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In #1622, when targeting WebAsembly, the --allow-undefined flag became unconditionally added to the linker. This is not always desirable. First, this is error prone. Code with references to unkown symbols will link just fine, but then fail at run-time. This behavior is inconsistent with all other targets. For freestanding wasm applications, and applications that only use WASI, undefined references are better reported at compile-time. This behavior is also inconsistent with clang itself. Autoconf and cmake scripts checking for function presence think that all tested functions exist, but then resulting application cannot run. For example, this is one of the reasons compilation of Ruby 3.2.0 to WASI fails with zig cc, while it works out of the box with clang. But all applications checking for symbol existence before compilation are affected. This reverts the behavior to the one Zig had before #1622, and introduces an `import_symbols` flag to ignore undefined symbols, assuming that the webassembly runtime will define them.
A general-purpose programming language and toolchain for maintaining robust, optimal, and reusable software.
Resources
- Introduction
- Download & Documentation
- Chapter 0 - Getting Started | ZigLearn.org
- Community
- Contributing
- Code of Conduct
- Frequently Asked Questions
- Community Projects
Installation
- download a pre-built binary
- install from a package manager
- build from source
- bootstrap zig for any target
License
The ultimate goal of the Zig project is to serve users. As a first-order effect, this means users of the compiler, helping programmers to write better software. Even more important, however, are the end-users.
Zig is intended to be used to help end-users accomplish their goals. Zig should be used to empower end-users, never to exploit them financially, or to limit their freedom to interact with hardware or software in any way.
However, such problems are best solved with social norms, not with software licenses. Any attempt to complicate the software license of Zig would risk compromising the value Zig provides.
Therefore, Zig is available under the MIT (Expat) License, and comes with a humble request: use it to make software better serve the needs of end-users.
This project redistributes code from other projects, some of which have other licenses besides MIT. Such licenses are generally similar to the MIT license for practical purposes. See the subdirectories and files inside lib/ for more details.