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Error in Release Mode Build: "unterminated variable reference" in subdir.mk

meghasb
Senior

‎2025-06-04 11:37 PM

Hi all,

I'm facing an issue while building my STM32 project in Release mode, but everything compiles fine in Debug mode.

The following error appears during the Release build:
Middlewares/usbx/UX_Network_Driver/subdir.mk:19: *** unterminated variable reference. Stop.
make: *** [makefile:85: all] Error 2

There are no issues in any of the other source or header files. This only occurs in the subdir.mk under the USBX network driver middleware.

I would like to understand:

  • What could be the root cause of this error?

  • Why it occurs only in Release mode and not in Debug mode?

  • What steps can I take to resolve this?

Any guidance or suggestions would be greatly appreciated.

Thanks in advance!

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Saket_Om
ST Employee

‎2025-06-18 6:44 AM

Hello @meghasb 

Did you clean before re-build in release mode?

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Saket_Om
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