C CPP Project Framework (Template)

Simple and configurable C/C++ project/SDK template

CMake build system and support Kconfig with GUI configuration

Based on this project, you can quickly build your project construction system and reduce many unnecessary troubles~

If it helps you, please give a little star in the upper right corner~~ If needs improvement, just create an issue. (´ε｀ ʃƪ)♡

The target developer of this project:

Developers who are preparing to write SDK and need to write their own build system
Preparing to start writing a project who needs to write a build system
Who don't know much about CMake, but want to learn CMake
Who want to refactor the code engineering build system, maybe because of th bad old messy build system
Who want to add a very useful configuration system to the build system, you can quickly add and delete code modules as needed, and it is best to have an GUI configuration.
Who want the project to generate a variety of IDE supported projects.

Features

The syntax is simple, no knowledge of Makefile or CMake is required, and it is very simple to use only by modifying the value of the variable based on the template
Project structure based on the concept of component, which is convenient for building a project structure with a clear hierarchical structure
Calling between components only requires one statement to specify the dependencies (such as list(APPEND ADD_REQUIREMENTS component1)), without setting extra variables such as INCLUDE path to call the content of the dependent component in the source code
Use Kconfig to enable project components and code to be tailored and configured to facilitate the project to meet different needs
Conveniently introduce static libraries (.a) and dynamic libraries (.so) (such as list(APPEND ADD_STATIC_LIB "lib/libtest.a"))
Conveniently generate static libraries (.a) and dynamic libraries (.so) (by default, static libraries are generated. If you need components to generate dynamic libraries, you can use register_component(DYNAMIC) to register the module)
Using the Python script as an aid, you can easily add commands and tools, and you only need to execute simple commands to compile (such as python project.py build python project.py menuconfig)
Conveniently used as SDK, the project example can be placed directly in the SDK directory, or it can be placed anywhere on the disk separately, just set the environment variable MY_SDK_PATH
Cross-compilation friendly, well as an embedded device SDK
Generate a variety of IDE supported projects, then you can directly import to IDE as a project
Support compile to WASM(Web Assembly)

Get Started

Clone code by:
```
git clone https://github.com/Neutree/c_cpp_project_framework --recursive
```
Arg --recursive is needed to clone all submodule, or code is not complete
Or create your github repository based on this template:
You can create your github repository with this tempalte by click use this template button
Start compile
there's two way, use project.py script or use original CMake command
- With project.py(recommend)
```
cd examples/demo1
# python project.py --toolchain /opt/toolchain/bin --toolchain-prefix mips-elf- config
python project.py menuconfig
python project.py build
# python project.py rebuild    # when you add/remove source files, should use this command instead of build
# you can use --verbose arg to see more compile info, this is useful when error occurs
# python project.py build --verbose
python project.py run        # or ./build/demo1
python project.py clean
python project.py distclean
# python project.py clean_conf
```
- Change dir to project directory
- Set toolchain path(don't need set if use gcc)
- Config project by command python project.py menuconfig, it will generate global_config files at build/config directory, so we can use it in component's CMakelists.txt directly， or in C/CPP source files by #include "global_config.h"
- Build project by command python project.py build, or output verbose build info with command python project.py build --verbose
- Clean build by python project.py clean, clean config generated by menuconfig by python project.py distclean, this command will not clean toolchain config
- Clean toolchain config by python project.py clean_conf
- With original CMake command
```
cd examples/demo1
# python project.py --toolchain /opt/toolchain/bin --toolchain-prefix mips-elf- config
mkdir build && cd build
cmake ..
make menuconfig
make -j10
./build/demo1
make clean
rm -rf ./*
```
- Change dir to project directory
- Set toolchain path(don't need set if use gcc)
- Make a temporary directory and switch the current path to this directory(build)
- Generate makefile by command cmake .., .. means the project directory
- Config project by command make menuconfig, it will generate global_config files at build/config directory, so we can use it in component's CMakelists.txt directly， or in C/CPP source files by #include "global_config.h"
- Build project by command make, or parallel build with make -jN， and output verbose build info with command make VERBOSE=1

