VS Arduino - Broken #if defined behaviour. Works fine in Arduino IDE

Jun 24^th, 2025 at 3:39am (UTC)

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VS Arduino › Visual Micro › Installation & Troubleshooting › Broken #if defined behaviour. Works fine in Arduino IDE

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Broken #if defined behaviour. Works fine in Arduino IDE (Read 316 times)

TheOzMan Newbies Offline Posts: 7 Joined: Jan 5^th, 2025	Broken #if defined behaviour. Works fine in Arduino IDE May 9^th, 2025 at 8:14am	Print Post
	Visual studio 2022, vMicro 2025.423.2200 I'm writing some code that will support both ESP8266 and ESP32. To do that, I'm using #if defined statements to define the different headers and code. Here is a very simple example. #if defined(ESP8266) #include <ESP8266WiFi.h> #elif defined(ESP32) #include <WiFi.h> #endif In ardunio ide, this compiles and works fine. Using VS and vMicro compiling will also include WiFi.h when only ESP8266 is fined. ESP32 is NOT defined, thefore should be skipped, but the compiler is just including this anyway. Even if I change it to just check for a define: #if defined(ESP8266) #include <ESP8266WiFi.h> #endif #lif defined(ESP32) #include <WiFi.h> #endif It still compiles in WiFi.h. You can see in the attached picture that ESP8266 IS defined and includes the correct header. ESP32 is NOT define, but just tries to include WiFi.h anyway. Like I said, this works as expected using the ardunio IDE. Thanks.

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Simon@Visual Micro Administrator Offline Posts: 2720 Joined: Feb 13^th, 2019	Re: Broken #if defined behaviour. Works fine in Arduino IDE Reply #1 - May 9^th, 2025 at 8:19am	Print Post
	Thanks for the report. Please attach the complete build output as a text file with the below options enabled: vMicro > Compiler > Verbose vMicro > Compiler > Show Build Properties


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TheOzMan Newbies Offline Posts: 7 Joined: Jan 5^th, 2025	Re: Broken #if defined behaviour. Works fine in Arduino IDE Reply #2 - May 9^th, 2025 at 8:28am	Print Post
	Attached. You'll see compile errors as it's included WiFi.h and trying to overwrite previous definitions. Thanks.

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Simon@Visual Micro Administrator Offline Posts: 2720 Joined: Feb 13^th, 2019	Re: Broken #if defined behaviour. Works fine in Arduino IDE Reply #3 - May 9^th, 2025 at 8:48am	Print Post
	If you enable vMicro > Compiler > Deep Search for Libraries + Accurate Prototype Insertion (Gcc-E), and rebuild the sketch it should detect the correct libraries from your #defines (which is the same as the Arduino IDE's Library Discovery process). With this enabled you can also tune where and how deep the Deep Search Process runs using the options on the vMicro > Compiler Menu. If you want to know the optimum settings for your project, run the vMicro > Compiler > Run Build Speed & Library Analysis, which will run a clean build and output at the end the best settings. Build Speed & Library Analysis Documentation: https://www.visualmicro.com/page/Build-Speed-Library-Analysis.aspx All results from Deep Search are cached as far as possible to improve build times on subsequent builds.
	« Last Edit: May 9^th, 2025 at 8:49am by Simon@Visual Micro »

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TheOzMan Newbies Offline Posts: 7 Joined: Jan 5^th, 2025	Re: Broken #if defined behaviour. Works fine in Arduino IDE Reply #4 - May 9^th, 2025 at 9:04am	Print Post
	Thanks Simon. That worked perfectly. Thanks for the quick response!


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