Autogen: Detect rcc feature once during configuration

We used to detect the `rcc` features before every `rcc` list invocation
wich resulted in `rcc` be called twice for every listing operation.

Now we detect the `rcc` list capabilities once during configuration and
pass it to the cmake_autorcc target in the info file.

7 files changed, 109 insertions, 103 deletions

diff --git a/Modules/AutoRccInfo.cmake.in b/Modules/AutoRccInfo.cmake.in
index 7b13b9e..5457a6f 100644
--- a/Modules/AutoRccInfo.cmake.in
+++ b/Modules/AutoRccInfo.cmake.in
@@ -7,5 +7,5 @@ set(ARCC_CMAKE_CURRENT_SOURCE_DIR "@CMAKE_CURRENT_SOURCE_DIR@/")
 set(ARCC_CMAKE_CURRENT_BINARY_DIR "@CMAKE_CURRENT_BINARY_DIR@/")
 set(ARCC_BUILD_DIR @_build_dir@)
 # Qt environment
-set(ARCC_QT_VERSION_MAJOR @_qt_version_major@)
-set(ARCC_QT_RCC_EXECUTABLE @_qt_rcc_executable@)
+set(ARCC_RCC_EXECUTABLE @_qt_rcc_executable@)
+set(ARCC_RCC_LIST_OPTIONS @_qt_rcc_list_options@)
diff --git a/Source/cmQtAutoGen.cxx b/Source/cmQtAutoGen.cxx
index 9dc77ac..b9dd392 100644
--- a/Source/cmQtAutoGen.cxx
+++ b/Source/cmQtAutoGen.cxx
@@ -80,16 +80,6 @@ void MergeOptions(std::vector<std::string>& baseOpts,
   baseOpts.insert(baseOpts.end(), extraOpts.begin(), extraOpts.end());
 }
 
-static std::string utilStripCR(std::string const& line)
-{
-  // Strip CR characters rcc may have printed (possibly more than one!).
-  std::string::size_type cr = line.find('\r');
-  if (cr != std::string::npos) {
-    return line.substr(0, cr);
-  }
-  return line;
-}
-
 /// @brief Reads the resource files list from from a .qrc file - Qt4 version
 /// @return True if the .qrc file was successfully parsed
 static bool RccListInputsQt4(std::string const& fileName,
@@ -107,10 +97,10 @@ static bool RccListInputsQt4(std::string const& fileName,
       qrcContents = osst.str();
     } else {
       if (errorMessage != nullptr) {
-        std::ostringstream ost;
-        ost << "rcc file not readable:\n"
-            << "  " << cmQtAutoGen::Quoted(fileName) << "\n";
-        *errorMessage = ost.str();
+        std::string& err = *errorMessage;
+        err = "rcc file not readable:\n  ";
+        err += cmQtAutoGen::Quoted(fileName);
+        err += "\n";
       }
       allGood = false;
     }
@@ -146,6 +136,7 @@ static bool RccListInputsQt4(std::string const& fileName,
 /// @brief Reads the resource files list from from a .qrc file - Qt5 version
 /// @return True if the .qrc file was successfully parsed
 static bool RccListInputsQt5(std::string const& rccCommand,
+                             std::vector<std::string> const& rccListOptions,
                              std::string const& fileName,
                              std::vector<std::string>& files,
                              std::string* errorMessage)
@@ -155,24 +146,6 @@ static bool RccListInputsQt5(std::string const& rccCommand,
     return false;
   }
 
-  // Read rcc features
-  bool hasDashDashList = false;
-  {
-    std::vector<std::string> command;
-    command.push_back(rccCommand);
-    command.push_back("--help");
-    std::string rccStdOut;
-    std::string rccStdErr;
-    int retVal = 0;
-    bool result = cmSystemTools::RunSingleCommand(
-      command, &rccStdOut, &rccStdErr, &retVal, nullptr,
-      cmSystemTools::OUTPUT_NONE, 0.0, cmProcessOutput::Auto);
-    if (result && retVal == 0 &&
-        rccStdOut.find("--list") != std::string::npos) {
-      hasDashDashList = true;
-    }
-  }
-
   std::string const fileDir = cmSystemTools::GetFilenamePath(fileName);
   std::string const fileNameName = cmSystemTools::GetFilenameName(fileName);
 
