zig-espressif-bootstrap

Note: This fork adds new CPUs for xtensa targets, replacing llvm-upstream to espressif-llvm fork.

• Xtensa
  • esp32
  • esp32s2
  • esp32s3
  • esp8266
  • cannon lake
• RISC-V
  • esp32p4 (based on riscv32-imafc)

The purpose of this project is to start with minimum system dependencies and end with a fully operational Zig compiler for any target.

Version Information

This repository copies sources from upstream. Patches listed below. Use git to find and inspect the patch diffs.

• LLVM, LLD, Clang 19.1.2 (espressif fork)
• zlib 1.3.1
• zstd 1.5.2
• zig 0.14.0

For other versions, check the git tags of this repository.

Patches

• all: Deleted unused files.
• LLVM: Support .lib extension for static zstd.
• LLVM: Portable handling of .def linker flag
• Clang: Disable building of libclang-cpp.so.
• LLD: Added additional include directory to Zig's libunwind.
• LLD: Respect LLD_BUILD_TOOLS=OFF
• zlib: Delete the ability to build a shared library.

Host System Dependencies

• C++ compiler capable of building LLVM, Clang, and LLD from source (GCC 5.1+ or Clang)
• CMake 3.19 or later
• make, ninja, or any other build system supported by CMake
• POSIX system (bash, mkdir, cd)
• Python 3

Build Instructions

./build <arch>-<os>-<abi> <mcpu>

All parameters are required:

• <arch>-<os>-<abi>: Replace with one of the Supported Triples below, or use native for the <arch> value (e.g. native-linux-gnu) to use the native architecture.
• <mcpu>: Replace with a -mcpu parameter of Zig. baseline is recommended and means it will target a generic CPU for the target. native means it will target the native CPU. See the Zig documentation for more details.

Please be aware of the following two CMake environment variables that can significantly affect how long it takes to build:

• CMAKE_GENERATOR can be used to select a different generator instead of the default. For example, CMAKE_GENERATOR=Ninja.
• CMAKE_BUILD_PARALLEL_LEVEL can be used to introduce parallelism to build systems (such as make) which do not default to parallel builds. This option is irrelevant when using Ninja.

When it succeeds, output can be found in out/zig-<triple>-<cpu>/.

Windows Build Instructions

Bootstrapping on Windows with MSVC is also possible via build.bat, which takes the same arguments as build above.

This script requires that the "C++ CMake tools for Windows" component be installed via the Visual Studio installer.

The script must be run within the Developer Command Prompt for VS 2019 shell:

build.bat <arch>-<os>-<abi> <mcpu>

To build for x86 Windows, run the script within the x86 Native Tools Command Prompt for VS 2019.