Structure

directory/file	function
root directory	root directory of this project, also `SDK` projects' `SDK` directory
assets	store assets like image etc. you can delete it if not use it
components	as a component/lib
examples	project dir or demo dir； `SDK` projects' example/project dir, this directory can be separated from the `SDK` directory, just set environment`MY_SDK_PATH` to `SDK` directory's path.
tools	tools like `cmake`、`kconfig`、`burn tool` etc.
Kconfig	root `Kconfig` configuration

1) Component

All libraries are placed as components in the components directory or under the project directory. Each component uses a directory. This directory is the name of the component. In order to make the project look more concise, the components are not nested. All components are a hierarchy, and the relationships between components depend on dependencies to maintain

All source files must be in a component. Each project must contain a component called main (ie examples/demo1/main directory). Each component contains the following files:

CMakeLists.txt: Must exist, declare the component source file and the dependent component, and call the registration function to register itself. For details, please refer to CMakeLists.txt of components/component1 and components/component2.
Kconfig: Optional, contains configuration options for this component. In this component or other CMakeLists.txt that depends on the component of this component, you can use these configuration items after adding a CONFIG_ prefix. e.g. In components/component2, there is a COMPONENT2_ENABLED option in Kconfig. We use this variable if(CONFIG_COMPONENT2_ENABLED) in its CMakeLists.txt to determine if the user configuration want to register this component or not.

2) Project Directory

The project directory is in the examples directory. Of course, the name of this directory can be modified according to actual needs. The following can contain multiple actual project directories. You can compile when you need to compile the project and switch to the corresponding directory. As mentioned above, there must be a main component in each project directory. Of course, you can also put a lot of custom components. More refer to the examples/demo1 project directory.

Files under the project directory:

CMakeLists.txt: must exist, project properties file, you must first include include(${SDK_PATH}/tools/cmake/compile.cmake), then use the project function to declare project name, such as project(demo1), Of course, you can also write other conditions or variables, etc., using the CMake syntax, refer to the examples/demo1/CMakeLists.txt
config_defaults.mk: Optional, project default configuration file, the default configuration will be loaded when cmake execute. The format of the configuration is Makefile. You can use the terminal GUI configuration (make menuconfig) to generate the configuration file, the generated configuration file is in build/config/global_config.mk, then copy to config_defaults.mk.

Note: After modifying config_defaults.mk, you need to delete the files in the build directory (or just delete the mk file in the build/config directory) to regenerate, because the current build system will use the existing configuration file (build/config/global_config.mk)
project.py: tool script call entry, use python project.py menuconfig python project.py build and other commands to start building

How to put the project directory anywhere on the disk:

Change the MY_SDK_PATH in CMakeLists.txt and project.py to the name of the environment variable you like, and then set the value of this environment variable in the terminal to the path of the SDK, you can change the project directory It can be compiled anywhere

Store SDK and project directory separately

Normally, you only need to modify the name of the example directory according to your needs, such as changing it to projects, or creating a new directory in the project root directory, such as projects/hello_world, and copy files in the examples/demo1's content to start a project

In addition, the project directory and the SDK directory can also be stored separately. This is especially used for open source projects, a copy of SDK, users develop based on this SDK, which is more conducive to the spread of routines, users do not need to copy a copy of the SDK, just specify the use SDK version (git commit number) To do this, only need:

Download SDK and put it in a directory, such as /home/neucrack/my_SDK

git clone https://github.com/Neutree/c_cpp_project_framework --recursive

Note that the --recursive parameter is used here, because sub-modules are used in the project. The advantage of sub-modules is that each project is managed separately. For example, Kconfiglib is used as a sub-module to provide menuconfig with interface function configuration

If you did't update submodule, the compile will error!!!!

If you forget to add this parameter when cloning, you can also use the following command to update the submodule:

git submodule update --init --recursive

In addition, when the remote repository is updated, the user also needs to use the following command to update the code (ie update the submodule code at the same time):

git pull --recursive

or:

git pull
git submodule update --init --recursive

Of course, you can also just delete the .git directory, and start a git repository with no submodule~~~

Then export the variable export MY_SDK_PATH=/home/neucrack/my_SDK in the terminal, which can be placed in the ~/.bashrc or ~/.zshrc file, so that this variable will be automatically added every time the terminal is started
Then create a project anywhere, such as copy the entire content of the folder of example/demo1 to /home/neucrack/temp/my_projects/demo1
Then clear the previous build cache (if there is one, ignore it if there is none)
```
python3 project.py distclean
```

Then configure and build

python3 project.py menuconfig
python3 project.py build

Custom components path

Generally, the common components are placed in the SDK directory -> components directory, and the project-specific components are placed in the project directory. In addition, users can also customize the storage location of their common components by setting the system environment variable CUSTOM_COMPONENTS_PATH, for example: Linux:

export CUSTOM_COMPONENTS_PATH=/home/neucrack/my_components

Windows just add CUSTOM_COMPONENTS_PATH variable in the environment variable interface.

