用rt thread env生成的gd32工程怎么修改芯片型号

问题遇到的现象和发生背景

用rt thread env生成的是gd32f303ZE工程，我在mdk改成gd32f303RC就警告，报错，rt thread程序不能正常运行。

1. 先是在 device 中将gd32f303ZE改成gd32f303RC
   然后mdk5编译信息：

        #warning "Compiler generates FPU instructions for a device without an FPU (check __FPU_PRESENT)"
   Libraries\GD32F30x_standard_peripheral\Source\gd32f30x_rcu.c: 1 warning, 0 errors
   compiling gd32f30x_timer.c...
   Libraries\CMSIS\core_cm4.h(118): warning:  #1215-D: #warning directive: "Compiler generates FPU instructions for a device without an FPU (check __FPU_PRESENT)"
        #warning "Compiler generates FPU instructions for a device without an FPU (check __FPU_PRESENT)"
   Libraries\GD32F30x_standard_peripheral\Source\gd32f30x_timer.c: 1 warning, 0 errors
   linking...
   Program Size: Code=93248 RO-data=12436 RW-data=900 ZI-data=4492  
   After Build - User command #1: fromelf --bin .\build\rtthread-gd32f30x.axf --output rtthread.bin
   ".\build\rtthread-gd32f30x.axf" - 0 Error(s), 32 Warning(s).
   

   这时程序下载后，不能正常运行。

2.然后在 target 中关掉 single precision 后
mdk5编译信息：报错

.\build\rtthread-gd32f30x.axf: Error: L6366E: main.o attributes are not compatible with the provided attributes .
Object main.o contains Build Attributes that are incompatible with the provided attributes.
    Tag_FP_arch = VFPv4 instructions were permitted, but only citing registers D0-D15 (=6)
    Tag_ABI_HardFP_use = This code should execute on the single-precision variant derived from Tag_FP_arch (=1)
    Tag_FP_HP_extension = Use of the optional half-precision extension to VFPv3/Advanced SIMDv1 was permitted (=1)

截个报错图看看