cleonos/kit

CLeonOS App Kit

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kit/ is a standalone user-app SDK for CLeonOS. It builds ring3 ELF apps without depending on CLKS kernel source.

Toolchain

Use an ELF toolchain (not MinGW PE/COFF):

• Recommended: x86_64-elf-gcc + x86_64-elf-ld
• Alternative: clang + ELF-mode ld.lld

What Is Included

• User runtime (runtime/) copied from CLeonOS userland
• Syscall/libc-like headers (include/)
• User linker script (linker/user.ld)
• CMake project and Makefile wrapper
• Sample app: apps/hello/main.c

Default sample behavior:

• prints Hello world!

Quick Start

cd kit
make apps

Output ELF files are generated under:

kit/build/apps/*.elf

Build Only Specific Apps

Build one app:

make apps APPS=hello

Build multiple apps:

make apps APPS=hello,foo,bar

Each app must be a directory under apps/<name>/ with one or more .c files.

App Entry

By default, kit enables runtime/main_adapter.c, so your app can define standard:

int main(int argc, char **argv)

If you need raw CLeonOS entry (cleonos_app_main(int,char**,char**)), configure with:

cmake -S . -B build-cmake -DCLEONOS_KIT_USE_MAIN_ADAPTER=OFF

CMake Direct Usage

cmake -S . -B build-cmake -DCMAKE_BUILD_TYPE=Release
cmake --build build-cmake --target apps

Explicit ELF toolchain example:

cmake -S . -B build-cmake \
  -DCLEONOS_KIT_CC=x86_64-elf-gcc \
  -DCLEONOS_KIT_LD=x86_64-elf-ld
cmake --build build-cmake --target apps

Useful options:

• -DCLEONOS_KIT_APP_NAMES=hello,foo
• -DCLEONOS_KIT_ENABLE_WERROR=OFF
• -DCLEONOS_KIT_OUTPUT_DIR=<path>

Add New App

1. Create directory: apps/myapp/
2. Add source file(s), for example apps/myapp/main.c
3. Rebuild with make apps

Kit auto-discovers app directories.