[BUG] Compile of G61.cpp fails with zero extruders

[Kramax]

Did you test the latest bugfix-2.1.x code?

Yes, and the problem still exists.

Bug Description

Compilation of the unit G61.cpp fails if no extruders are configured. This is because a single line of code is not surrounded by the " #if HAS_EXTRUDERS" cpp command. The function GcodeSuite::G61() has this line:
float epos = stored_position[slot].e;
which needs to have the guard of HAS_EXTRUDERS.

Bug Timeline

New bug introduced on July 26, 2024 by commit 78e111a for issue #27281.

Expected behavior

I expect the compile to succeed when no extruders are defined.

Actual behavior

The compile fails with unknown symbols since the "e" field of the saved position struct is missing.

Steps to Reproduce

1. Create a Configuration.h with EXTRUDERS defined to be 0.
2. Make sure SAVED_POSITIONS in Configuration_adv.h is greater than 0.
3. Try to build
4. The build fails

Version of Marlin Firmware

Bugfix-2.1.x

Printer model

NA

Electronics

BTT Octopus V1.1

LCD/Controller

None

Other add-ons

None

Bed Leveling

None

Your Slicer

None

Host Software

None

Don't forget to include

• A ZIP file containing your Configuration.h and Configuration_adv.h.

Additional information & file uploads

Configuration.zip

[Kramax]

This can be fixed with this patch:

diff --git a/Marlin/src/gcode/feature/pause/G61.cpp b/Marlin/src/gcode/feature/pause/G61.cpp
index 08b4a99b7d..c4d385b4ae 100644
--- a/Marlin/src/gcode/feature/pause/G61.cpp
+++ b/Marlin/src/gcode/feature/pause/G61.cpp
@@ -75,7 +75,10 @@ void GcodeSuite::G61(int8_t slot/*=-1*/) {

   // No XYZ...E parameters, move to stored position

+  #if HAS_EXTRUDERS
   float epos = stored_position[slot].e;
+  #endif
+
   if (!parser.seen_axis()) {
     DEBUG_ECHOLNPGM(STR_RESTORING_POSITION, slot, " (all axes)");
     // Move to the saved position, all axes except E

[ellensp]

PR created