# scons_learn

**Repository Path**: dmcus/scons_learn

## Basic Information

- **Project Name**: scons_learn
- **Description**: No description available
- **Primary Language**: C
- **License**: GPL-3.0
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2025-08-26
- **Last Updated**: 2025-08-27

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# scons_learn

[scons github链接](https://github.com/SCons/scons)

1. pip 直接安装 scons

```
py -m pip install -r requirements.txt
```
2. 使用python虚拟环境安装
[python 虚拟环境](https://packaging.python.org/en/latest/guides/installing-using-pip-and-virtual-environments/#creating-a-virtual-environment)
```
py -m venv .venv
.venv\Scripts\activate
where python
py -m pip install -r requirements.txt
```

3. Sconstruct 编译类型
* Program: 编译成可执行程序, 这是常用的类型
* object: 只编译成目标文件 
* Library: 编译成库文件，默认是指静态链接库
* StaticLibrary: 显示的编译成静态链接库，与上面的 Library 效果一样。
* SharedLibrary: 动态库

4. SCONS [常用变量](https://scons.org/doc/1.2.0/HTML/scons-user/a4774.html)

``` 
AS   //汇编
ASFLAGS //汇编选项

CC  //gcc
CFLAGS  //only c 选项

CXX
CCFLAGS //C and c++
CPPFLAGS
CXXFLAGS

LINKFLAGS //链接选项
LINK      //ld文件

LIBPATH  //库搜索文件夹
LIBS   //库文件

CPPPATH //include的目录

```

5. SCONS Program的实际命令

编译C的时候使用 
```
CCCOM
print("CCCOM:",env['CCCOM']) 
CCCOM:$CC -o $TARGET -c $CFLAGS $CCFLAGS $_CCCOMCOM $SOURCES
```
编译汇编 只引用了 ASFLAGS 
添加 ASFLAGS的时候需要加 -c (gcc -c 编译成.o 文件)
```
ASCOM
print("ASCOM:",env['ASCOM']) 
ASCOM: $AS $ASFLAGS -o $TARGET $SOURCES
```

6.系统环境变量导入 
`ENV={'PATH':os.environ['PATH']}`
```
import os
PREFIX = 'arm-none-eabi-'

env = Environment(
ENV={'PATH':os.environ['PATH']},
CC = PREFIX + 'gcc',
AS = PREFIX + 'gcc ', 
LINK = PREFIX + 'gcc',
TARGET_EXT = 'elf',
SIZE = PREFIX + 'size',
OBJDUMP = PREFIX + 'objdump',
OBJCPY = PREFIX + 'objcopy',
LINKFLAGS=Split('''
-mcpu=cortex-m0plus
-mthumb 
--specs=nosys.specs 
-nostartfiles
-Tlink.ld
''')
```