Autogen: Move libuv loop from cmQtAutoGenerator to cmQtAutoGeneratorMocUic

`cmQtAutoGenerator` automatically started a libuv loop in the constructor.
The loop is needed in `cmQtAutoGeneratorMocUic`, but not in
`cmQtAutoGeneratorRcc` (anymore).  To avoid starting the loop in
`cmQtAutoGeneratorRcc`, this patch moves the loop variables and startup code
from `cmQtAutoGenerator` to `cmQtAutoGeneratorMocUic`.

Source/cmQtAutoGenerator.cxx

@@ -657,22 +657,9 @@ void cmQtAutoGenerator::ReadOnlyProcessT::UVTryFinish()
   }
 }
 
-cmQtAutoGenerator::cmQtAutoGenerator()
-{
-  // Initialize libuv loop
-  uv_disable_stdio_inheritance();
-#ifdef CMAKE_UV_SIGNAL_HACK
-  UVHackRAII_ = cm::make_unique<cmUVSignalHackRAII>();
-#endif
-  UVLoop_ = cm::make_unique<uv_loop_t>();
-  uv_loop_init(UVLoop());
-}
+cmQtAutoGenerator::cmQtAutoGenerator() = default;
 
-cmQtAutoGenerator::~cmQtAutoGenerator()
-{
-  // Close libuv loop
-  uv_loop_close(UVLoop());
-}
+cmQtAutoGenerator::~cmQtAutoGenerator() = default;
 
 bool cmQtAutoGenerator::Run(std::string const& infoFile,
                             std::string const& config)

Source/cmQtAutoGenerator.h

@@ -8,7 +8,6 @@
 #include "cmFilePathChecksum.h"
 #include "cmQtAutoGen.h"
 #include "cmUVHandlePtr.h"
-#include "cmUVSignalHackRAII.h" // IWYU pragma: keep
 #include "cm_uv.h"
 
 #include <array>
@@ -249,9 +248,6 @@ public:
   std::string const& InfoFile() const { return InfoFile_; }
   std::string const& InfoDir() const { return InfoDir_; }
   std::string const& InfoConfig() const { return InfoConfig_; }
-  // libuv loop
-  uv_loop_t* UVLoop() { return UVLoop_.get(); }
-  cm::uv_async_ptr& UVRequest() { return UVRequest_; }
 
   // -- Utility
   static std::string SettingsFind(std::string const& content, const char* key);
@@ -266,12 +262,6 @@ private:
   std::string InfoFile_;
   std::string InfoDir_;
   std::string InfoConfig_;
-// -- libuv loop
-#ifdef CMAKE_UV_SIGNAL_HACK
-  std::unique_ptr<cmUVSignalHackRAII> UVHackRAII_;
-#endif
-  std::unique_ptr<uv_loop_t> UVLoop_;
-  cm::uv_async_ptr UVRequest_;
 };
 
 #endif

Source/cmQtAutoGeneratorMocUic.cxx

@@ -1148,11 +1148,23 @@ cmQtAutoGeneratorMocUic::cmQtAutoGeneratorMocUic()
   Uic_.RegExpInclude.compile("(^|\n)[ \t]*#[ \t]*include[ \t]+"
                              "[\"<](([^ \">]+/)?ui_[^ \">/]+\\.h)[\">]");
 
+  // Initialize libuv loop
+  uv_disable_stdio_inheritance();
+#ifdef CMAKE_UV_SIGNAL_HACK
+  UVHackRAII_ = cm::make_unique<cmUVSignalHackRAII>();
+#endif
+  UVLoop_ = cm::make_unique<uv_loop_t>();
+  uv_loop_init(UVLoop());
+
   // Initialize libuv asynchronous iteration request
   UVRequest().init(*UVLoop(), &cmQtAutoGeneratorMocUic::UVPollStage, this);
 }
 
-cmQtAutoGeneratorMocUic::~cmQtAutoGeneratorMocUic() = default;
+cmQtAutoGeneratorMocUic::~cmQtAutoGeneratorMocUic()
+{
+  // Close libuv loop
+  uv_loop_close(UVLoop());
+}
 
 bool cmQtAutoGeneratorMocUic::Init(cmMakefile* makefile)
 {

Source/cmQtAutoGeneratorMocUic.h

@@ -8,6 +8,7 @@
 #include "cmQtAutoGen.h"
 #include "cmQtAutoGenerator.h"
 #include "cmUVHandlePtr.h"
+#include "cmUVSignalHackRAII.h" // IWYU pragma: keep
 #include "cm_uv.h"
 #include "cmsys/RegularExpression.hxx"
 
@@ -390,6 +391,9 @@ private:
   // -- Utility accessors
   Logger& Log() { return Logger_; }
   FileSystem& FileSys() { return FileSys_; }
+  // -- libuv loop accessors
+  uv_loop_t* UVLoop() { return UVLoop_.get(); }
+  cm::uv_async_ptr& UVRequest() { return UVRequest_; }
   // -- Abstract processing interface
   bool Init(cmMakefile* makefile) override;
   bool Process() override;
@@ -417,7 +421,12 @@ private:
   BaseSettingsT Base_;
   MocSettingsT Moc_;
   UicSettingsT Uic_;
-  // -- Progress
+  // -- libuv loop
+#ifdef CMAKE_UV_SIGNAL_HACK
+  std::unique_ptr<cmUVSignalHackRAII> UVHackRAII_;
+#endif
+  std::unique_ptr<uv_loop_t> UVLoop_;
+  cm::uv_async_ptr UVRequest_;
   StageT Stage_ = StageT::SETTINGS_READ;
   // -- Job queues
   std::mutex JobsMutex_;