ENH: Simplified and moved link script implementation up from cmMakefileLibraryTargetGenerator to cmMakefileTargetGenerator and use for cmMakefileExecutableTargetGenerator too. This addresses bug #6192.

Source/cmMakefileExecutableTargetGenerator.cxx

@@ -339,14 +339,18 @@ void cmMakefileExecutableTargetGenerator::WriteExecutableRule(bool relink)
       ->AppendCustomCommands(commands, this->Target->GetPreLinkCommands());
     }
 
+  // Determine whether a link script will be used.
+  bool useLinkScript = this->GlobalGenerator->GetUseLinkScript();
+
   // Construct the main link rule.
+  std::vector<std::string> real_link_commands;
   std::string linkRuleVar = "CMAKE_";
   linkRuleVar += linkLanguage;
   linkRuleVar += "_LINK_EXECUTABLE";
   std::string linkRule =
     this->Makefile->GetRequiredDefinition(linkRuleVar.c_str());
   std::vector<std::string> commands1;
-  cmSystemTools::ExpandListArgument(linkRule, commands1);
+  cmSystemTools::ExpandListArgument(linkRule, real_link_commands);
   if(this->Target->GetPropertyAsBool("ENABLE_EXPORTS"))
     {
     // If a separate rule for creating an import library is specified
@@ -357,37 +361,12 @@ void cmMakefileExecutableTargetGenerator::WriteExecutableRule(bool relink)
     if(const char* rule =
        this->Makefile->GetDefinition(implibRuleVar.c_str()))
       {
-      cmSystemTools::ExpandListArgument(rule, commands1);
+      cmSystemTools::ExpandListArgument(rule, real_link_commands);
       }
     }
-  this->LocalGenerator->CreateCDCommand
-    (commands1,
-     this->Makefile->GetStartOutputDirectory(),
-     this->Makefile->GetHomeOutputDirectory());
-  commands.insert(commands.end(), commands1.begin(), commands1.end());
-
-  // Add a rule to create necessary symlinks for the library.
-  if(targetOutPath != targetOutPathReal)
-    {
-    std::string symlink = "$(CMAKE_COMMAND) -E cmake_symlink_executable ";
-    symlink += targetOutPathReal;
-    symlink += " ";
-    symlink += targetOutPath;
-    commands1.clear();
-    commands1.push_back(symlink);
-    this->LocalGenerator->CreateCDCommand(commands1,
-                                  this->Makefile->GetStartOutputDirectory(),
-                                  this->Makefile->GetHomeOutputDirectory());
-    commands.insert(commands.end(), commands1.begin(), commands1.end());
-    }
-
-  // Add the post-build rules when building but not when relinking.
-  if(!relink)
-    {
-    this->LocalGenerator->
-      AppendCustomCommands(commands, this->Target->GetPostBuildCommands());
-    }
 
+  // Expand the rule variables.
+  {
   // Collect up flags to link in needed libraries.
   cmOStringStream linklibs;
   this->LocalGenerator->OutputLinkLibraries(linklibs, *this->Target, relink);
@@ -397,11 +376,19 @@ void cmMakefileExecutableTargetGenerator::WriteExecutableRule(bool relink)
   std::string variableName;
   std::string variableNameExternal;
   this->WriteObjectsVariable(variableName, variableNameExternal);
-  std::string buildObjs = "$(";
+  std::string buildObjs;
-  buildObjs += variableName;
+  if(useLinkScript)
-  buildObjs += ") $(";
+    {
-  buildObjs += variableNameExternal;
+    this->WriteObjectsString(buildObjs);
-  buildObjs += ")";
+    }
+  else
+    {
+    buildObjs = "$(";
+    buildObjs += variableName;
+    buildObjs += ") $(";
+    buildObjs += variableNameExternal;
+    buildObjs += ")";
+    }
   std::string cleanObjs = "$(";
   cleanObjs += variableName;
   cleanObjs += ")";
@@ -435,12 +422,55 @@ void cmMakefileExecutableTargetGenerator::WriteExecutableRule(bool relink)
   vars.LinkFlags = linkFlags.c_str();
   // Expand placeholders in the commands.
   this->LocalGenerator->TargetImplib = targetOutPathImport;
-  for(std::vector<std::string>::iterator i = commands.begin();
+  for(std::vector<std::string>::iterator i = real_link_commands.begin();
-      i != commands.end(); ++i)
+      i != real_link_commands.end(); ++i)
     {
     this->LocalGenerator->ExpandRuleVariables(*i, vars);
     }
   this->LocalGenerator->TargetImplib = "";
+  }
+
+  // Optionally convert the build rule to use a script to avoid long
+  // command lines in the make shell.
+  if(useLinkScript)
+    {
+    // Use a link script.
+    const char* name = (relink? "relink.txt" : "link.txt");
+    this->CreateLinkScript(name, real_link_commands, commands1);
+    }
+  else
+    {
+    // No link script.  Just use the link rule directly.
+    commands1 = real_link_commands;
+    }
+  this->LocalGenerator->CreateCDCommand
+    (commands1,
+     this->Makefile->GetStartOutputDirectory(),
+     this->Makefile->GetHomeOutputDirectory());
+  commands.insert(commands.end(), commands1.begin(), commands1.end());
+  commands1.clear();
+
+  // Add a rule to create necessary symlinks for the library.
+  if(targetOutPath != targetOutPathReal)
+    {
+    std::string symlink = "$(CMAKE_COMMAND) -E cmake_symlink_executable ";
+    symlink += targetOutPathReal;
+    symlink += " ";
+    symlink += targetOutPath;
+    commands1.push_back(symlink);
+    this->LocalGenerator->CreateCDCommand(commands1,
+                                  this->Makefile->GetStartOutputDirectory(),
+                                  this->Makefile->GetHomeOutputDirectory());
+    commands.insert(commands.end(), commands1.begin(), commands1.end());
+    commands1.clear();
+    }
+
+  // Add the post-build rules when building but not when relinking.
+  if(!relink)
+    {
+    this->LocalGenerator->
+      AppendCustomCommands(commands, this->Target->GetPostBuildCommands());
+    }
 
