QtAutogen: Workaround rcc CRCRLF newlines on Windows (#15459)

The 'rcc --list' operation may print newlines of the form CRCRLF,
so strip any trailing CR characters found on each line.

Update the Tests/QtAutogen test to use a resource named in a
subdirectory.  This causes 'rcc --list' to display a blank line
and tests that it is correctly filtered out.

Source/cmQtAutoGenerators.cxx

@@ -201,6 +201,13 @@ std::string cmQtAutoGenerators::ListQt5RccInputs(cmSourceFile* sf,
   std::string oline;
   while(std::getline(ostr, oline))
     {
+    // Strip CR characters rcc may have printed (possibly more than one!).
+    std::string::size_type cr = oline.find('\r');
+    if (cr != oline.npos)
+      {
+      oline = oline.substr(0, cr);
+      }
+
     if (oline.empty())
       {
       // The output of rcc --list contains many empty lines.

Tests/QtAutogen/CMakeLists.txt

@@ -147,7 +147,7 @@ set(timeformat "%Y%j%H%M%S")
 file(TIMESTAMP "${qrc_file1}" file1_before "${timeformat}")
 
 execute_process(COMMAND "${CMAKE_COMMAND}" -E sleep 1) # Ensure that the timestamp will change.
-execute_process(COMMAND "${CMAKE_COMMAND}" -E touch "${CMAKE_CURRENT_BINARY_DIR}/autorcc_depends/res1_input.txt")
+execute_process(COMMAND "${CMAKE_COMMAND}" -E touch "${CMAKE_CURRENT_BINARY_DIR}/autorcc_depends/res1/input.txt")
 
 execute_process(COMMAND "${CMAKE_COMMAND}" --build .
   WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/autorcc_depends"

Tests/QtAutogen/autorcc_depends/CMakeLists.txt

@@ -16,7 +16,7 @@ else()
 endif()
 
 configure_file(res1.qrc.in res1.qrc @ONLY)
-configure_file(res1_input.txt.in res1_input.txt @ONLY)
+configure_file(res1/input.txt.in res1/input.txt @ONLY)
 
 add_executable(test_res1
   test_res1.cpp

Tests/QtAutogen/autorcc_depends/res1.qrc.in

@@ -1,5 +1,5 @@
 <RCC>
     <qresource prefix="/">
-        <file>res1_input.txt</file>
+        <file>res1/input.txt</file>
     </qresource>
 </RCC>