QtAutogen: Process 'rcc --list' stdout and stderr separately (#15523)

The stderr may have warning messages.  We should not treat these lines
as resource files.  However, we must still recognize error message lines
for missing resource files that may be generated.

Extend the QtAutogen test to cover a generated resource as the only one
listed in a .qrc file.  This causes 'rcc --list' to print a warning to
stderr that we now intend to ignore.

Source/cmQtAutoGenerators.cxx

@@ -197,48 +197,56 @@ std::string cmQtAutoGenerators::ListQt5RccInputs(cmSourceFile* sf,
 
   command.push_back(absFile);
 
-  std::string output;
+  std::string rccStdOut;
+  std::string rccStdErr;
   int retVal = 0;
-  bool result = cmSystemTools::RunSingleCommand(command, &output, &output,
-                                            &retVal, 0,
-                                            cmSystemTools::OUTPUT_NONE);
+  bool result = cmSystemTools::RunSingleCommand(
+    command, &rccStdOut, &rccStdErr,
+    &retVal, 0, cmSystemTools::OUTPUT_NONE);
   if (!result || retVal)
     {
     std::cerr << "AUTOGEN: error: Rcc list process for " << sf->GetFullPath()
-              << " failed:\n" << output << std::endl;
+              << " failed:\n" << rccStdOut << "\n" << rccStdErr << std::endl;
     return std::string();
     }
 
-  std::istringstream ostr(output);
+  {
+  std::istringstream ostr(rccStdOut);
   std::string oline;
   while(std::getline(ostr, oline))
     {
     oline = cmQtAutoGeneratorsStripCR(oline);
-    if (oline.empty())
+    if(!oline.empty())
       {
-      // The output of rcc --list contains many empty lines.
-      continue;
+      qrcEntries.push_back(oline);
       }
-    if (cmHasLiteralPrefix(oline, "RCC: Error in"))
+    }
+  }
+
+  {
+  std::istringstream estr(rccStdErr);
+  std::string eline;
+  while(std::getline(estr, eline))
+    {
+    eline = cmQtAutoGeneratorsStripCR(eline);
+    if (cmHasLiteralPrefix(eline, "RCC: Error in"))
       {
       static std::string searchString = "Cannot find file '";
 
-      std::string::size_type pos = oline.find(searchString);
+      std::string::size_type pos = eline.find(searchString);
       if (pos == std::string::npos)
         {
         std::cerr << "AUTOGEN: error: Rcc lists unparsable output "
-                  << oline << std::endl;
+                  << eline << std::endl;
         return std::string();
         }
       pos += searchString.length();
-      std::string::size_type sz = oline.size() - pos - 1;
-      qrcEntries.push_back(oline.substr(pos, sz));
-      }
-    else
-      {
-      qrcEntries.push_back(oline);
+      std::string::size_type sz = eline.size() - pos - 1;
+      qrcEntries.push_back(eline.substr(pos, sz));
       }
     }
+  }
+
   depends.insert(depends.end(), qrcEntries.begin(), qrcEntries.end());
   return cmJoin(qrcEntries, "@list_sep@");
 }

Tests/QtAutogen/CMakeLists.txt

@@ -63,7 +63,15 @@ add_library(codeeditorLib STATIC codeeditor.cpp)
 
 add_library(privateSlot OBJECT private_slot.cpp)
 
+configure_file(generated_resource.qrc.in generated_resource.qrc @ONLY)
+add_custom_command(
+  OUTPUT generated.txt
+  COMMAND ${CMAKE_COMMAND} -E copy "${CMAKE_CURRENT_SOURCE_DIR}/generated.txt.in" "${CMAKE_CURRENT_BINARY_DIR}/generated.txt"
+  DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/generated.txt.in"
+  )
+
 add_custom_target(generate_moc_input
+  DEPENDS generated.txt
   COMMAND ${CMAKE_COMMAND} -E copy "${CMAKE_CURRENT_SOURCE_DIR}/myinterface.h.in" "${CMAKE_CURRENT_BINARY_DIR}"
   COMMAND ${CMAKE_COMMAND} -E rename "${CMAKE_CURRENT_BINARY_DIR}/myinterface.h.in" "${CMAKE_CURRENT_BINARY_DIR}/myinterface.h"
 )
@@ -89,6 +97,7 @@ add_executable(QtAutogen main.cpp calwidget.cpp second_widget.cpp foo.cpp blub.c
                multiplewidgets.cpp
                xyz.cpp yaf.cpp gadget.cpp $<TARGET_OBJECTS:privateSlot>
                test.qrc second_resource.qrc resourcetester.cpp generated.cpp ${debug_srcs}
+               ${CMAKE_CURRENT_BINARY_DIR}/generated_resource.qrc
 )
 set_property(TARGET QtAutogen APPEND PROPERTY AUTOGEN_TARGET_DEPENDS generate_moc_input "${CMAKE_CURRENT_BINARY_DIR}/myotherinterface.h")
 

Tests/QtAutogen/generated.txt.in

@@ -0,0 +1 @@
+Some generated text file.

Tests/QtAutogen/generated_resource.qrc.in

@@ -0,0 +1,5 @@
+<!DOCTYPE RCC><RCC version="1.0">
+<qresource>
+    <file>generated.txt</file>
+</qresource>
+</RCC>