The name CUSTOM_COMPONENTS_PATH can be modified according to your project name or preference in the project.py and CMakeLists.txt of the project.

Then you can directly use list(APPEND ADD_REQUIREMENTS component_name) to reference it in the project component.

Debug and Release version

By default, it is compiled in debug version. If you want to release version, you can use the following command:

python project.py distclean
python project.py build --release

Then the binary file built is the release version, and the compilation script does a few actions:

Set the CMake environment variable CMAKE_BUILD_TYPE to MinSizeRel (default is Debug)
Add #define RELEASE 1 to the generated header file global_config.h (default will add #define DEBUG 1)
Automatically add the macro definition RELEASE=1 when compiling, so the code actually does not need to import global_config.h can also through RELEASE and DEBUG macro definition to determine whether the current is release version or debug version

Change project generator

Sometimes you want to faster build speed or generate project for some IDE like Visual Studio, you can change generator to achieve this, default generator is Unix Makefiles.

There are many generator choices, such as Ninja, Visual Studio, Xcode, Eclipse, Unix Makefiles etc. Execute command cmake --help to see the generator choices, different system support different generators. Linux for example:

Generators

The following generators are available on this platform (* marks default):
  Green Hills MULTI            = Generates Green Hills MULTI files
                                 (experimental, work-in-progress).
* Unix Makefiles               = Generates standard UNIX makefiles.
  Ninja                        = Generates build.ninja files.
  Ninja Multi-Config           = Generates build-<Config>.ninja files.
  Watcom WMake                 = Generates Watcom WMake makefiles.
  CodeBlocks - Ninja           = Generates CodeBlocks project files.
  CodeBlocks - Unix Makefiles  = Generates CodeBlocks project files.
  CodeLite - Ninja             = Generates CodeLite project files.
  CodeLite - Unix Makefiles    = Generates CodeLite project files.
  Eclipse CDT4 - Ninja         = Generates Eclipse CDT 4.0 project files.
  Eclipse CDT4 - Unix Makefiles= Generates Eclipse CDT 4.0 project files.
  Kate - Ninja                 = Generates Kate project files.
  Kate - Unix Makefiles        = Generates Kate project files.
  Sublime Text 2 - Ninja       = Generates Sublime Text 2 project files.
  Sublime Text 2 - Unix Makefiles
                               = Generates Sublime Text 2 project files.

You can change it by config command

# clean all build files first(remove build dir)
python project.py distclean

python project.py -G Ninja config
# python project.py -G "Eclipse CDT4 - Ninja" config

python project.py build

Compile to WASM

Install toolchain first according to emscripten-core/emsdk

git clone https://github.com/emscripten-core/emsdk.git
./emsdk install latest
./emsdk activate latest

Just only set toolchain

python project.py distclean
python project.py --toolchain $EMSDK/upstream/emscripten/cmake/Modules/Platform/Emscripten.cmake config
python project.py build

Then you will find demo1.html, demo1.js and demo1.wasm files in build directory, run command below you will see result in browser:

emrun demo1.html

Or just run by node

node demo1.js

Add command

By default we can use python project.py run to call tools/cmds/run.py file, and execute the binary file. If you want to add commands for your SDK, just create new py file in tools directory, write a script and content refer to tools/cmds/run.py.

Online Debugging

VSCode + GDB Online Debugging

Here take PC with Linux system as an example:

Add c_cpp_project_framework (recommended for the first trial) or project directory to VSCode workspace
Copy the ./assets/vscode_local_debug/.vscode directory to the working directory of the previous step
Edit the cwd field in .vscode/launch.json according to whether .vscode is under c_cpp_project_framework or under the project directory
Press F5 on the keyboard to start debugging

Windows is similar, just modify the relevant commands and paths in .vscode

VSCode + gdbserver Debugging on Embedded Device (/Remote Device with Linux System)