backends: add CustomTargetIndexes to meson-{test,benchmark}-prereq

If a CustomTargetIndex is passed as an argument to a test, running meson
test (with no test glob) does not automatically build the custom_target
before running the test, because CustomTargetIndex outputs are not added
as prerequisites to the meson-test-prereq and meson-benchmark-prereq
targets.

Fixes: #14743
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/test cases/unit/131 custom target index test/meson.build b/test cases/unit/131 custom target index test/meson.build
new file mode 100644
index 000000000..adbbb4df4
--- /dev/null
+++ b/test cases/unit/131 custom target index test/meson.build
@@ -0,0 +1,16 @@
+# testcase by blue42u
+project('test')
+python3 = find_program('python3')
+
+gen_code = '''
+import sys, pathlib
+pathlib.Path(sys.argv[1]).write_text("foo")
+pathlib.Path(sys.argv[2]).write_text("bar")'''
+foobar_txt = custom_target(command: [python3, '-c', gen_code, '@OUTPUT@'], output: ['foo.txt', 'bar.txt'])
+
+test_code = '''
+import sys, pathlib
+sys.exit(0 if pathlib.Path(sys.argv[1]).read_text() == sys.argv[2] else 4)'''
+
+test('foo.txt', python3, args: ['-c', test_code, foobar_txt[0], 'foo'])
+test('bar.txt', python3, args: ['-c', test_code, foobar_txt[1], 'bar'])