CI: implement universal check for compiler warnings

.gitlab-ci.yml

@@ -65,7 +65,7 @@ check_style:
       --fortran .f90
     - git -C ${CI_PROJECT_DIR} diff --patch-with-raw > ${STYLE_PATCH}
     - |
-      # Test if patching is necessary:
+      # Test if patching is necessary
       test ! -s ${STYLE_PATCH} || {
         printf "${RED}The source code does not meet the style recuirements. \
       Please, apply the patch (see artifacts).${DEFAULT}\n"
@@ -115,6 +115,8 @@ include:
     LIBCHECK_SHA256: a8de4e0bacfb4d76dd1c618ded263523b53b85d92a146d8835eb1a52932fa20a
     MAKEFLAGS: --jobs=8 V=1
     AM_COLOR_TESTS: always
+    WARNINGS_AWK_SCRIPT: '/warning/ || /WARNING/ || /Warning/'
+    WARNINGS_FILE: ${CI_PROJECT_DIR}/make.warnings
   before_script:
     - module purge
     - module load gcc/11.2.0-gcc-11.2.0
@@ -138,29 +140,31 @@ include:
   script:
     - mkdir build && cd build
     - ../configure --with-check-root="${LIBCHEK_ROOT}" ${CONFIG_EXTRA_ARGS}
-    - make
-    - make check
+    - make --output-sync=target check AM_COLOR_TESTS=no TESTS= 2> >(tee ${WARNINGS_FILE})
+    - make --silent --keep-going check
+    - awk "${WARNINGS_AWK_SCRIPT}" ${WARNINGS_FILE} > awk.out
+    - |
+      # Check if there are compiler warnings
+      test ! -s awk.out || {
+        printf "${RED}The compiler issued warnings (see artifacts).${DEFAULT}\n"
+        exit 1
+      }
   interruptible: true
+  artifacts:
+    when: on_failure
+    paths:
+      - ${WARNINGS_FILE}
   cache:
     policy: pull
     key: ${LIBCHECK_SHA256}
     paths:
       - ${LIBCHEK_ROOT}
 
-gcc11_pedantic:
-  extends: .common
-  script:
-    # The examples are too broken:
-    - ./configure --disable-examples ${CONFIG_EXTRA_ARGS}
-    # The configuration fails with all warnings enabled and -Werror. Therefore,
-    # we extend the flags at the build time:
-    - >-
-      make
-      CFLAGS="$(echo '@CFLAGS@' | ./config.status --file=-) -Wall -Wextra -pedantic -Werror"
-      FCFLAGS="$(echo '@FCFLAGS@' | ./config.status -q --file=-) -Wall -Wextra -pedantic -Werror"
-
 gcc11:
   extends: .common
+  variables:
+    CFLAGS: -g -O2 -Wall -Wextra -pedantic
+    FCFLAGS: -g -O2 -Wall -Wextra -pedantic
   cache:
     policy: pull-push
 
@@ -187,6 +191,8 @@ nag:
   extends: .common
   variables:
     FC: nagfor
+    # Ignore Questionable warnings:
+    WARNINGS_AWK_SCRIPT: '!/^\[NAG Fortran Compiler normal termination/ && (/warning/ || /WARNING/ || /Warning/)'
   before_script:
     - !reference [.common, before_script]
     - module load nag/7.1-gcc-11.2.0