@@ -184,7 +157,8 @@ static bool RccListInputsQt5(std::string const& rccCommand,
   {
     std::vector<std::string> command;
     command.push_back(rccCommand);
-    command.push_back(hasDashDashList ? "--list" : "-list");
+    command.insert(command.end(), rccListOptions.begin(),
+                   rccListOptions.end());
     command.push_back(fileNameName);
     result = cmSystemTools::RunSingleCommand(
       command, &rccStdOut, &rccStdErr, &retVal, fileDir.c_str(),
@@ -192,22 +166,32 @@ static bool RccListInputsQt5(std::string const& rccCommand,
   }
   if (!result || retVal) {
     if (errorMessage != nullptr) {
-      std::ostringstream ost;
-      ost << "rcc list process failed for\n  " << cmQtAutoGen::Quoted(fileName)
-          << "\n"
-          << rccStdOut << "\n"
-          << rccStdErr << "\n";
-      *errorMessage = ost.str();
+      std::string& err = *errorMessage;
+      err = "rcc list process failed for:\n  ";
+      err += cmQtAutoGen::Quoted(fileName);
+      err += "\n";
+      err += rccStdOut;
+      err += "\n";
+      err += rccStdErr;
+      err += "\n";
     }
     return false;
   }
 
+  // Lambda to strip CR characters
+  auto StripCR = [](std::string& line) {
+    std::string::size_type cr = line.find('\r');
+    if (cr != std::string::npos) {
+      line = line.substr(0, cr);
+    }
+  };
+
   // Parse rcc std output
   {
     std::istringstream ostr(rccStdOut);
     std::string oline;
     while (std::getline(ostr, oline)) {
-      oline = utilStripCR(oline);
+      StripCR(oline);
       if (!oline.empty()) {
         files.push_back(oline);
       }
@@ -218,17 +202,17 @@ static bool RccListInputsQt5(std::string const& rccCommand,
     std::istringstream estr(rccStdErr);
     std::string eline;
     while (std::getline(estr, eline)) {
-      eline = utilStripCR(eline);
+      StripCR(eline);
       if (cmHasLiteralPrefix(eline, "RCC: Error in")) {
         static std::string searchString = "Cannot find file '";
 
         std::string::size_type pos = eline.find(searchString);
         if (pos == std::string::npos) {
           if (errorMessage != nullptr) {
-            std::ostringstream ost;
-            ost << "rcc lists unparsable output:\n"
-                << cmQtAutoGen::Quoted(eline) << "\n";
-            *errorMessage = ost.str();
+            std::string& err = *errorMessage;
+            err = "rcc lists unparsable output:\n";
+            err += cmQtAutoGen::Quoted(eline);
+            err += "\n";
           }
           return false;
         }
@@ -349,25 +333,26 @@ void cmQtAutoGen::RccMergeOptions(std::vector<std::string>& baseOpts,
   MergeOptions(baseOpts, newOpts, valueOpts, isQt5);
 }
 
-bool cmQtAutoGen::RccListInputs(std::string const& qtMajorVersion,
-                                std::string const& rccCommand,
+bool cmQtAutoGen::RccListInputs(std::string const& rccCommand,
+                                std::vector<std::string> const& rccListOptions,
                                 std::string const& fileName,
                                 std::vector<std::string>& files,
                                 std::string* errorMessage)
 {
   bool allGood = false;
   if (cmSystemTools::FileExists(fileName.c_str())) {
-    if (qtMajorVersion == "4") {
+    if (rccListOptions.empty()) {
       allGood = RccListInputsQt4(fileName, files, errorMessage);
     } else {
-      allGood = RccListInputsQt5(rccCommand, fileName, files, errorMessage);
+      allGood = RccListInputsQt5(rccCommand, rccListOptions, fileName, files,
+                                 errorMessage);
     }
   } else {
     if (errorMessage != nullptr) {
-      std::ostringstream ost;
-      ost << "rcc file does not exist:\n"
-          << "  " << cmQtAutoGen::Quoted(fileName) << "\n";
-      *errorMessage = ost.str();
+      std::string& err = *errorMessage;
+      err = "rcc resource file does not exist:\n  ";
+      err += cmQtAutoGen::Quoted(fileName);
+      err += "\n";
     }
   }
   return allGood;
diff --git a/Source/cmQtAutoGen.h b/Source/cmQtAutoGen.h
index acc092f..e769e93 100644
--- a/Source/cmQtAutoGen.h
+++ b/Source/cmQtAutoGen.h
@@ -61,9 +61,9 @@ public:
 
