Ninja: add response file support on Windows

When MinGW is used slashes are used for dependencies
because ar.exe can't read rsp files with backslashes.

Many thx to Claus Klein for starting working on this.

Source/cmGlobalNinjaGenerator.cxx

@@ -89,7 +89,10 @@ std::string cmGlobalNinjaGenerator::EncodePath(const std::string &path)
 {
   std::string result = path;
 #ifdef _WIN32
-  cmSystemTools::ReplaceString(result, "/", "\\");
+  if(UsingMinGW)
+    cmSystemTools::ReplaceString(result, "\\", "/");
+  else
+    cmSystemTools::ReplaceString(result, "/", "\\");
 #endif
   return EncodeLiteral(result);
 }
@@ -101,7 +104,8 @@ void cmGlobalNinjaGenerator::WriteBuild(std::ostream& os,
                                         const cmNinjaDeps& explicitDeps,
                                         const cmNinjaDeps& implicitDeps,
                                         const cmNinjaDeps& orderOnlyDeps,
-                                        const cmNinjaVars& variables)
+                                        const cmNinjaVars& variables,
+                                        int cmdLineLimit)
 {
   // Make sure there is a rule.
   if(rule.empty())
@@ -123,50 +127,59 @@ void cmGlobalNinjaGenerator::WriteBuild(std::ostream& os,
 
   cmGlobalNinjaGenerator::WriteComment(os, comment);
 
-  std::ostringstream builds;
+  std::stringstream arguments;
 
   // TODO: Better formatting for when there are multiple input/output files.
 
-  // Write outputs files.
-  builds << "build";
-  for(cmNinjaDeps::const_iterator i = outputs.begin();
-      i != outputs.end();
-      ++i)
-    builds << " " << EncodeIdent(EncodePath(*i), os);
-  builds << ":";
-
-  // Write the rule.
-  builds << " " << rule;
-
   // Write explicit dependencies.
   for(cmNinjaDeps::const_iterator i = explicitDeps.begin();
       i != explicitDeps.end();
       ++i)
-    builds  << " " << EncodeIdent(EncodePath(*i), os);
+    arguments  << " " << EncodeIdent(EncodePath(*i), os);
 
   // Write implicit dependencies.
   if(!implicitDeps.empty())
     {
-    builds << " |";
+    arguments << " |";
     for(cmNinjaDeps::const_iterator i = implicitDeps.begin();
         i != implicitDeps.end();
         ++i)
-      builds  << " " << EncodeIdent(EncodePath(*i), os);
+      arguments  << " " << EncodeIdent(EncodePath(*i), os);
     }
 
   // Write order-only dependencies.
   if(!orderOnlyDeps.empty())
     {
-    builds << " ||";
+    arguments << " ||";
     for(cmNinjaDeps::const_iterator i = orderOnlyDeps.begin();
         i != orderOnlyDeps.end();
         ++i)
-      builds  << " " << EncodeIdent(EncodePath(*i), os);
+      arguments  << " " << EncodeIdent(EncodePath(*i), os);
     }
 
-  builds << "\n";
+  arguments << "\n";
+
+
+  std::ostringstream builds;
+
+  // Write outputs files.
+  builds << "build";
+  for(cmNinjaDeps::const_iterator i = outputs.begin();
+      i != outputs.end();
+      ++i)
+    builds << " " << EncodeIdent(EncodePath(*i), os);
+  builds << ":";
+
+
+  // Write the rule.
+  builds << " " << rule;
+
+  // check if a response file rule should be used
+  const std::string args = arguments.str();
+  if (cmdLineLimit > 0 && args.size() > (size_t)cmdLineLimit)
+    builds << "_RSPFILE";
 
-  os << builds.str();
+  os << builds.str() << args;
 
   // Write the variables bound to this build statement.
   for(cmNinjaVars::const_iterator i = variables.begin();
@@ -200,6 +213,7 @@ void cmGlobalNinjaGenerator::AddCustomCommandRule()
                 "$DESC",
                 "Rule for running custom commands.",
                 /*depfile*/ "",
+                /*rspfile*/ "",
                 /*restat*/ true);
 }
 
@@ -233,6 +247,7 @@ void cmGlobalNinjaGenerator::WriteRule(std::ostream& os,
                                        const std::string& description,
                                        const std::string& comment,
                                        const std::string& depfile,
+                                       const std::string& rspfile,
                                        bool restat,
                                        bool generator)
 {
@@ -277,6 +292,14 @@ void cmGlobalNinjaGenerator::WriteRule(std::ostream& os,
     os << "description = " << description << "\n";
     }
 
