QtDialog: Clean up and document -S and -B options

Help/manual/cmake-gui.1.rst

@@ -10,6 +10,7 @@ Synopsis
 
  cmake-gui [<options>]
  cmake-gui [<options>] {<path-to-source> | <path-to-existing-build>}
+ cmake-gui [<options>] -S <path-to-source> -B <path-to-build>
 
 Description
 ===========
@@ -27,6 +28,14 @@ native tool on their platform.
 Options
 =======
 
+``-S <path-to-source>``
+ Path to root directory of the CMake project to build.
+
+``-B <path-to-build>``
+ Path to directory which CMake will use as the root of build directory.
+
+ If the directory doesn't already exist CMake will make it.
+
 .. include:: OPTIONS_HELP.txt
 
 See Also

Help/release/dev/cmake-gui-s-b.rst

@@ -0,0 +1,5 @@
+cmake-gui-s-b
+-------------
+
+* The :manual:`cmake-gui(1)` dialog gained new ``-S`` and ``-B`` arguments to
+  explicitly specify source and build directories.