build: Add code coverage support in the GitLab CI

.gitignore

@@ -7,6 +7,8 @@ ChangeLog
 *.a
 *.log
 *.trs
+*.gcda
+*.gcno
 .dirstamp
 .deps/
 .libs/

.gitlab-ci.yml

@@ -1,10 +1,19 @@
 image: debian:buster
 
-test:
-  before_script:
+before_script:
   - apt-get update -qq
   - apt-get install -qq -y --no-install-recommends
-              git gcc make autoconf automake libtool libmd-dev
+            git gcc make autoconf automake libtool libmd-dev gcovr
+
+unit-tests:
+  stage: test
   script:
     - ./autogen && ./configure
     - make check
+
+coverage:
+  stage: test
+  script:
+    - ./autogen && ./configure --disable-static
+    - make check CFLAGS="--coverage -O0 -ggdb" LDFLAGS="--coverage -O0 -ggdb"
+    - gcovr -s -e test/