Yo dawg, we heard you liked subprojects so we put subprojects in your subprojects so now you can use subprojects when you are using subprojects.

test cases/common/53 subproject subproject/meson.build

@@ -0,0 +1,7 @@
+project('sub sub', 'c')
+
+a = subproject('a')
+lib = a.get_variable('l')
+
+exe = executable('prog', 'prog.c', link_with : lib)
+test('basic', exe)

test cases/common/53 subproject subproject/prog.c

@@ -0,0 +1,5 @@
+int func();
+
+int main(int argc, char **argv) {
+    return func() == 42 ? 0 : 1;
+}

test cases/common/53 subproject subproject/subprojects/a/a.c

@@ -0,0 +1,4 @@
+int func2();
+
+int func() { return func2(); }
+

test cases/common/53 subproject subproject/subprojects/a/meson.build

@@ -0,0 +1,4 @@
+project('a', 'c')
+
+b = subproject('b')
+l = shared_library('a', 'a.c', link_with : b.get_variable('lb'))

test cases/common/53 subproject subproject/subprojects/b/b.c

@@ -0,0 +1,3 @@
+int func2() {
+    return 42;
+}

test cases/common/53 subproject subproject/subprojects/b/meson.build

@@ -0,0 +1,3 @@
+project('b', 'c')
+
+lb = shared_library('b', 'b.c')