makeutl.ads (In_Place_Option): New constant.

2015-05-22  Pascal Obry  <obry@adacore.com>

	* makeutl.ads (In_Place_Option): New constant.
	* prj.ads (Obj_Root_Dir): New variable (absolute path to relocate
	objects).
	(Root_Src_Tree): New variable (absolute path of root source tree).
	* prj-conf.adb (Do_Autoconf): Take into account the object root
	directory (if defined) to generate configuration project.
	* prj-nmsc.adb (Get_Directories): Handle case where Obj_Root_Dir
	is defined.
	(Locate_Directory): Likewise.

From-SVN: r223543

gcc/ada/ChangeLog

 2015-05-22  Pascal Obry  <obry@adacore.com>
 
+	* makeutl.ads (In_Place_Option): New constant.
+	* prj.ads (Obj_Root_Dir): New variable (absolute path to relocate
+	objects).
+	(Root_Src_Tree): New variable (absolute path of root source tree).
+	* prj-conf.adb (Do_Autoconf): Take into account the object root
+	directory (if defined) to generate configuration project.
+	* prj-nmsc.adb (Get_Directories): Handle case where Obj_Root_Dir
+	is defined.
+	(Locate_Directory): Likewise.
+
+2015-05-22  Pascal Obry  <obry@adacore.com>
+
 	* prj-util.ads, prj-util.adb (Relative_Path): New routine.
 
 2015-05-22  Bob Duff  <duff@adacore.com>

gcc/ada/makeutl.ads

@@ -6,7 +6,7 @@
 --                                                                          --
 --                                 S p e c                                  --
 --                                                                          --
---          Copyright (C) 2004-2014, Free Software Foundation, Inc.         --
+--          Copyright (C) 2004-2015, Free Software Foundation, Inc.         --
 --                                                                          --
 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
 -- terms of the  GNU General Public License as published  by the Free Soft- --
@@ -66,6 +66,10 @@ package Makeutl is
    --  Switch used to indicate that the real directories (object, exec,
    --  library, ...) are subdirectories of those in the project file.
 
+   In_Place_Option : constant String := "--in-place";
+   --  Switch to build out-of-tree. In this context the object, exec and
+   --  library directories are relocated to the current working directory.
+
    Unchecked_Shared_Lib_Imports : constant String :=
                                     "--unchecked-shared-lib-imports";
    --  Command line switch to allow shared library projects to import projects

gcc/ada/prj-conf.adb

@@ -6,7 +6,7 @@
 --                                                                          --
 --                                 B o d y                                  --
 --                                                                          --
---            Copyright (C) 2006-2014, Free Software Foundation, Inc.       --
+--            Copyright (C) 2006-2015, Free Software Foundation, Inc.       --
 --                                                                          --
 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
 -- terms of the  GNU General Public License as published  by the Free Soft- --
@@ -962,17 +962,39 @@ package body Prj.Conf is
 
          --  First, find the object directory of the Conf_Project
 
+         --  If the object directory is a relative one and Obj_Root_Dir is set,
+         --  first add it.
+
+         Name_Len := 0;
+
          if Obj_Dir = Nil_Variable_Value or else Obj_Dir.Default then
-            Get_Name_String (Conf_Project.Directory.Display_Name);
+
+            if Obj_Root_Dir /= null then
+               Add_Str_To_Name_Buffer (Obj_Root_Dir.all);
+               Add_Str_To_Name_Buffer
+                 (Relative_Path
+                    (Get_Name_String (Conf_Project.Directory.Display_Name),
+                     Root_Src_Tree.all));
+            else
+               Get_Name_String (Conf_Project.Directory.Display_Name);
+            end if;
 
          else
             if Is_Absolute_Path (Get_Name_String (Obj_Dir.Value)) then
                Get_Name_String (Obj_Dir.Value);
 
             else
-               Name_Len := 0;
-               Add_Str_To_Name_Buffer
-                 (Get_Name_String (Conf_Project.Directory.Display_Name));
+               if Obj_Root_Dir /= null then
+                  Add_Str_To_Name_Buffer (Obj_Root_Dir.all);
+                  Add_Str_To_Name_Buffer
+                    (Relative_Path
+                       (Get_Name_String (Conf_Project.Directory.Display_Name),
+                        Root_Src_Tree.all));
+               else
+                  Add_Str_To_Name_Buffer
+                    (Get_Name_String (Conf_Project.Directory.Display_Name));
+               end if;
+
                Add_Str_To_Name_Buffer (Get_Name_String (Obj_Dir.Value));
             end if;
          end if;

gcc/ada/prj-nmsc.adb

@@ -5589,7 +5589,9 @@ package body Prj.Nmsc is
             end if;
          end if;
 
-      elsif not No_Sources and then Subdirs /= null then
+      elsif not No_Sources
+        and then (Subdirs /= null or else Obj_Root_Dir /= null)
+      then
          Name_Len := 1;
          Name_Buffer (1) := '.';
          Locate_Directory
@@ -6204,7 +6206,35 @@ package body Prj.Nmsc is
       The_Name        : File_Name_Type;
 
    begin
-      Get_Name_String (Name);
+      --  Check if we have a root-object dir specified, if so relocate all
+      --  artefact directories to it.
+
+      if Obj_Root_Dir /= null
+        and then Create /= ""
+        and then not Is_Absolute_Path (Get_Name_String (Name))
+      then
+         Name_Len := 0;
+         Add_Str_To_Name_Buffer (Obj_Root_Dir.all);
+         Add_Str_To_Name_Buffer
+           (Relative_Path
+              (The_Parent (The_Parent'First .. The_Parent_Last),
+               Root_Src_Tree.all));
+         Add_Str_To_Name_Buffer (Get_Name_String (Name));
+
+      else
+         if Obj_Root_Dir /= null and then Create /= "" then
+
+            --  Issue a warning that we cannot relocate absolute obj dir
+
+            Err_Vars.Error_Msg_File_1 := Name;
+            Error_Or_Warning
+              (Data.Flags, Warning,
+               "{ cannot relocate absolute object directory",
+               No_Location, Project);
+         end if;
+
+         Get_Name_String (Name);
+      end if;
 
       --  Add Subdirs.all if it is a directory that may be created and
       --  Subdirs is not null;

gcc/ada/prj.ads

@@ -6,7 +6,7 @@
 --                                                                          --
 --                                 S p e c                                  --
 --                                                                          --
---          Copyright (C) 2001-2014, Free Software Foundation, Inc.         --
+--          Copyright (C) 2001-2015, Free Software Foundation, Inc.         --
 --                                                                          --
 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
 -- terms of the  GNU General Public License as published  by the Free Soft- --
@@ -61,6 +61,17 @@ package Prj is
    --  The value after the equal sign in switch --subdirs=...
    --  Contains the relative subdirectory.
 
+   Obj_Root_Dir : String_Ptr := null;
+   --  A root directory for building out-of-tree projects. All relative object
+   --  directories will be rooted at this location. If Subdirs is also set it
+   --  will be added at the end too.
+
+   Root_Src_Tree : String_Ptr := null;
+   --  When using out-of-tree build we need to keep information about the root
+   --  directory source tree to properly relocate all projects to this root
+   --  directory. Note that the root source directory is not necessary the
+   --  directory of the main project.
+
    type Library_Support is (None, Static_Only, Full);
    --  Support for Library Project File.
    --  - None: Library Project Files are not supported at all