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  VS Arduino › › › Changing compile options/flags
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David-II
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Changing compile options/flags
Sep 10th, 2020 at 5:54am
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I feel kind of stupid about this one, but I can't find a way in Visual Micro to change the compilation flags. In particular, the compiler is currently using the flag "-mfpu=fpv4-sp-d16" whereas it should be using "-mfpu=fpv5-d16" for my board. (It's an STM32 board and the STM32 tool uses -mfpu=fpv5-d16, so I know it is supported)

Can anyone tell me where the option to change this compilation flag is located (VS2019Community w/ Visual Micro)? 

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Simon@Visual Micro
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Re: Changing compile options/flags
Reply #1 - Sep 10th, 2020 at 8:39am
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For the STM32 (Official Core from Boards Manager), these flags are set in the boards.txt in the package 
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ards.txt


In here you will see this being defined for each board - e.g.
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Nucleo_144.menu.pnum.NUCLEO_F429ZI.build.flags.fp=-mfpu=fpv4-sp-d16 -mfloat-abi=hard


To alter this within your project (and keep this change even if the core updates), Right click the project in Solution Explorer > Add > Local Board.txt

Then you can add the below line (based on the example above) to override this for your project, and then save and build your project to use the override:
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build.flags.fp=-mfpu=fpv5-sp-d16 -mfloat-abi=hard


Let us know if this works as you need, and if you need further assistance please attach a build log as shown in the yellow box at the top so we can see more about your specific environment.
  
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David-II
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Re: Changing compile options/flags
Reply #2 - Sep 10th, 2020 at 5:01pm
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That worked perfectly, at least once I realized that I had to put the entire prefix for my board into the board.txt file, i.e.

menu.pnum.NUCLEO_H743ZI2.build.flags.fp=-mfpu=fpv5-d16 -mfloat-abi=hard

Also, for anyone else reading this thread with the same or a similar problem, don't forget to set Compiler->Verbose and Compiler->Build Properties in the vMicro menu and look at the beginning of the Micro Build output to see exactly to what the build properties are currently set and the names to use in board.txt to override.

Thank you
  
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