add a system allowing to change the D compiler used in all the compilation contexts

docs/options_application.md

@@ -24,6 +24,7 @@ The page exposes unsorted options. In the future some of them might be moved to
 - **dscanUnittests**: If checked the content of the `unittest` blocks are analyzed when using the action __File/Verify with Dscanner__. Do not activate if the results of the static analysis tend to generate irrelevant messages in the tests.
 - **flatLook**: Doesn't draw the buttons shape unless they're hovered by the mouse.
 - **floatingWidgetOnTop**: Keeps the widgets that are not docked on top of the application window.
+- **globalCompiler**: Sets the compiler used when _global_ is used elsewhere. This also to easily switch to a specific compiler when _global_ is selected in all the contexts (runnables, native, dub).
 - **maxReventDocuments**: Sets how many entries can be stored in __File/Open recent file__.
 - **maxReventDocuments**: Sets how many entries can be stored in __Project/Open recent project__.
 - **maxReventProjectsGroups**: Sets how many entries can be stored in __Projects group/Open recent group__.

docs/options_compilers_paths.md

@@ -25,7 +25,7 @@ Up to five D compilers can be defined.
 The combo box at the top is used to select which are the paths passed to the [completion daemon](features_dcd).
 If the completion daemon is launched by _Dexed_ then the change is applied directly after the validation, otherwise it has to be restarted manually.
 
-In other options categories one of these compilers can be selected.
+In other options categories one of these compilers or _global_ can be selected.
 
 * Category _Application_, _nativeProjectCompiler_: defines the compiler used to compile a project that has the native format.
 * Category [_Runnable modules_](features_runnables), _compiler_: defines the compiler used to compile a _runnable module_ or a DUB script.

src/u_compilers.pas

@@ -48,6 +48,8 @@ type
     procedure setUser2ExeName(const value: string);
     procedure setUser2RuntimePath(const value: string);
     procedure setUser2PhobosPath(const value: string);
+  private
+    procedure checkIfGlobalIsGlobal;
   protected
     procedure afterLoad; override;
   published
@@ -154,6 +156,9 @@ type
     destructor destroy; override;
   end;
 
+var
+  globalCompiler: DCompiler;
+
 implementation
 {$R *.lfm}
 
@@ -236,6 +241,15 @@ begin
   inherited;
 end;
 
+procedure TCompilersPaths.checkIfGlobalIsGlobal;
+begin
+  if globalCompiler = DCompiler.global then
+  begin
+    raise Exception.Create('global compiler should not be set the DCompiler.global');
+    globalCompiler := low(DCompiler);
+  end;
+end;
+
 procedure TCompilersPaths.assign(source: TPersistent);
 var
   src: TCompilersPaths;
@@ -521,6 +535,11 @@ begin
     DCompiler.ldmd: exit(exeFullName('ldmd2' + exeExt).fileExists);
     DCompiler.user1: exit(User1ExeName.fileExists);
     DCompiler.user2: exit(User2ExeName.fileExists);
+    DCompiler.global:
+    begin
+      fPaths.checkIfGlobalIsGlobal;
+      exit(isCompilerValid(globalCompiler));
+    end;
   end;
 end;
 
@@ -535,6 +554,11 @@ begin
     DCompiler.ldmd: exit(exeFullName('ldmd2' + exeExt));
     DCompiler.user1: exit(User1ExeName);
     DCompiler.user2: exit(User2ExeName);
+    DCompiler.global:
+    begin
+      checkIfGlobalIsGlobal;
+      exit(getCompilerPath(globalCompiler));
+    end;
   end;
 end;
 
@@ -555,6 +579,8 @@ begin
       begin tryAdd(User1RuntimePath); tryAdd(User1PhobosPath); end;
     DCompiler.user2:
       begin tryAdd(User2RuntimePath); tryAdd(User2PhobosPath); end;
+    DCompiler.global:
+      begin checkIfGlobalIsGlobal; getCompilerImports(globalCompiler, paths); end;
   end;
 end;
 {$ENDREGION}

src/u_dubproject.pas

@@ -217,7 +217,7 @@ type
 
 var
   DubCompiler: DCompiler = dmd;
-  DubCompilerFilename: string = 'dmd';
+  DubCompilerFilename: string;
   Lfm: ILifetimeManager = nil;
 
 const
@@ -895,6 +895,8 @@ begin
     str.Add('--build=' + fBuildTypes[fBuiltTypeIx]);
     if (fConfigs.Count <> 1) and (fConfigs[0] <> DubDefaultConfigName) then
       str.Add('--config=' + fConfigs[fConfigIx]);
+    if DubCompilerFilename.isEmpty then
+      setDubCompiler(dubBuildOptions.compiler);
     str.Add('--compiler=' + DubCompilerFilename);
     dubBuildOptions.getOpts(str);
     result := str.Text;
@@ -1157,6 +1159,8 @@ begin
     if (fConfigs.Count <> 1) and (fConfigs[0] <> DubDefaultConfigName) then
       fDubProc.Parameters.Add('--config=' + fConfigs[fConfigIx]);
   end;
+  if DubCompilerFilename.isEmpty then
+    setDubCompiler(dubBuildOptions.compiler);
   fDubProc.Parameters.Add('--compiler=' + DubCompilerFilename);
   dubBuildOptions.getOpts(fDubProc.Parameters);
   if (command <> dcBuild) and runArgs.isNotEmpty then
@@ -1897,8 +1901,9 @@ end;
 {$ENDREGION}
 
 initialization
-  setDubCompiler(dmd);
+  // setDubCompiler(dmd);
   dubBuildOptions:= TDubBuildOptions.create(nil);
+  DubCompilerFilename := '';
 finalization
   dubBuildOptions.free;
   TDubLocalPackages.deinit;

src/u_interfaces.pas

@@ -379,7 +379,7 @@ type
   end;
 
