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  VS Arduino › Visual Micro › Installation & Troubleshooting › collect2.exe / error creating .elf
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Locked Topic collect2.exe / error creating .elf (Read 4625 times)
Bob Jones
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collect2.exe / error creating .elf
Dec 12th, 2015 at 7:00am
 
I have seen many posts referencing "collect2.exe" or the .elf file, but I haven't seen any answers that worked for my installation. I did learn that if I set Release mode, it does upload the code to the device. So my entire compiler out boils down to this:

Compiling debug version of 'Rover' for 'Arduino/Genuino Mega w/ ATmega2560 (Mega 2560)'
Build folder: file:///C:/Users/Bob/AppData/Local/V.Micro/Arduino/Builds/Rover/mega_atmega2560
BJDualMotor.cpp.o:(.bss.__VisualMicro_GlobalLastMillis__+0x0): multiple definition of `__VisualMicro_GlobalLastMillis__
BJDetector.cpp.o:(.bss.__VisualMicro_GlobalLastMillis__+0x0): first defined here
ld.exe:Disabling relaxation: it will not work with multiple definitions
collect2.exe*:error: ld returned 1 exit status
Error creating .elf
My code has four libraries. BJDualMotor and BJDetector are two of them. 

I need advice on how to debug this. Cry
« Last Edit: Dec 12th, 2015 at 7:00am by Bob Jones »  
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Tim@Visual Micro
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Re: collect2.exe / error creating .elf
Reply #1 - Dec 12th, 2015 at 1:20pm
 
Hi Bob,

Please zip and email the folder sown in the output to info[at]visualmicro.com

Are the libraries local sketch libraries or installed in document/arduino/libraries?

Thanks
« Last Edit: Dec 12th, 2015 at 11:24pm by Tim@Visual Micro »  
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Bob Jones
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Re: collect2.exe / error creating .elf
Reply #2 - Dec 14th, 2015 at 1:02am
 
I just sent you a ZIP file with my problem project ("Rover") and my libraries folder from my Arduino Projects folder. I hope you can help me jump over this particular hurdle... I am truly stuck.

I also attached the zip file to this post but this attachment is only my code and the output.log and errors.txt (created these from the screen output). 

Thanks... Undecided
  
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Tim@Visual Micro
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Re: collect2.exe / error creating .elf
Reply #3 - Dec 14th, 2015 at 3:06am
 
Thanks for the info. There is a  bug fix that should solve this in the latest visual micro update via "tools>extensions and updates".

It was a result of having two breakpoints in two different .cpp source files that both had a millis based "HitCount"  "Condition"

The error was actually this:-

BJDualMotor.cpp.o:(.bss.__VisualMicro_GlobalLastMillis__+0x0): multiple definition of `__VisualMicro_GlobalLastMillis__
BJDetector.cpp.o:(.bss.__VisualMicro_GlobalLastMillis__+0x0): first defined here

The Arduino tool chains often produce the final meaningless "collect2.exe*:error". Visual micro just displays what is returned from the toolchain.exe


tip:

Thanks for the report it was useful, good to see someone making use of the new local library edit/debug facility. Don't forget you can use the toolbar to switch between "Debug/Release" which also would have solved the issue and proven it to be related to debug build.
  
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Bob Jones
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Re: collect2.exe / error creating .elf
Reply #4 - Dec 14th, 2015 at 7:33am
 
The update fixed the problem. Thanks. 

As I mentioned, I have been a programmer since the bits were rectangular. I am working to build a collection of libraries that support my playing with robots. I am doing this strictly for fun (my day job is PHP/Drupal 6), but I spent 13 years with Visual Studio and C# writing full stack websites (JQuery...LINK). I understand bugs and fixing them. I do it all day.

Thanks for fixing yours so quickly.

Bob
  
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