@@ -87,7 +87,19 @@ On the menuconfig page, configure and select the corresponding chip model, if th
**MDK and IAR must manually select the chip signal once in the project after the project is built, otherwise a serious compilation error will be generated.**
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Note: Because some versions of Keil5 have issues with AC6 compiler support, it is recommended to upgrade keil to the latest version
> [Download the latest version of Keil here](https://www.keil.com/update/check.asp?P=MDK&V=5.38.0.0&S=)
Some error messages are as follows:
![](./figures/bug.png)
Or you can choose to refer to this forum post:[AC6 compiler error unsupported option '--c99' solution](https://club.rt-thread.org/ask/question/4c744e41ded5efb0.html)