+  if(!rspfile.empty())
+    {
+      cmGlobalNinjaGenerator::Indent(os, 1);
+      os << "rspfile = " << rspfile << "\n";
+      cmGlobalNinjaGenerator::Indent(os, 1);
+      os << "rspfile_content = $in" << "\n";
+    }
+
   if(restat)
     {
     cmGlobalNinjaGenerator::Indent(os, 1);
@@ -424,8 +447,17 @@ void cmGlobalNinjaGenerator
       }
     this->ResolveLanguageCompiler(*l, mf, optional);
     }
+
+  // check for mingw
+  std::string cc = mf->GetDefinition("CMAKE_C_COMPILER");
+  if(cc.find("gcc.exe") != std::string::npos)
+    {
+    UsingMinGW = true;
+    }
 }
 
+bool cmGlobalNinjaGenerator::UsingMinGW = false;
+
 // Implemented by:
 //   cmGlobalUnixMakefileGenerator3
 //   cmGlobalVisualStudio10Generator
@@ -483,6 +515,7 @@ void cmGlobalNinjaGenerator::AddRule(const std::string& name,
                                      const std::string& description,
                                      const std::string& comment,
                                      const std::string& depfile,
+                                     const std::string& rspfile,
                                      bool restat,
                                      bool generator)
 {
@@ -497,6 +530,7 @@ void cmGlobalNinjaGenerator::AddRule(const std::string& name,
                                     description,
                                     comment,
                                     depfile,
+                                    rspfile,
                                     restat,
                                     generator);
 }
@@ -841,6 +875,7 @@ void cmGlobalNinjaGenerator::WriteTargetRebuildManifest(std::ostream& os)
             "Re-running CMake...",
             "Rule for re-running cmake.",
             /*depfile=*/ "",
+            /*rspfile=*/ "",
             /*restat=*/ false,
             /*generator=*/ true);
 
@@ -878,6 +913,7 @@ void cmGlobalNinjaGenerator::WriteTargetClean(std::ostream& os)
             "Cleaning all built files...",
             "Rule for cleaning all built files.",
             /*depfile=*/ "",
+            /*rspfile=*/ "",
             /*restat=*/ false,
             /*generator=*/ false);
   WriteBuild(os,
@@ -898,6 +934,7 @@ void cmGlobalNinjaGenerator::WriteTargetHelp(std::ostream& os)
             "All primary targets available:",
             "Rule for printing all primary targets available.",
             /*depfile=*/ "",
+            /*rspfile=*/ "",
             /*restat=*/ false,
             /*generator=*/ false);
   WriteBuild(os,

Source/cmGlobalNinjaGenerator.h

@@ -81,7 +81,8 @@ public:
                          const cmNinjaDeps& explicitDeps,
                          const cmNinjaDeps& implicitDeps,
                          const cmNinjaDeps& orderOnlyDeps,
-                         const cmNinjaVars& variables);
+                         const cmNinjaVars& variables,
+                         int cmdLineLimit = -1);
 
   /**
    * Helper to write a build statement with the special 'phony' rule.
@@ -113,6 +114,7 @@ public:
                         const std::string& description,
                         const std::string& comment = "",
                         const std::string& depfile = "",
+                        const std::string& rspfile = ""					,
                         bool restat = false,
                         bool generator = false);
 
@@ -226,6 +228,7 @@ public:
                const std::string& description,
                const std::string& comment = "",
                const std::string& depfile = "",
+               const std::string& rspfile = "",
                bool restat = false,
                bool generator = false);
 
@@ -341,6 +344,8 @@ private:
   TargetAliasMap TargetAliases;
 
   static cmLocalGenerator* LocalGenerator;
+
+  static bool UsingMinGW;
 };
 
 #endif // ! cmGlobalNinjaGenerator_h

Source/cmLocalNinjaGenerator.cxx

@@ -275,16 +275,16 @@ std::string cmLocalNinjaGenerator::BuildCommandLine(
     return ":";
 #endif
 
-  // TODO: This will work only on Unix platforms. I don't
-  // want to use a link.txt file because I will lose the benefit of the
-  // $in variables. A discussion about dealing with multiple commands in
-  // a rule is started here:
-  // groups.google.com/group/ninja-build/browse_thread/thread/d515f23a78986008
   std::ostringstream cmd;
   for (std::vector<std::string>::const_iterator li = cmdLines.begin();
        li != cmdLines.end(); ++li) {
-    if (li != cmdLines.begin())
+    if (li != cmdLines.begin()) {
       cmd << " && ";
+#ifdef _WIN32
+    } else if (cmdLines.size() > 1) {
+      cmd << "cmd.exe /c ";
+#endif
+    }
     cmd << *li;
   }
   return cmd.str();