   // Write the build rule.
   this->LocalGenerator->WriteMakeRule(*this->BuildFileStream,

Source/cmMakefileLibraryTargetGenerator.cxx

@@ -668,77 +668,16 @@ void cmMakefileLibraryTargetGenerator::WriteLibraryRules
       ->AppendCustomCommands(commands, this->Target->GetPreLinkCommands());
     }
 
-  // Open the link script if it will be used.
+  // Determine whether a link script will be used.
-  bool useLinkScript = false;
+  bool useLinkScript = this->GlobalGenerator->GetUseLinkScript();
-  std::string linkScriptName;
-  std::auto_ptr<cmGeneratedFileStream> linkScriptStream;
-  if(this->GlobalGenerator->GetUseLinkScript() &&
-     (this->Target->GetType() == cmTarget::STATIC_LIBRARY ||
-      this->Target->GetType() == cmTarget::SHARED_LIBRARY ||
-      this->Target->GetType() == cmTarget::MODULE_LIBRARY))
-    {
-    useLinkScript = true;
-    linkScriptName = this->TargetBuildDirectoryFull;
-    if(relink)
-      {
-      linkScriptName += "/relink.txt";
-      }
-    else
-      {
-      linkScriptName += "/link.txt";
-      }
-    std::auto_ptr<cmGeneratedFileStream> lss(
-      new cmGeneratedFileStream(linkScriptName.c_str()));
-    linkScriptStream = lss;
-    }
-
-  std::vector<std::string> link_script_commands;
 
   // Construct the main link rule.
+  std::vector<std::string> real_link_commands;
   std::string linkRule = this->Makefile->GetRequiredDefinition(linkRuleVar);
-  if(useLinkScript)
+  cmSystemTools::ExpandListArgument(linkRule, real_link_commands);
-    {
-    cmSystemTools::ExpandListArgument(linkRule, link_script_commands);
-    std::string link_command = "$(CMAKE_COMMAND) -E cmake_link_script ";
-    link_command += this->Convert(linkScriptName.c_str(),
-                                  cmLocalGenerator::START_OUTPUT,
-                                  cmLocalGenerator::SHELL);
-    link_command += " --verbose=$(VERBOSE)";
-    commands1.push_back(link_command);
-    }
-  else
-    {
-    cmSystemTools::ExpandListArgument(linkRule, commands1);
-    }
-  this->LocalGenerator->CreateCDCommand
-    (commands1,
-     this->Makefile->GetStartOutputDirectory(),
-     this->Makefile->GetHomeOutputDirectory());
-  commands.insert(commands.end(), commands1.begin(), commands1.end());
-
-  // Add a rule to create necessary symlinks for the library.
-  if(targetOutPath != targetOutPathReal)
-    {
-    std::string symlink = "$(CMAKE_COMMAND) -E cmake_symlink_library ";
-    symlink += targetOutPathReal;
-    symlink += " ";
-    symlink += targetOutPathSO;
-    symlink += " ";
-    symlink += targetOutPath;
-    commands1.clear();
-    commands1.push_back(symlink);
-    this->LocalGenerator->CreateCDCommand(commands1,
-                                  this->Makefile->GetStartOutputDirectory(),
-                                  this->Makefile->GetHomeOutputDirectory());
-    commands.insert(commands.end(), commands1.begin(), commands1.end());
-    }
-  // Add the post-build rules when building but not when relinking.
-  if(!relink)
-    {
-    this->LocalGenerator->
-      AppendCustomCommands(commands, this->Target->GetPostBuildCommands());
-    }
 
