Compile error with SKEW_CORRECTION

[DaveAhrendt]

Compiling with Arduino IDE 1.9.0-beta and Marlin bugfix 2.0 from 12/6. Was running well and decided to see what skew correction was about. Just enabling #define SKEW_CORRECTION with default values causes a compile error or more likely a linker error.

C:\Users\Dave\AppData\Local\Temp\ccWPadut.ltrans8.ltrans.o: In function `MarlinSettings::save()':
ccWPadut.ltrans8.o:(.text+0x706): undefined reference to `Planner::xy_skew_factor'
ccWPadut.ltrans8.o:(.text+0x708): undefined reference to `Planner::xy_skew_factor'
ccWPadut.ltrans8.o:(.text+0x71e): undefined reference to `Planner::xz_skew_factor'
ccWPadut.ltrans8.o:(.text+0x720): undefined reference to `Planner::xz_skew_factor'
ccWPadut.ltrans8.o:(.text+0x736): undefined reference to `Planner::yz_skew_factor'
ccWPadut.ltrans8.o:(.text+0x738): undefined reference to `Planner::yz_skew_factor'
collect2.exe: error: ld returned 1 exit status
Using library U8glib at version 1.19.1 in folder: C:\Users\Dave\Documents\Arduino\libraries\U8glib 
exit status 1
Error compiling for board Arduino/Genuino Mega or Mega 2560.

Further information: Using the default config. files from the .zip file things compile OK with skew_correction enabled. Using the Folger I3-2020 (changed to use BOARD_RAMPS_14_EFB for motherboard) I get the compile error with skew_correction enabled. Tried with UBL disabled - same error.

[PolloPequeno]

Just a heads up that Skew isn't working with UBL enabled (I'm using 1.1.X_bugfix and it's compiling fine). See #8632

[thinkyhead]

The issue shown here should now be fixed. A fix for skew with UBL is pending at #8729

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