Source/cmNinjaNormalTargetGenerator.cxx

@@ -90,7 +90,10 @@ void cmNinjaNormalTargetGenerator::Generate()
     }
   else
     {
-    this->WriteLinkRule();
+    this->WriteLinkRule(false);
+#ifdef _WIN32 // TODO response file support only Linux
+    this->WriteLinkRule(true);
+#endif
     this->WriteLinkStatement();
     }
 
@@ -144,17 +147,38 @@ cmNinjaNormalTargetGenerator
 
 void
 cmNinjaNormalTargetGenerator
-::WriteLinkRule()
+::WriteLinkRule(bool useResponseFile)
 {
   cmTarget::TargetType targetType = this->GetTarget()->GetType();
   std::string ruleName = this->LanguageLinkerRule();
 
+  // Select whether to use a response file for objects.
+  std::string rspfile;
+
   if (!this->GetGlobalGenerator()->HasRule(ruleName)) {
     cmLocalGenerator::RuleVariables vars;
     vars.RuleLauncher = "RULE_LAUNCH_LINK";
     vars.CMTarget = this->GetTarget();
     vars.Language = this->TargetLinkLanguage;
-    vars.Objects = "$in";
+
+    std::string responseFlag;
+    if (!useResponseFile) {
+      vars.Objects = "$in";
+    } else {
+        // handle response file
+        std::string cmakeLinkVar = std::string("CMAKE_") +
+                        this->TargetLinkLanguage + "_RESPONSE_FILE_LINK_FLAG";
+        const char * flag = GetMakefile()->GetDefinition(cmakeLinkVar.c_str());
+        if(flag) {
+          responseFlag = flag;
+        } else {
+          responseFlag = "@";
+        }
+        ruleName += "_RSPFILE";
+        rspfile = "$out.rsp";
+        responseFlag += rspfile;
+        vars.Objects = responseFlag.c_str();
+    }
     std::string objdir =
       this->GetLocalGenerator()->GetHomeRelativeOutputPath();
     objdir += objdir.empty() ? "" : "/";
@@ -201,7 +225,7 @@ cmNinjaNormalTargetGenerator
       vars.LanguageCompileFlags = langFlags.c_str();
     }
 
-    // Rule for linking library.
+    // Rule for linking library/executable.
     std::vector<std::string> linkCmds = this->ComputeLinkCmd();
     for(std::vector<std::string>::iterator i = linkCmds.begin();
         i != linkCmds.end();
@@ -214,7 +238,7 @@ cmNinjaNormalTargetGenerator
     std::string linkCmd =
       this->GetLocalGenerator()->BuildCommandLine(linkCmds);
 
-    // Write the linker rule.
+    // Write the linker rule with response file if needed.
     std::ostringstream comment;
     comment << "Rule for linking " << this->TargetLinkLanguage << " "
             << this->GetVisibleTypeName() << ".";
@@ -224,7 +248,9 @@ cmNinjaNormalTargetGenerator
     this->GetGlobalGenerator()->AddRule(ruleName,
                                         linkCmd,
                                         description.str(),
-                                        comment.str());
+                                        comment.str(),
+                                        /*depfile*/ "",
+                                        rspfile);
   }
 
   if (this->TargetNameOut != this->TargetNameReal) {
@@ -456,6 +482,12 @@ void cmNinjaNormalTargetGenerator::WriteLinkStatement()
     symlinkVars["POST_BUILD"] = postBuildCmdLine;
   }
 
+  int cmdLineLimit = -1;
+#ifdef _WIN32
+  cmdLineLimit = 30000;
+#else
+  // TODO
+#endif
   // Write the build statement for this target.
   cmGlobalNinjaGenerator::WriteBuild(this->GetBuildFileStream(),
                                      comment.str(),
@@ -464,7 +496,8 @@ void cmNinjaNormalTargetGenerator::WriteLinkStatement()
                                      explicitDeps,
                                      implicitDeps,
                                      emptyDeps,
-                                     vars);
+                                     vars,
+                                     cmdLineLimit);
 
   if (targetOutput != targetOutputReal) {
     if (targetType == cmTarget::EXECUTABLE) {

Source/cmNinjaNormalTargetGenerator.h

@@ -30,7 +30,7 @@ private:
   std::string LanguageLinkerRule() const;
   const char* GetVisibleTypeName() const;
   void WriteLanguagesRules();
-  void WriteLinkRule();
+  void WriteLinkRule(bool useResponseFile);
   void WriteLinkStatement();
   void WriteObjectLibStatement();
   std::vector<std::string> ComputeLinkCmd();