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Choose the handoff that matches the data: use build options for user-selected configuration, run-step arguments for tool parameters, and declared output paths for generated files. If a later step needs generated Zig code, expose it as a module dependency. In every case, represent the dependency in the build graph so Zig knows what must run first.
Choose the right handoff for your data
Zig’s build system represents work as a directed acyclic graph. Steps whose dependencies are ready can run independently or concurrently, so execution order should come from explicit dependency relationships rather than assumptions about which step happens to run first. The official Build System guide demonstrates this model across build, run, and generated-file examples.
| What you need to pass | Use | Typical consumer |
|---|---|---|
| A user-selected setting or default | b.option; use the Options mechanism to make values available to Zig source |
build.zig and compiled Zig code |
| Arguments for a process invocation | Add arguments to the run step | An executed tool or program |
| A file produced by a step | Declare the output, such as with addOutputFileArg, and pass its LazyPath |
A later build step or install step |
| Generated Zig code that downstream code imports | Expose the generated source through a module dependency | Compiled Zig code |
| Content or copies created by the build script | Use WriteFiles and pass its generated-file LazyPath |
A later build step or module |
Pass user configuration into compiled Zig code
For a short value chosen by the person invoking the build, define a build option with b.option. The build script can use that value itself; when project Zig source also needs it, use the build system’s Options mechanism to surface the configuration to that source. This keeps a setting distinct from a generated artifact or a command-line argument to a tool.
The official guide documents b.option and Options as the route for passing build-script values into project code. Follow the guide for the API shape supported by your Zig release: build APIs change, and examples on the rolling Zig language documentation page may not match older compilers.
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- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
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Pass arguments to an executed tool
When the value is a parameter for a process the build runs—such as an input path or a mode flag—add it to that process’s run step. This is invocation data, not a file handoff: if the process creates a file that another step needs, declare that file as an output as well.
The guide’s run-step example explicitly makes the application run step depend on building the executable first. Apply the same principle to other tools: the process must be built or otherwise made available before it runs, and any downstream consumer must depend on the producer of its input.
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Pass a generated file to a later step
A file handoff should be visible to the build graph. Have the producer declare the output and pass the resulting LazyPath to the consumer, rather than relying on an assumed location or an undeclared side effect. The guide’s generator pattern uses addOutputFileArg to capture an output path, then wires the generated file into later work.
- Set up the producer. Create the generator or other producing step and pass it any required input arguments.
- Declare its output. Use an output declaration such as
addOutputFileArgso the build system knows which file the step produces. - Give the consumer the resulting path. Pass the returned
LazyPathto the later step that reads, installs, or otherwise uses the file. - Connect the dependency. Ensure the consumer depends on the producer when the API does not establish that relationship through the output path itself. The graph must express the required ordering.
The official guide demonstrates a generated file flowing into an install step. That same graph-visible approach is appropriate for a generator/consumer pipeline; avoid making later steps guess a fixed output directory.
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Make generated Zig source importable
If downstream Zig code must import code produced by a generator, the output is more than a file path: it is also a module input. The guide’s example captures a generated person.zig file and exposes it through a module dependency of the main executable. Zig modules form a directed graph, and source can import another module by name; the language documentation describes both module imports and build-system configuration surfaced as comptime values.
Use this pattern when the consumer needs to compile against generated declarations or definitions. For generated content that is not imported as Zig source, pass the output path to the appropriate file-consuming step instead.
Rank #4
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Write or copy files with WriteFiles
When the build script itself needs to create text or copy existing files into a generated directory, use WriteFiles. The official guide says that the generated files and their parent directory are available as LazyPath values, which lets dependent steps consume those paths through the build graph. This is distinct from a separate generator process: use a run step when another tool must produce the content.
Keep builds cacheable and safe to run concurrently
- Declare outputs. A consumer should receive an output path the build system can track, rather than depending on an undocumented side effect.
- Express dependencies. Steps may run concurrently when independent; add the appropriate graph edge for every required producer-consumer ordering.
- Do not rewrite source files during ordinary builds. The Build System guide warns that mutating source files can cause caching and concurrency bugs.
- Prefer build-managed paths and tools. Passing declared paths through the build APIs avoids assumptions about fixed directories or shell behavior.
Check examples against your Zig version
Zig’s Build API evolves. The official Build System guide includes example help output identifying Zig 0.17.0, while the language documentation URL above points to master and changes over time. Do not assume every sample applies unchanged to an older release: compare the API and examples with the documentation shipped for the compiler you have installed.
Quick Recap
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- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
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