[CI] Explicitly compute needed runtime targets

.ci/compute_projects.py

@@ -57,6 +57,13 @@
     ".ci": {"llvm", "clang", "lld", "lldb"},
 }
 
+# This mapping describes runtimes that should be enabled for a specific project,
+# but not necessarily run for testing. The only case of this currently is lldb
+# which needs some runtimes enabled for tests.
+DEPENDENT_RUNTIMES_TO_BUILD = {"lldb": {"libcxx", "libcxxabi", "libunwind"}}
+
+# This mapping describes runtimes that should be tested when the key project is
+# touched.
 DEPENDENT_RUNTIMES_TO_TEST = {"clang": {"libcxx", "libcxxabi", "libunwind"}}
 
 EXCLUDE_LINUX = {
@@ -180,16 +187,20 @@ def _compute_project_check_targets(projects_to_test: Set[str]) -> Set[str]:
 def _compute_runtimes_to_test(projects_to_test: Set[str]) -> Set[str]:
     runtimes_to_test = set()
     for project_to_test in projects_to_test:
-        if project_to_test not in DEPENDENT_RUNTIMES_TO_TEST:
-            continue
-        runtimes_to_test.update(DEPENDENT_RUNTIMES_TO_TEST[project_to_test])
+        if project_to_test in DEPENDENT_RUNTIMES_TO_TEST:
+            runtimes_to_test.update(DEPENDENT_RUNTIMES_TO_TEST[project_to_test])
+        if project_to_test in DEPENDENT_RUNTIMES_TO_BUILD:
+            runtimes_to_test.update(DEPENDENT_RUNTIMES_TO_BUILD[project_to_test])
     return runtimes_to_test
 
 
-def _compute_runtime_check_targets(runtimes_to_test: Set[str]) -> Set[str]:
+def _compute_runtime_check_targets(projects_to_test: Set[str]) -> Set[str]:
     check_targets = set()
-    for runtime_to_test in runtimes_to_test:
-        check_targets.add(PROJECT_CHECK_TARGETS[runtime_to_test])
+    for project_to_test in projects_to_test:
+        if project_to_test not in DEPENDENT_RUNTIMES_TO_TEST:
+            continue
+        for runtime_to_test in DEPENDENT_RUNTIMES_TO_TEST[project_to_test]:
+            check_targets.add(PROJECT_CHECK_TARGETS[runtime_to_test])
     return check_targets
 
 
@@ -216,16 +227,16 @@ def get_env_variables(modified_files: list[str], platform: str) -> Set[str]:
     projects_to_test = _compute_projects_to_test(modified_projects, platform)
     projects_to_build = _compute_projects_to_build(projects_to_test)
     projects_check_targets = _compute_project_check_targets(projects_to_test)
-    runtimes_to_test = _compute_runtimes_to_test(projects_to_test)
-    runtimes_check_targets = _compute_runtime_check_targets(runtimes_to_test)
+    runtimes_to_build = _compute_runtimes_to_test(projects_to_test)
+    runtimes_check_targets = _compute_runtime_check_targets(projects_to_test)
     # We use a semicolon to separate the projects/runtimes as they get passed
     # to the CMake invocation and thus we need to use the CMake list separator
     # (;). We use spaces to separate the check targets as they end up getting
     # passed to ninja.
     return {
         "projects_to_build": ";".join(sorted(projects_to_build)),
         "project_check_targets": " ".join(sorted(projects_check_targets)),
-        "runtimes_to_build": ";".join(sorted(runtimes_to_test)),
+        "runtimes_to_build": ";".join(sorted(runtimes_to_build)),
         "runtimes_check_targets": " ".join(sorted(runtimes_check_targets)),
     }
 

.ci/compute_projects_test.py

@@ -205,6 +205,17 @@ def test_ci(self):
             "check-cxx check-cxxabi check-unwind",
         )
 
+    def test_lldb(self):
+        env_variables = compute_projects.get_env_variables(
+            ["lldb/CMakeLists.txt"], "Linux"
+        )
+        self.assertEqual(env_variables["projects_to_build"], "clang;lldb;llvm")
+        self.assertEqual(env_variables["project_check_targets"], "check-lldb")
+        self.assertEqual(
+            env_variables["runtimes_to_build"], "libcxx;libcxxabi;libunwind"
+        )
+        self.assertEqual(env_variables["runtimes_check_targets"], "")
+
 
 if __name__ == "__main__":
     unittest.main()

.ci/monolithic-linux.sh

@@ -55,6 +55,8 @@ trap at-exit EXIT
 
 projects="${1}"
 targets="${2}"
+runtimes="${3}"
+runtime_targets="${4}"
 
 lit_args="-v --xunit-xml-output ${BUILD_DIR}/test-results.xml --use-unique-output-file-name --timeout=1200 --time-tests"
 
@@ -70,7 +72,7 @@ export LLVM_SYMBOLIZER_PATH=`which llvm-symbolizer`
 # It will not be built unless it is used.
 cmake -S "${MONOREPO_ROOT}"/llvm -B "${BUILD_DIR}" \
       -D LLVM_ENABLE_PROJECTS="${projects}" \
-      -D LLVM_ENABLE_RUNTIMES="libcxx;libcxxabi;libunwind" \
+      -D LLVM_ENABLE_RUNTIMES="${runtimes}" \
       -G Ninja \
       -D CMAKE_PREFIX_PATH="${HOME}/.local" \
       -D CMAKE_BUILD_TYPE=Release \
@@ -91,17 +93,9 @@ echo "--- ninja"
 # Targets are not escaped as they are passed as separate arguments.
 ninja -C "${BUILD_DIR}" -k 0 ${targets}
 
-runtimes="${3}"
-runtime_targets="${4}"
-
 # Compiling runtimes with just-built Clang and running their tests
 # as an additional testing for Clang.
-if [[ "${runtimes}" != "" ]]; then
-  if [[ "${runtime_targets}" == "" ]]; then
-    echo "Runtimes to build are specified, but targets are not."
-    exit 1
-  fi
-
+if [[ "${runtimes_targets}" != "" ]]; then
   echo "--- cmake runtimes C++26"
 
   cmake \