VS Arduino - Compiler keeps forcing C compilation

Oct 31^st, 2025 at 6:19pm (UTC)

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VS Arduino › Visual Micro › Visual Studio 2019, 2022, 2026 › Compiler keeps forcing C compilation

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Compiler keeps forcing C compilation (Read 210 times)

GTiRhil Newbies Offline Posts: 3 Joined: May 19^th, 2024	Compiler keeps forcing C compilation Sep 24^th, 2025 at 8:22am	Print Post
	Hi My problem is so generic and idiotic that I can't post code. When I try to compile my code in Visual Studio it keeps crashing in standard Arduino files when it meets the C++ keyword "class". For example in the standard SPI.h file. I think that it is trying to compile it as C because it reports, for example: adafruit_spidevice.h:9: In file included from adafruit_max31865.h:55: from globals.h:6: from analogi2c.c:1: from spi.h: 1045:1: error: unknown type name 'class 1045 \| class SPISettings { \| ^~~~~ spi.h: 1045:19: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token 1045 \| class SPISettings { etc. I've set the project properties to force compilation as C++ but it's just not getting it. How can I fix it? Sorry to ask such as dumb question.

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Simon@Visual Micro Administrator Offline Posts: 2807 Joined: Feb 13^th, 2019	Re: Compiler keeps forcing C compilation Reply #1 - Sep 24^th, 2025 at 8:33am	Print Post
	Can you enable the vMicro > Compiler > Verbose option, and build the project again and attach the log? (This will show the compiler commands and other detail to allow us to replicate) It also looks like you have "vMicro > Compiler > Deep Search for Libraries + Accurate Prototype Insertion (Gcc-E)" Switched off, which could be impacting the compile as well.


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GTiRhil Newbies Offline Posts: 3 Joined: May 19^th, 2024	Re: Compiler keeps forcing C compilation Reply #2 - Sep 24^th, 2025 at 12:12pm	Print Post
	Hi I'll attach the verbose record. The Deep search does seem to be turned on. Thanks for your help! Hil

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Simon@Visual Micro Administrator Offline Posts: 2807 Joined: Feb 13^th, 2019	Re: Compiler keeps forcing C compilation Reply #3 - Sep 24^th, 2025 at 2:55pm	Print Post
	Thanks for the log, it shows there is a file "analogi2c.c" in the project which will be automatically compiled as C as it has the "c" extension. If this needs to be C++ then rename the file in Solution Explorer to have the "cpp" extension, and after this it will compile it as C++. Does that help, or am I missing something?


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GTiRhil Newbies Offline Posts: 3 Joined: May 19^th, 2024	Re: Compiler keeps forcing C compilation Reply #4 - Sep 25^th, 2025 at 8:05am	Print Post
	I don't know whether you are missing something or not! It seems that I am. I hadn't been getting these errors before, but suddenly I do. I took the easy way out and renamed everything to cpp. I tried changing the project options in Visual Studio to C++ but that didn't help. Thanks for your help


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