   /// @brief Reads the resource files list from from a .qrc file
   /// @arg fileName Must be the absolute path of the .qrc file
-  /// @return True if the rcc file was successfully parsed
-  static bool RccListInputs(std::string const& qtMajorVersion,
-                            std::string const& rccCommand,
+  /// @return True if the rcc file was successfully read
+  static bool RccListInputs(std::string const& rccCommand,
+                            std::vector<std::string> const& rccListOptions,
                             std::string const& fileName,
                             std::vector<std::string>& files,
                             std::string* errorMessage = nullptr);
diff --git a/Source/cmQtAutoGeneratorInitializer.cxx b/Source/cmQtAutoGeneratorInitializer.cxx
index 5edddaa..b265f28 100644
--- a/Source/cmQtAutoGeneratorInitializer.cxx
+++ b/Source/cmQtAutoGeneratorInitializer.cxx
@@ -14,6 +14,7 @@
 #include "cmMakefile.h"
 #include "cmOutputConverter.h"
 #include "cmPolicies.h"
+#include "cmProcessOutput.h"
 #include "cmSourceFile.h"
 #include "cmSourceGroup.h"
 #include "cmState.h"
@@ -190,40 +191,6 @@ static bool StaticLibraryCycle(cmGeneratorTarget const* targetOrigin,
   return cycle;
 }
 
-static std::string RccGetExecutable(cmGeneratorTarget const* target,
-                                    std::string const& qtMajorVersion)
-{
-  std::string rccExec;
-  std::string err;
-
-  cmLocalGenerator* localGen = target->GetLocalGenerator();
-  if (qtMajorVersion == "5") {
-    cmGeneratorTarget* tgt = localGen->FindGeneratorTargetToUse("Qt5::rcc");
-    if (tgt != nullptr) {
-      rccExec = SafeString(tgt->ImportedGetLocation(""));
-    } else {
-      err = "AUTORCC: Qt5::rcc target not found";
-    }
-  } else if (qtMajorVersion == "4") {
-    cmGeneratorTarget* tgt = localGen->FindGeneratorTargetToUse("Qt4::rcc");
-    if (tgt != nullptr) {
-      rccExec = SafeString(tgt->ImportedGetLocation(""));
-    } else {
-      err = "AUTORCC: Qt4::rcc target not found";
-    }
-  } else {
-    err = "The AUTORCC feature supports only Qt 4 and Qt 5";
-  }
-
-  if (!err.empty()) {
-    err += " (";
-    err += target->GetName();
-    err += ")";
-    cmSystemTools::Error(err.c_str());
-  }
-  return rccExec;
-}
-
 cmQtAutoGeneratorInitializer::cmQtAutoGeneratorInitializer(
   cmGeneratorTarget* target, bool mocEnabled, bool uicEnabled, bool rccEnabled,
   std::string const& qtVersionMajor)
@@ -368,6 +335,56 @@ void cmQtAutoGeneratorInitializer::InitCustomTargets()
     this->Target->AddIncludeDirectory(includeDir, true);
   }
 
+  // Acquire rcc executable and features
+  if (this->RccEnabled) {
+    {
+      std::string err;
+      if (this->QtVersionMajor == "5") {
+        cmGeneratorTarget* tgt =
+          localGen->FindGeneratorTargetToUse("Qt5::rcc");
+        if (tgt != nullptr) {
+          this->RccExecutable = SafeString(tgt->ImportedGetLocation(""));
+        } else {
+          err = "AUTORCC: Qt5::rcc target not found";
+        }
+      } else if (QtVersionMajor == "4") {
+        cmGeneratorTarget* tgt =
+          localGen->FindGeneratorTargetToUse("Qt4::rcc");
+        if (tgt != nullptr) {
+          this->RccExecutable = SafeString(tgt->ImportedGetLocation(""));
+        } else {
+          err = "AUTORCC: Qt4::rcc target not found";
+        }
+      } else {
+        err = "The AUTORCC feature supports only Qt 4 and Qt 5";
+      }
+      if (!err.empty()) {
+        err += " (";
+        err += this->Target->GetName();
+        err += ")";
+        cmSystemTools::Error(err.c_str());
+      }
+    }
+    // Detect if rcc supports (-)-list
+    if (!this->RccExecutable.empty() && (this->QtVersionMajor == "5")) {
+      std::vector<std::string> command;
+      command.push_back(this->RccExecutable);
+      command.push_back("--help");
+      std::string rccStdOut;
+      std::string rccStdErr;
+      int retVal = 0;
+      bool result = cmSystemTools::RunSingleCommand(
+        command, &rccStdOut, &rccStdErr, &retVal, nullptr,
+        cmSystemTools::OUTPUT_NONE, 0.0, cmProcessOutput::Auto);
+      if (result && retVal == 0 &&
+          rccStdOut.find("--list") != std::string::npos) {
+        this->RccListOptions.push_back("--list");
+      } else {
+        this->RccListOptions.push_back("-list");
+      }
+    }
+  }
+
   // Extract relevant source files
   std::vector<std::string> generatedSources;
   std::vector<std::string> generatedHeaders;
@@ -548,8 +565,6 @@ void cmQtAutoGeneratorInitializer::InitCustomTargets()
   // Process qrc files
   if (!this->Qrcs.empty()) {
     const bool QtV5 = (this->QtVersionMajor == "5");
-    std::string const rcc =
-      RccGetExecutable(this->Target, this->QtVersionMajor);
     // Target rcc options
     std::vector<std::string> optionsTarget;
     cmSystemTools::ExpandListArgument(
@@ -673,9 +688,9 @@ void cmQtAutoGeneratorInitializer::InitCustomTargets()
           // Add the resource files to the dependencies
           {
             std::string error;
-            if (cmQtAutoGen::RccListInputs(this->QtVersionMajor, rcc,
-                                           qrc.QrcFile, qrc.Resources,
-                                           &error)) {
+            if (cmQtAutoGen::RccListInputs(this->RccExecutable,
+                                           this->RccListOptions, qrc.QrcFile,
+                                           qrc.Resources, &error)) {
               for (std::string const& fileName : qrc.Resources) {
                 // Add resource file to the custom command dependencies
                 ccDepends.push_back(fileName);
@@ -881,8 +896,9 @@ void cmQtAutoGeneratorInitializer::SetupCustomTargets()
     }
   }
   if (this->RccEnabled) {
-    AddDefinitionEscaped(makefile, "_qt_rcc_executable",
-                         RccGetExecutable(this->Target, this->QtVersionMajor));
+    AddDefinitionEscaped(makefile, "_qt_rcc_executable", this->RccExecutable);
+    AddDefinitionEscaped(makefile, "_qt_rcc_list_options",
+                         this->RccListOptions);
   }
 
