[bug] 添加FATFS后，编译错误，实际用keil编译通过。V3.27.2

[longdeng84]

• 正在文件夹 eide 中执行任务: "unify_builder -p d:\Private\HNLX\multi_meter\multi_meter_mcu\eide\build\multi_meter_mcu\builder.params"

[ INFO ] start building at 2026-07-03 16:34:53

[ TOOL ] Component: ARM Compiler 5.06 update 7 (build 960)

[ INFO ] file statistics (incremental mode)

+---------+-----------+-----------+---------------+--------+
| C Files | Cpp Files | Asm Files | Lib/Obj Files | Totals |
+---------+-----------+-----------+---------------+--------+
| 0 | 0 | 0 | 0 | 0 |
+---------+-----------+-----------+---------------+--------+

[ INFO ] start compiling ...

[ INFO ] start linking ...

Error: L6218E: Undefined symbol ff_convert (referred from ff.o).
Error: L6218E: Undefined symbol ff_wtoupper (referred from ff.o).
Not enough information to list image symbols.
Finished: 1 information, 0 warning and 2 error messages.

ERROR link failed !, exit code: 1

ERROR build failed !, elapsed time 0:0:0

• 终端进程“cmd.exe /D /C "unify_builder -p d:\Private\HNLX\multi_meter\multi_meter_mcu\eide\build\multi_meter_mcu\builder.params"”已终止，退出代码: 1。
• 终端将被任务重用，按任意键关闭。

[github0null]

Undefined symbol 多数情况下是缺少源文件或者库，或者一些函数未被编译

https://discuss.em-ide.com/d/289-keil