 
-  DCompiler = (dmd, gdc, gdmd, ldc, ldmd, user1, user2);
+  DCompiler = (dmd, gdc, gdmd, ldc, ldmd, user1, user2, global);
 
   (**
    * Single service provided by the options editor.
@@ -665,7 +665,7 @@ end;
 function usingCompilerInfo(value: DCompiler): string;
 const
   c2id: array[DCompiler] of string = ('dmd', 'gdc', 'gdmd', 'ldc', 'ldmd',
-    'user1', 'user2');
+    'user1', 'user2', 'global');
 begin
   result := format('using %s (%s)',
     [getCompilerSelector.getCompilerPath(value), c2id[value]]);

src/u_main.pas

@@ -10,7 +10,7 @@ uses
   Graphics, strutils, Dialogs, Menus, ActnList, ExtCtrls, process,
   {$IFDEF WINDOWS}Windows, {$ENDIF} XMLPropStorage, SynExportHTML,
   fpjson, jsonscanner, LCLIntf,
-  u_common, u_ceproject, u_synmemo, u_writableComponent, u_simpleget,
+  u_common, u_ceproject, u_synmemo, u_writableComponent, u_simpleget, u_compilers,
   u_widget, u_messages, u_interfaces, u_editor, u_projinspect, u_ceprojeditor,
   u_search, u_miniexplorer, u_libman, u_libmaneditor, u_todolist, u_observer,
   u_toolseditor, u_procinput, u_optionseditor, u_symlist, u_mru, u_processes,
@@ -619,12 +619,14 @@ type
     fShowBuildDuration: boolean;
     fToolBarScaling: TToolBarScaling;
     fAutoKillProcThreshold: dword;
+    fGlobalCompiler: DCompiler;
     function getConsoleProgram: string;
     procedure setConsoleProgram(const value: string);
     function getAdditionalPATH: string;
     procedure setAdditionalPATH(const value: string);
     function getNativeProjecCompiler: DCompiler;
     procedure setNativeProjecCompiler(value: DCompiler);
+    procedure setGlobalCompiler(value: DCompiler);
     procedure setSplitterScsrollSpeed(value: byte);
   published
     property additionalPATH: string read getAdditionalPATH write setAdditionalPath;
@@ -643,6 +645,7 @@ type
     property flatLook: boolean read fFlatLook write fFlatLook;
     property splitterScrollSpeed: byte read fSplitterScrollSpeed write setSplitterScsrollSpeed;
     property showBuildDuration: boolean read fShowBuildDuration write fShowBuildDuration default false;
+    property globalCompiler: DCompiler read fGlobalCompiler write setGLobalCompiler;
     // property toolBarScaling: TToolBarScaling read fToolBarScaling write fToolBarScaling stored false;
     // published for IEditableOptions but stored by DCD wrapper since it reloads before MainForm
     property dcdPort: word read fDcdPort write fDcdPort stored false;
@@ -863,6 +866,14 @@ begin
   u_ceproject.setCEProjectCompiler(value);
 end;
 
+procedure TApplicationOptionsBase.setGlobalCompiler(value: DCompiler);
+begin
+  if value = DCompiler.global then
+    value := low(DCompiler);
+  fGlobalCompiler := value;
+  u_compilers.globalCompiler := value;
+end;
+
 procedure TApplicationOptionsBase.setSplitterScsrollSpeed(value: byte);
 begin
   if value < 1 then
@@ -3044,11 +3055,9 @@ begin
     dmdproc.Options := [poUsePipes, poStderrToOutPut];
     dmdproc.CurrentDirectory:=fDoc.fileName.extractFileDir;
     case fRunnablesOptions.compiler of
-      dmd: dmdProc.Executable := fCompilerSelector.getCompilerPath(dmd);
       gdc, gdmd: dmdProc.Executable := fCompilerSelector.getCompilerPath(gdmd);
       ldc, ldmd: dmdProc.Executable := fCompilerSelector.getCompilerPath(ldmd);
-      user1: dmdProc.Executable := fCompilerSelector.getCompilerPath(user1);
+      else dmdProc.Executable       := fCompilerSelector.getCompilerPath(fRunnablesOptions.compiler);
-      user2: dmdProc.Executable := fCompilerSelector.getCompilerPath(user2);
     end;
     dmdproc.Parameters.Add(fDoc.fileName);
     if not asObj then