gitlab-ci: add a series of jobs to perform coverage

.gitlab-ci.yml

@@ -40,6 +40,7 @@ variables:
 ################################################################################
 
 # Job prefixes:
+#   - `a:` analysis
 #   - `b:` build
 #   - `k:` package
 #   - `l:` lint
@@ -147,6 +148,44 @@ l:clazy-fedora42:
         - .linux_x86_64_tags
         - .run_automatically
 
+# Coverage builds
+
+b:fedora42-gcc-gcov:
+    extends:
+        - .fedora42_gcc_gcov
+        - .cmake_build_linux
+        - .cmake_build_artifacts
+        - .linux_x86_64_tags
+        - .run_manually
+    variables:
+        CMAKE_CI_JOB_NIGHTLY: "true"
+
+t:fedora42-gcc-gcov:
+    extends:
+        - .fedora42_gcc_gcov
+        - .cmake_test_linux
+        - .cmake_coverage_artifacts
+        - .linux_x86_64_tags_x11
+        - .run_dependent
+    # Run coverage analysis even if the tests fail.
+    allow_failure: true
+    needs:
+        - b:fedora42-gcc-gcov
+    variables:
+        CMAKE_CI_JOB_NIGHTLY: "true"
+
+a:fedora42-gcc-gcov:
+    extends:
+        - .fedora42_gcc_gcov
+        - .cmake_coverage_linux
+        - .cmake_cdash_artifacts
+        - .linux_x86_64_tags
+        - .run_dependent
+    needs:
+        - t:fedora42-gcc-gcov
+    variables:
+        CMAKE_CI_JOB_NIGHTLY: "true"
+
 # Linux builds
 
 b:centos7-x86_64:

.gitlab/ci/configure_fedora42_gcc_gcov.cmake

@@ -0,0 +1,46 @@
+set(CMake_TEST_GUI "ON" CACHE BOOL "")
+set(CMake_TEST_MODULE_COMPILATION "named,compile_commands,collation,partitions,internal_partitions,export_bmi,install_bmi,shared,bmionly,build_database" CACHE STRING "")
+set(CMake_TEST_TLS_VERIFY_URL "https://gitlab.kitware.com" CACHE STRING "")
+set(CMake_TEST_TLS_VERIFY_URL_BAD "https://badtls-expired.kitware.com" CACHE STRING "")
+set(CMake_TEST_TLS_VERSION "1.3" CACHE STRING "")
+set(CMake_TEST_TLS_VERSION_URL_BAD "https://badtls-v1-1.kitware.com:8011" CACHE STRING "")
+
+string(CONCAT coverage_flags
+  "--coverage "
+  "-fprofile-abs-path "
+  # These files are committed generated sources and contain relative path
+  # `#line` directives. CI coverage then cannot find the source files reliably.
+  # See related issue #20001.
+  "-fprofile-exclude-files=cmExprParser[.].*\\;cmFortranParser[.].* "
+  "-fdiagnostics-show-option "
+  "-Wall "
+  "-Wextra "
+  "-Wshadow "
+  "-Wpointer-arith "
+  "-Winvalid-pch "
+  "-Wcast-align "
+  "-Wdisabled-optimization "
+  "-Wwrite-strings "
+  "-fstack-protector-all "
+  "-Wconversion "
+  "-Wno-error=sign-conversion "
+  "-Wno-error=conversion ")
+string(CONCAT link_flags
+  "--coverage ")
+
+set(CMAKE_C_FLAGS "${coverage_flags}" CACHE STRING "")
+set(CMAKE_CXX_FLAGS "${coverage_flags} -Woverloaded-virtual -Wstrict-null-sentinel" CACHE STRING "")
+# Apply `LDFLAGS`.
+set(CMAKE_EXE_LINKER_FLAGS_INIT "${link_flags}" CACHE STRING "")
+set(CMAKE_SHARED_LINKER_FLAGS_INIT "${link_flags}" CACHE STRING "")
+set(CMAKE_MODULE_LINKER_FLAGS_INIT "${link_flags}" CACHE STRING "")
+
+# Do not bootstrap for the coverage test suite.
+set(CMAKE_SKIP_BOOTSTRAP_TEST TRUE CACHE BOOL "")
+
+# Cover compilation with C++11 only and not higher standards.
+set(CMAKE_CXX_STANDARD "11" CACHE STRING "")
+# Qt 6 requires C++17, so use Qt 5.
+set(CMake_QT_MAJOR_VERSION "5" CACHE STRING "")
+
+include("${CMAKE_CURRENT_LIST_DIR}/configure_fedora42_common.cmake")

.gitlab/os-linux.yml

@@ -97,6 +97,20 @@
         GIT_CLONE_PATH: "$CI_BUILDS_DIR/cmake-ci"
         CMAKE_ARCH: x86_64
 
+#### Coverage builds
+
+.fedora42_gcc_gcov:
+    extends: .fedora42
+
+    variables:
+        # See issue #20001
+        CMAKE_GENERATOR: "Unix Makefiles"
+        CMAKE_CONFIGURATION: fedora42_gcc_gcov
+        CTEST_NO_WARNINGS_ALLOWED: 1
+        CMAKE_CI_BUILD_TYPE: Debug
+        CMAKE_CI_TEST_TIMEOUT: "1500"
+        CMAKE_CI_NO_INSTALL: 1
+
 #### Lint builds
 
 .fedora42_tidy: