@
 *.d
 /iast
 /tests/test
+/tests/coverage
 *.1.gz
+*.gcno
+*.gcda
 
 /Makefile
 /configure
diff --git a/Makefile.in b/Makefile.in
index 6c3fb33..02e165b 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -12,11 +12,13 @@ bindir      = @bindir@
 datarootdir = @datarootdir@
 mandir      = @mandir@
 
-CFLAGS = -Wall @CFLAGS@
+USE_GCOV = @USE_GCOV@
+
+CFLAGS = -Wall @CFLAGS@ @COVERAGE_CFLAGS@
 LFLAGS =
 
 TEST_CFLAGS = @CFLAGS@ @CHECK_CFLAGS@
-TEST_LFLAGS = @CHECK_LIBS@
+TEST_LFLAGS = @CHECK_LIBS@ @COVERAGE_LFLAGS@
 
 OBJECTS = iast.o iast-czech.o transliteration.o transcription.o utf8.o velthuis.o
 TEST_OBJECTS = tests/main.o tests/translit.o tests/transcript.o tests/velthuis.o
@@ -31,7 +33,7 @@ include $(wildcard *.d tests/*.d)
 $(PROGNAME): main.o $(OBJECTS)
 	$(QUIET_LD) $(CC) $^ -o $@ $(LFLAGS)
 
-test: all
+test: tests/test
 	tests/test
 
 %.o: %.c
@@ -41,7 +43,7 @@ tests/%.o: tests/%.c
 	$(QUIET_CC) $(CC) -MMD -MP -c $< -o $@ $(TEST_CFLAGS)
 
 tests/test: $(OBJECTS) $(TEST_OBJECTS)
-	$(QUIET_LD) $(CC) $^ -o $@ $(TEST_CFLAGS) $(TEST_LFLAGS)
+	$(QUIET_LD) $(CC) $^ -o $@ $(TEST_LFLAGS)
 
 %.1.gz: %.1
 	$(QUIET_GEN) cat $< | gzip -f >$@
@@ -57,13 +59,22 @@ uninstall:
 
 clean:
 	$(RM) $(PROGNAME) tests/test $(PROGNAME).1.gz
-	$(RM) *.o */*.o */*.d *.d
+	$(RM) -r *.o */*.o */*.d *.d *.gcda *.gcno tests/coverage
 
 clean-aux:
 	$(RM) -r $(AUX_FILES)
 
 distclean: clean clean-aux
 
+ifeq ($(USE_GCOV),yes)
+coverage:
+	$(MAKE) test
+	$(MKDIR_P) tests/coverage
+	lcov --no-external -c -d $(shell pwd) -o tests/coverage/coverage.info
+	genhtml -o tests/coverage -t "IAST Test Coverage" \
+		tests/coverage/coverage.info
+endif
+
 
 ifndef V
 QUIET_CC    = @echo "  CC     $@";
diff --git a/configure.ac b/configure.ac
index 86653ec..0fb5bc4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -29,5 +29,29 @@ AC_FUNC_MALLOC
 AC_FUNC_REALLOC
 AC_CHECK_FUNCS([memmove])
 
+# Enable for gcov if option --enable-gcov is present.
+USE_GCOV=no
+AC_MSG_CHECKING([whether gcov should be enabled])
+AC_ARG_ENABLE(gcov,
+	AS_HELP_STRING([--enable-gcov], [enable gcov code coverage analysis]), [
+	if test "x$enableval" != "xno" ; then
+		if test "$GCC" != "yes"; then
+			AC_MSG_ERROR([gcc is required for --enable-gcov])
+		fi
+		AC_MSG_RESULT(yes)
+		COVERAGE_CFLAGS="-O0 -g -fno-inline -fprofile-arcs -ftest-coverage"
+		COVERAGE_LFLAGS="-fprofile-arcs -lgcov"
+		USE_GCOV=yes
+	else
+		AC_MSG_RESULT(no)
+		COVERAGE_CFLAGS=""
+		COVERAGE_LFLAGS=""
+		USE_GCOV=no
+	fi
+], [AC_MSG_RESULT(no)])
+AC_SUBST(COVERAGE_CFLAGS)
+AC_SUBST(COVERAGE_LFLAGS)
+AC_SUBST(USE_GCOV)
+
 AC_CONFIG_FILES([Makefile])
 AC_OUTPUT