ninja backend: generate additional meta-rules for test/benchmarks targets

'meson-test-prereq' now depends on any targets that were formerly added
directly to 'all'. Behavior is not changed -- the all target still
depends on this other meta-rule, and thus indirectly depends on all
targets it used to depend on.

It is now possible to build just the targets needed for the testsuite
and then e.g. run `meson test --no-rebuild`.

1 files changed, 7 insertions, 4 deletions

diff --git a/mesonbuild/backend/backends.py b/mesonbuild/backend/backends.py
index 53fd6da..8524bf9 100644
--- a/mesonbuild/backend/backends.py
+++ b/mesonbuild/backend/backends.py
@@ -11,6 +11,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+from __future__ import annotations
 
 from collections import OrderedDict
 from dataclasses import dataclass, InitVar
@@ -1244,10 +1245,12 @@ class Backend:
         for name, b in self.build.get_targets().items():
             if b.build_by_default:
                 result[name] = b
-        # Get all targets used as test executables and arguments. These must
-        # also be built by default. XXX: Sometime in the future these should be
-        # built only before running tests.
-        for t in self.build.get_tests():
+        return result
+
+    def get_testlike_targets(self, benchmark: bool = False) -> T.OrderedDict[str, T.Union[build.BuildTarget, build.CustomTarget]]:
+        result: T.OrderedDict[str, T.Union[build.BuildTarget, build.CustomTarget]] = OrderedDict()
+        targets = self.build.get_benchmarks() if benchmark else self.build.get_tests()
+        for t in targets:
             exe = t.exe
             if isinstance(exe, (build.CustomTarget, build.BuildTarget)):
                 result[exe.get_id()] = exe