test cases: add test for @OUTPUT0@ substitution rules

when a generator used a single @OUTPUT0@ and was processing multiple targets,
the variable was replaced with a wrong value

test cases/common/52 object generator/dir/meson.build

@@ -0,0 +1,6 @@
+#check with a single @OUTPUT0@ in a subdirectory and multiple inputs
+gen4 = generator(python,
+ output : ['@BASENAME@.o'],
+ arguments : [comp, cc, '@INPUT@', '@OUTPUT0@'])
+
+generated4 = gen4.process(files('source5.c', 'source6.c'))

test cases/common/52 object generator/dir/source5.c

@@ -0,0 +1,3 @@
+int func5_in_obj(void) {
+    return 0;
+}

test cases/common/52 object generator/dir/source6.c

@@ -0,0 +1,3 @@
+int func6_in_obj(void) {
+    return 0;
+}

test cases/common/52 object generator/meson.build

@@ -37,6 +37,8 @@ gen3 = generator(python,
 
 generated3 = gen3.process(['source4.c'])
 
-e = executable('prog', 'prog.c', generated, generated2, generated3)
+subdir('dir')
+
+e = executable('prog', 'prog.c', generated, generated2, generated3, generated4)
 
 test('objgen', e)

test cases/common/52 object generator/prog.c

@@ -2,7 +2,10 @@ int func1_in_obj(void);
 int func2_in_obj(void);
 int func3_in_obj(void);
 int func4_in_obj(void);
+int func5_in_obj(void);
+int func6_in_obj(void);
+
 
 int main(void) {
-    return func1_in_obj() + func2_in_obj() + func3_in_obj() + func4_in_obj();
+    return func1_in_obj() + func2_in_obj() + func3_in_obj() + func4_in_obj() + func5_in_obj() + func6_in_obj();
 }