Scan fail when enable --gnu.

[Young_work]

HI, 

I start a scanning and print advertising report when address match on nrf5 SDK v16.0.0 with S140 on nrf52840. It goes well until I enable GNU extension in Keil. I don't know why GNU extension can effect the scanning process. Anyone know why? Thanks!

Young

[Young_work]

Scaning are inited and started successfully without advertising report print when enabled GUN extersion.

[Vidar Berg]

Hello Young,

I'm not familiar with this --gnu setting. Does it enable the GCC compiler, or is it still the ARM compiler but with some GNU extensions?  

Best regards,

Vidar

[Young_work]

Just check GNU extension in C/C++ to enable some GNU festures.

[Vidar Berg]

Thanks for confirming. I was able to reproduce the problem here now. But I was unable to locate the problem. At first I thought it could be an issue with the SV calls made into the Softdevice, but the assembly instructions were the same with and without --gnu enabled. I was also suprised to see that everything appeared to be running normally except for not being able to establish a connection.

Either way, it is clear that we don't support this compile option in our SDK. Please consider using Segger embedded studio if you need these C extensions in your project.

[Young_work]

So is it ok to run your scanning demo on Segger embedded studio with C extension?

[Vidar Berg]

Yes, our Segger embedded studio projects are configured to build with gnu extensions by default (-std=gnu99)

[Young_work]

So nRF5_SDK_v16.0.0 can use Segger embedded studio to compile? I don't want to update SDK.

[Vidar Berg]

Yes, support for Segger embedded studio was introduced in SDK 14.2.0