Suggestions from bdring, added build-all scripts

build-all.ps1

@@ -0,0 +1,34 @@
+# This Windows PowerShell script uses PlatformIO to compile Grbl_ESP32
+# for every machine configuration in the Machines/ directory.
+# It is useful for automated testing.
+
+# Setting PYTHONIOENCODING avoids an obscure crash related to code page mismatch
+$env:PYTHONIOENCODING="utf-8"
+$envsave = $env:PLATFORMIO_BUILD_FLAGS
+
+Function BuildMachine($names) {
+     $basename = $names[0]
+     $addname = $names[1]
+     $env:PLATFORMIO_BUILD_FLAGS = "-DMACHINE_FILENAME=$basename"
+     $displayname = $basename
+     if ($addname -ne "") {
+          $env:PLATFORMIO_BUILD_FLAGS += " -DMACHINE_FILENAME2=$addname"
+          $displayname += " + $addname"
+      }
+     Write-Output "Building machine $displayname"
+     platformio run 2>&1 | Select-String error,Took
+     Write-Output " "
+}
+
+# First build all the base configurations with names that do not start with add_
+foreach ($filepath in Get-ChildItem -file .\Grbl_Esp32\Machines\* -Exclude add_*) {
+     BuildMachine($filepath.name, "")
+}
+
+# Then build all of the add-ons on top of a single base
+$base="3axis_v4.h"
+foreach ($filepath in Get-ChildItem -file .\Grbl_Esp32\Machines\add_*) {
+     BuildMachine($base, $filepath.name)
+}
+
+$env:PLATFORMIO_BUILD_FLAGS=$envsave