   // Create info directory on demand
diff --git a/Source/cmQtAutoGeneratorInitializer.h b/Source/cmQtAutoGeneratorInitializer.h
index 9eebbd6..e06e1c4 100644
--- a/Source/cmQtAutoGeneratorInitializer.h
+++ b/Source/cmQtAutoGeneratorInitializer.h
@@ -65,8 +65,11 @@ private:
   bool MocEnabled;
   bool UicEnabled;
   bool RccEnabled;
+  // Qt
   std::string QtVersionMajor;
   std::string QtVersionMinor;
+  std::string RccExecutable;
+  std::vector<std::string> RccListOptions;
   // Configurations
   std::string ConfigDefault;
   std::vector<std::string> ConfigsList;
diff --git a/Source/cmQtAutoGeneratorRcc.cxx b/Source/cmQtAutoGeneratorRcc.cxx
index 573f04c..3c9f1a8 100644
--- a/Source/cmQtAutoGeneratorRcc.cxx
+++ b/Source/cmQtAutoGeneratorRcc.cxx
@@ -78,8 +78,8 @@ bool cmQtAutoGeneratorRcc::InfoFileRead(cmMakefile* makefile)
   this->AutogenBuildDir = InfoGet("ARCC_BUILD_DIR");
 
   // - Qt environment
-  this->QtMajorVersion = InfoGet("ARCC_QT_VERSION_MAJOR");
-  this->RccExecutable = InfoGet("ARCC_QT_RCC_EXECUTABLE");
+  this->RccExecutable = InfoGet("ARCC_RCC_EXECUTABLE");
+  this->RccListOptions = InfoGetList("ARCC_RCC_LIST_OPTIONS");
 
   // - Job
   this->QrcFile = InfoGet("ARCC_SOURCE");
@@ -135,6 +135,8 @@ void cmQtAutoGeneratorRcc::SettingsFileRead(cmMakefile* makefile)
       std::string str;
       str += this->RccExecutable;
       str += sep;
+      str += cmJoin(this->RccListOptions, ";");
+      str += sep;
       str += this->QrcFile;
       str += sep;
       str += this->RccFile;
@@ -307,7 +309,7 @@ bool cmQtAutoGeneratorRcc::RccGenerate()
     } else {
       // Read input file list from qrc file
       std::string error;
-      if (cmQtAutoGen::RccListInputs(this->QtMajorVersion, this->RccExecutable,
+      if (cmQtAutoGen::RccListInputs(this->RccExecutable, this->RccListOptions,
                                      this->QrcFile, readFiles, &error)) {
         files = &readFiles;
       } else {
diff --git a/Source/cmQtAutoGeneratorRcc.h b/Source/cmQtAutoGeneratorRcc.h
index 804d117..0e3f690 100644
--- a/Source/cmQtAutoGeneratorRcc.h
+++ b/Source/cmQtAutoGeneratorRcc.h
@@ -44,8 +44,8 @@ private:
   std::string AutogenBuildDir;
   cmFilePathChecksum FilePathChecksum;
   // -- Qt environment
-  std::string QtMajorVersion;
   std::string RccExecutable;
+  std::vector<std::string> RccListOptions;
   // -- Job
   std::string QrcFile;
   std::string RccFile;