CMakePresets.json: Don't warn if no path argument is given

If --preset is specified with no path argument, use the current
directory as the source directory, the preset's binaryDir as the
binary directory, and don't issue the standard warning for no path
specified.

Fixes: #21386

Source/cmake.cxx

@@ -1005,9 +1005,15 @@ void cmake::SetArgs(const std::vector<std::string>& args)
 
   const bool haveSourceDir = !this->GetHomeDirectory().empty();
   const bool haveBinaryDir = !this->GetHomeOutputDirectory().empty();
+  const bool havePreset =
+#ifdef CMAKE_BOOTSTRAP
+    false;
+#else
+    !presetName.empty();
+#endif
 
   if (this->CurrentWorkingMode == cmake::NORMAL_MODE && !haveSourceDir &&
-      !haveBinaryDir) {
+      !haveBinaryDir && !havePreset) {
     this->IssueMessage(
       MessageType::WARNING,
       "No source or binary directory provided. Both will be assumed to be "

Tests/RunCMake/CMakePresets/CMakePresets.json.in

@@ -169,6 +169,11 @@
       "generator": "@RunCMake_GENERATOR@",
       "binaryDir": "${sourceDir}/build"
     },
+    {
+      "name": "GoodNoSourceArg",
+      "generator": "@RunCMake_GENERATOR@",
+      "binaryDir": "${sourceDir}/build"
+    },
     {
       "name": "GoodInheritanceParentBase",
       "hidden": true,

Tests/RunCMake/CMakePresets/GoodNoSourceArg.cmake

@@ -0,0 +1,3 @@
+include(${CMAKE_CURRENT_LIST_DIR}/TestVariable.cmake)
+
+test_variable(CMAKE_BINARY_DIR "" "${CMAKE_SOURCE_DIR}/build")

Tests/RunCMake/CMakePresets/RunCMakeTest.cmake

@@ -179,6 +179,13 @@ unset(RunCMake_TEST_NO_CLEAN)
 unset(CMakePresets_SOURCE_ARG)
 unset(RunCMake_TEST_BINARY_DIR)
 unset(CMakePresets_NO_S_ARG)
+set(CMakePresets_NO_SOURCE_ARGS 1)
+set(RunCMake_TEST_BINARY_DIR "${RunCMake_BINARY_DIR}/GoodNoSourceArg")
+set(RunCMake_TEST_NO_CLEAN 1)
+run_cmake_presets(GoodNoSourceArg)
+unset(RunCMake_TEST_NO_CLEAN)
+unset(RunCMake_TEST_BINARY_DIR)
+unset(CMakePresets_NO_SOURCE_ARGS)
 run_cmake_presets(GoodInheritanceParent)
 run_cmake_presets(GoodInheritanceChild)
 run_cmake_presets(GoodInheritanceOverride)