Fix run_targets running scripts from different subdirs.

mesonbuild/interpreter.py

@@ -4079,6 +4079,8 @@ This will become a hard error in the future.''' % kwargs['input'], location=self
             if isinstance(i, dependencies.ExternalProgram) and not i.found():
                 raise InterpreterException('Tried to use non-existing executable {!r}'.format(i.name))
             cleaned_args.append(i)
+        if isinstance(cleaned_args[0], str):
+            cleaned_args[0] = self.func_find_program(node, cleaned_args[0], {})
         name = args[0]
         if not isinstance(name, str):
             raise InterpreterException('First argument must be a string.')

run_unittests.py

@@ -2384,6 +2384,15 @@ class AllPlatformTests(BasePlatformTests):
         self.run_target('check-env')
         self.run_target('check-env-ct')
 
+    def test_run_target_subdir(self):
+        '''
+        Test that run_targets are run from the correct directory
+        https://github.com/mesonbuild/meson/issues/957
+        '''
+        testdir = os.path.join(self.common_test_dir, '52 run target')
+        self.init(testdir)
+        self.run_target('textprinter')
+
     def test_install_introspection(self):
         '''
         Tests that the Meson introspection API exposes install filenames correctly

test cases/common/52 run target/meson.build

@@ -103,3 +103,5 @@ custom_target('check-env-ct',
         'MY_ENV': '1'},
   output: 'check-env-ct',
 )
+
+run_target('textprinter', command: ['subdir/textprinter.py'])

test cases/common/52 run target/subdir/textprinter.py

@@ -0,0 +1,3 @@
+#!/usr/bin/env python3
+
+print('I am a script. Being run.')