attempt to use a runtime with tclkit capability as fallback for tclkit for sdx when tclkit/sdx not available as executables

src/make.tcl

@@ -2446,6 +2446,16 @@ set rtfolder $binfolder/runtime/$rt_os_arch
 set rt_sourcefolder $sourcefolder/runtime ;#where our config lives
 #review - when building kits for other platforms - it's unlikely runtime will be marked as executable - we should probably process all files in runtime folder except those with certain extensions
 
+proc ::punkboot::lib::runtime_buildcopyname {runtime} {
+    if {$::tcl_platform(platform) eq "windows"} {
+        set rtname [file rootname [file tail $runtime]]
+        set bcname ${rtname}_BUILDCOPY.exe
+    } else {
+        set rtname [file tail $runtime]
+        set bcname ${rtname}_BUILDCOPY
+    }
+    return $bcname
+}
 
 set runtimes [list]
 if {[file dirname [info nameofexecutable]] eq $rtfolder} {
@@ -2453,9 +2463,11 @@ if {[file dirname [info nameofexecutable]] eq $rtfolder} {
     # - when the current runtime is using a runtime in the rtfolder that is a tclkit, it is mounted at the same path as the physical file and so appears to Tcl as if it's a directory.
     # - use external filesystem tools to make a copy of the file
     if {$::tcl_platform(platform) eq "windows"} {
-        exec cmd /c copy [info nameofexecutable] $rtfolder/[file rootname [file tail [info nameofexecutable]]]_BUILDCOPY.exe
+        #exec cmd /c copy [info nameofexecutable] $rtfolder/[file rootname [file tail [info nameofexecutable]]]_BUILDCOPY.exe
+        exec cmd /c copy [info nameofexecutable] $rtfolder/[punkboot::lib::runtime_buildcopyname [info nameofexecutable]]
     } else {
-        exec cp [info nameofexecutable] $rtfolder/[file tail [info nameofexecutable]]_BUILDCOPY
+        #exec cp [info nameofexecutable] $rtfolder/[file tail [info nameofexecutable]]_BUILDCOPY
+        exec cp [info nameofexecutable] $rtfolder/[punkboot::lib::runtime_buildcopyname [info nameofexecutable]]
     }
     lappend runtimes [file tail [info nameofexecutable]]
 }
@@ -2491,13 +2503,34 @@ if {$sdxpath eq ""} {
         set sdxpath [auto_execok sdx]
     }
     if {$sdxpath eq ""} {
-        #last resort - a tclkit and sdx.kit fine
+        #last resorts - a tclkit and sdx.kit file
         if {[file exists $binfolder/sdx.kit]} {
             set tclkitpath [auto_execok $binfolder/tclkit]
             if {$tclkitpath eq ""} {
                 set tclkitpath [auto_execok tclkit]
             }
+            if {$tclkitpath ne ""} {
                 set sdxpath [list {*}$tclkitpath $binfolder/sdx.kit]
+            } else {
+                #see if the runtime (or any runtime *for current platform*) has tclkit in the name or has_starkit(?) and use that
+                #todo - review
+                #picking first found for now - fix
+                dict for {rtname rtprops} $runtime_caps {
+                    if {[dict exists $rtprops has_starkit] && [dict get $rtprops has_starkit]} {
+                        set testpath $rtfolder/$rtname
+                        if {[file exists $testpath]} {
+                            if {[file type $testpath] eq "directory"} {
+                                set tclkitpath $rtfolder/[punk::lib::runtime_buildcopyname $testpath]
+                            } else {
+                                set tclkitpath $testpath
+                            }
+                            if {$tclkitpath ne "" && [file exists $tclkitpath]} {
+                                break
+                            }
+                        }
+                    }
+                }
+            }
         }
     }