build: Use add_test_setup() to allow tests to be run under valgrind

This means we can specify the standard options for testing GLib under
valgrind consistently, so that developers can use `meson test
--setup=valgrind` to run them.

Port the existing valgrind CI to use them (this will not change its
functional behaviour).

Suggested by Marco Trevisan at
https://gitlab.gnome.org/GNOME/glib/-/merge_requests/2717#note_1478891.

Signed-off-by: Philip Withnall <pwithnall@endlessos.org>

.gitlab-ci.yml

@@ -225,8 +225,7 @@ valgrind:
     # See https://gitlab.gnome.org/GNOME/glib/-/merge_requests/2710
     - ulimit -Sn 1024
     - bash -x ./.gitlab-ci/run-tests.sh
-                 --wrap "valgrind --tool=memcheck --error-exitcode=1 --track-origins=yes --leak-check=full --leak-resolution=high --num-callers=50 --show-leak-kinds=definite,possible --show-error-list=yes --suppressions=${CI_PROJECT_DIR}/tools/glib.supp"
-                 --no-suite no-valgrind
+                 --setup valgrind
                  --no-suite slow
   # FIXME: Remove this when we have zero valgrind leaks.
   # https://gitlab.gnome.org/GNOME/glib/issues/333

meson.build

@@ -102,6 +102,30 @@ installed_tests_template_tap = files('tests/template-tap.test.in')
 # Don’t build the tests unless we can run them (either natively, in an exe wrapper, or by installing them for later use)
 build_tests = get_option('tests') and (meson.can_run_host_binaries() or installed_tests_enabled)
 
+# Allow the tests to be easily run under valgrind using --setup=valgrind
+valgrind = find_program('valgrind', required: false)
+if valgrind.found()
+  suppression_file = files('tools' / 'glib.supp')
+
+  add_test_setup('valgrind',
+    exclude_suites: [ 'no-valgrind' ],
+    exe_wrapper: [
+      valgrind,
+      '--tool=memcheck',
+      '--error-exitcode=1',
+      '--track-origins=yes',
+      '--leak-check=full',
+      '--leak-resolution=high',
+      '--num-callers=50',
+      '--show-leak-kinds=definite,possible',
+      '--show-error-list=yes',
+      '--suppressions=@0@'.format(meson.project_source_root() /
+        '@0@'.format(suppression_file[0])),
+    ],
+    timeout_multiplier: 10,
+  )
+endif
+
 add_project_arguments('-D_GNU_SOURCE', language: 'c')
 
 if host_system == 'qnx'