+  // Expand the rule variables.
+  {
   // Collect up flags to link in needed libraries.
   cmOStringStream linklibs;
   this->LocalGenerator->OutputLinkLibraries(linklibs, *this->Target, relink);
@@ -834,38 +773,55 @@ void cmMakefileLibraryTargetGenerator::WriteLibraryRules
   vars.LanguageCompileFlags = langFlags.c_str();
   // Expand placeholders in the commands.
   this->LocalGenerator->TargetImplib = targetOutPathImport;
-  if(useLinkScript)
+  for(std::vector<std::string>::iterator i = real_link_commands.begin();
+      i != real_link_commands.end(); ++i)
     {
-    for(std::vector<std::string>::iterator i = link_script_commands.begin();
+    this->LocalGenerator->ExpandRuleVariables(*i, vars);
-        i != link_script_commands.end(); ++i)
-      {
-      this->LocalGenerator->ExpandRuleVariables(*i, vars);
-      }
-    }
-  else
-    {
-    for(std::vector<std::string>::iterator i = commands.begin();
-        i != commands.end(); ++i)
-      {
-      this->LocalGenerator->ExpandRuleVariables(*i, vars);
-      }
     }
   this->LocalGenerator->TargetImplib = "";
+  }
 
   // Optionally convert the build rule to use a script to avoid long
   // command lines in the make shell.
   if(useLinkScript)
     {
-    for(std::vector<std::string>::iterator cmd = link_script_commands.begin();
+    // Use a link script.
-        cmd != link_script_commands.end(); ++cmd)
+    const char* name = (relink? "relink.txt" : "link.txt");
-      {
+    this->CreateLinkScript(name, real_link_commands, commands1);
-      // Do not write out empty commands or commands beginning in the
+    }
-      // shell no-op ":".
+  else
-      if(!cmd->empty() && (*cmd)[0] != ':')
+    {
-        {
+    // No link script.  Just use the link rule directly.
-        (*linkScriptStream) << *cmd << "\n";
+    commands1 = real_link_commands;
-        }
+    }
-      }
+  this->LocalGenerator->CreateCDCommand
+    (commands1,
+     this->Makefile->GetStartOutputDirectory(),
+     this->Makefile->GetHomeOutputDirectory());
+  commands.insert(commands.end(), commands1.begin(), commands1.end());
+  commands1.clear();
+
+  // Add a rule to create necessary symlinks for the library.
+  if(targetOutPath != targetOutPathReal)
+    {
+    std::string symlink = "$(CMAKE_COMMAND) -E cmake_symlink_library ";
+    symlink += targetOutPathReal;
+    symlink += " ";
+    symlink += targetOutPathSO;
+    symlink += " ";
+    symlink += targetOutPath;
+    commands1.push_back(symlink);
+    this->LocalGenerator->CreateCDCommand(commands1,
+                                  this->Makefile->GetStartOutputDirectory(),
+                                  this->Makefile->GetHomeOutputDirectory());
+    commands.insert(commands.end(), commands1.begin(), commands1.end());
+    commands1.clear();
+    }
+  // Add the post-build rules when building but not when relinking.
+  if(!relink)
+    {
+    this->LocalGenerator->
+      AppendCustomCommands(commands, this->Target->GetPostBuildCommands());
     }
 
   // Write the build rule.

Source/cmMakefileTargetGenerator.cxx

@@ -1391,3 +1391,35 @@ cmMakefileTargetGenerator
   MultipleOutputPairsType::value_type p(depender, dependee);
   this->MultipleOutputPairs.insert(p);
 }
+
+//----------------------------------------------------------------------------
+void
+cmMakefileTargetGenerator
+::CreateLinkScript(const char* name,
+                   std::vector<std::string> const& link_commands,
+                   std::vector<std::string>& makefile_commands)
+{
+  // Create the link script file.
+  std::string linkScriptName = this->TargetBuildDirectoryFull;
+  linkScriptName += "/";
+  linkScriptName += name;
+  cmGeneratedFileStream linkScriptStream(linkScriptName.c_str());
+  for(std::vector<std::string>::const_iterator cmd = link_commands.begin();
+      cmd != link_commands.end(); ++cmd)
+    {
+    // Do not write out empty commands or commands beginning in the
+    // shell no-op ":".
+    if(!cmd->empty() && (*cmd)[0] != ':')
+      {
+      linkScriptStream << *cmd << "\n";
+      }
+    }
+
+  // Create the makefile command to invoke the link script.
+  std::string link_command = "$(CMAKE_COMMAND) -E cmake_link_script ";
+  link_command += this->Convert(linkScriptName.c_str(),
+                                cmLocalGenerator::START_OUTPUT,
+                                cmLocalGenerator::SHELL);
+  link_command += " --verbose=$(VERBOSE)";
+  makefile_commands.push_back(link_command);
+}

Source/cmMakefileTargetGenerator.h

@@ -128,6 +128,12 @@ protected:
       makefile generators to register such pairs.  */
   void AddMultipleOutputPair(const char* depender, const char* dependee);
 
+  /** Create a script to hold link rules and a command to invoke the
+      script at build time.  */
+  void CreateLinkScript(const char* name,
+                        std::vector<std::string> const& link_commands,
+                        std::vector<std::string>& makefile_commands);
+
   virtual void CloseFileStreams();
   void RemoveForbiddenFlags(const char* flagVar, const char* linkLang,
                             std::string& linkFlags);