Set GPR.Opt.Target_Value when target is explicitly set

Author: Jugst3r

src/projects/gnatcoll-projects.adb

@@ -7939,6 +7939,7 @@ package body GNATCOLL.Projects is
       Free (Self.Forced_Runtime);
       if Target /= "" then
          Self.Forced_Target := new String'(Target);
+         GPR.Opt.Target_Value := new String'(Normalize_Target_Name (Target));
       end if;
       if Runtime /= "" then
          Self.Forced_Runtime := new String'(Runtime);

testsuite/tests/projects/project_attribute/main_common.gpr

@@ -0,0 +1,15 @@
+abstract project Main_Common is
+
+  Target := project'Target;
+
+  Target_Dir := "error :(";
+  case Target is
+    when "x86_64-pc-linux-gnu" =>
+      Target_Dir := "obj-x86";
+    when others =>
+      Target_Dir := "unknown-";
+  end case;
+
+  Build_Dir := "../" &   Target_Dir;
+
+end Main_Common;

testsuite/tests/projects/project_attribute/main_x86.gpr

@@ -0,0 +1,15 @@
+with "main_common.gpr";
+
+project Main_x86 is
+
+  for Target use "x86_64-pc-linux-gnu";
+
+  for Languages use ("Ada");
+
+  for Source_Dirs use (".");
+
+  for Main use ("main.adb");
+
+  for Object_Dir use Main_Common.Build_Dir;
+
+end Main_x86;

testsuite/tests/projects/project_attribute/test.adb

@@ -0,0 +1,26 @@
+with GNATCOLL.Projects; use GNATCOLL.Projects;
+with GNATCOLL.VFS;      use GNATCOLL.VFS;
+
+with Test_Assert;
+
+function Test return Integer is
+   PT  : Project_Tree;
+   Env : Project_Environment_Access;
+begin
+   Initialize (Env);
+   Env.Set_Target_And_Runtime (Target => "x86_64-pc-linux-gnu");
+
+   GNATCOLL.Projects.Load
+     (PT,
+      Root_Project_Path => Create ("main_x86.gpr"),
+      Env => Env);
+
+   --  Check that the object directory name is as expected
+
+   Test_Assert.Assert
+     (PT.Root_Project.Object_Dir.Base_Dir_Name = "obj-x86");
+
+   PT.Unload;
+   Free (Env);
+   return Test_Assert.Report;
+end Test;

testsuite/tests/projects/project_attribute/test.yaml

@@ -0,0 +1,6 @@
+description: Check that the value for the Project attribute is correct
+data:
+    - "main_common.gpr"
+    - "main_x86.gpr"
+control:
+    - [SKIP, "env.is_cross", "Libutil missing from cross-linux sysroots, see T616-039"]