gcc编译 nano移植

5 nano版本context_gcc编译失败

发布于 2021-12-06 14:19:52 浏览：667 订阅该版

[tocm]

# 环境配置

GCC版本：10.3.1
> gcc version 10.3.1 20210824 (release) (GNU Arm Embedded Toolchain 10.3-2021.10)

nano版本：
> github master分支(https://github.com/RT-Thread/rtthread-nano)
> （好像里面没有版本号的概念）

# 问题描述

执行编译命令：
```
arm-none-eabi-gcc -c -mcpu=cortex-m4 -mthumb -mfloat-abi=hard -mfpu=fpv4-sp-d16  rtthread-nano-master/rt-thread/libcpu/arm/cortex-m4/context_gcc.s
```

报错如下：
```
rtthread-nano-master/rt-thread/libcpu/arm/cortex-m4/context_gcc.s: Assembler messages:
rtthread-nano-master/rt-thread/libcpu/arm/cortex-m4/context_gcc.s:110: Error: thumb conditional instruction should be in IT block -- `vstmdbeq r1!,{d8-d15}'
rtthread-nano-master/rt-thread/libcpu/arm/cortex-m4/context_gcc.s:119: Error: thumb conditional instruction should be in IT block -- `moveq r4,#0x01'
rtthread-nano-master/rt-thread/libcpu/arm/cortex-m4/context_gcc.s:140: Error: thumb conditional instruction should be in IT block -- `vldmiane r1!,{d8-d15}'
rtthread-nano-master/rt-thread/libcpu/arm/cortex-m4/context_gcc.s:148: Error: thumb conditional instruction should be in IT block -- `bicne lr,lr,#0x10'
```

#类似问题参考

参考问题：[context_gcc.S文件编译问题：](https://club.rt-thread.org/ask/question/4188.html)（https://club.rt-thread.org/ask/question/4188.html）

按照问题描述，增加选项：

```
-mimplicit-it=thumb
```

增加后gcc不识别此选项：

```
arm-none-eabi-gcc.exe: error: unrecognized command-line option '-mimplicit-it=thumb'
```