barebones version and aggregate proc experiment

alire.gpr

@@ -0,0 +1,6 @@
+aggregate project Alire is
+
+    for Project_Path use ("../libhello");
+    for Project_Files use ("hello.gpr");
+
+end Alire;

hello.gpr

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+with "libhello.gpr";
+
+project Hello is
+
+   for Source_Dirs use ("src");
+   for Object_Dir use "obj";
+   for Main use ("hello.adb");
+
+end Hello;
+

src/hello.adb

@@ -0,0 +1,7 @@
+with Libhello;
+
+procedure Hello is
+
+begin
+   Libhello.Hello_World;
+end Hello;