mtest: only build what is needed for the tests

It is a usual workflow to fix something and retest to see if it is fixed using a
particular test.  When tests start to become numerous, it becomes time consuming
for "meson test" to relink all of them (and in fact rebuild the whole project)
where the user has already specified the tests they want to run, as well as
the tests' dependencies.

Teach meson to be smart and only build what is needed for the test (or suite)
that were specified.

Fixes: #7473
Related: #7830

1 files changed, 17 insertions, 1 deletions

diff --git a/mesonbuild/minstall.py b/mesonbuild/minstall.py
index 47bb88b..a8ec8f3 100644
--- a/mesonbuild/minstall.py
+++ b/mesonbuild/minstall.py
@@ -19,7 +19,6 @@ from glob import glob
 from .scripts import depfixer
 from .scripts import destdir_join
 from .mesonlib import is_windows, Popen_safe
-from .mtest import rebuild_all
 from .backend.backends import InstallData
 from .coredata import major_versions_differ, MesonVersionMismatchException
 from .coredata import version as coredata_version
@@ -532,6 +531,23 @@ class Installer:
                     else:
                         raise
 
+def rebuild_all(wd: str) -> bool:
+    if not (Path(wd) / 'build.ninja').is_file():
+        print('Only ninja backend is supported to rebuild the project before installation.')
+        return True
+
+    ninja = environment.detect_ninja()
+    if not ninja:
+        print("Can't find ninja, can't rebuild test.")
+        return False
+
+    ret = subprocess.run(ninja + ['-C', wd]).returncode
+    if ret != 0:
+        print('Could not rebuild {}'.format(wd))
+        return False
+
+    return True
+
 def run(opts):
     datafilename = 'meson-private/install.dat'
     private_dir = os.path.dirname(datafilename)