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  VS Arduino › Visual Micro › Installation & Troubleshooting › Link error with optimization turned off on Portenta H7
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Normal Topic Link error with optimization turned off on Portenta H7 (Read 1625 times)
YW50
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Link error with optimization turned off on Portenta H7
Sep 21st, 2022 at 5:53pm
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Building the project with "No optimization" produces an error. "Default optimization" is ok. Full log is attached.

Error linking for board Arduino Portenta H7 (M7 core)                                                                                          (envie_m7)
core.a(USBCDC.cpp.o)*: In function arduino::internal:TongueluggableUSBModule:TongueluggableUSBModule(unsigned char)
Build failed for project 'P3ModuleArduino'
PluggableUSBDevice.h:40: undefined reference to vtable for arduino  internal  PluggableUSBModule
  
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Tim@Visual Micro
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Re: Link error with optimization turned off on Portenta H7
Reply #1 - Sep 21st, 2022 at 6:50pm
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Some cores support it some do not. Visual Micro can't control or know the outcome, it can only allow you to specify the gcc compiler flags. After that it is up to the design of the core you are using.

A lot of cores struggle with no optimization.
  
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YW50
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Re: Link error with optimization turned off on Portenta H7
Reply #2 - Sep 21st, 2022 at 7:13pm
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Thank you.
  
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