zig-compiler

Original：🇺🇸 English

Translated

Zig compiler skill for systems programming. Use when compiling Zig programs, selecting optimization modes, using zig cc as a C compiler, reading Zig error messages, or understanding Zig's compilation model. Activates on queries about zig build-exe, zig build-lib, optimize modes, ReleaseSafe, ReleaseFast, ReleaseSmall, zig cc, zig ast-check, or Zig compilation errors.

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Sourcemohitmishra786/low-level-dev-skills

Added on2026-02-21

NPX Install

npx skill4agent add mohitmishra786/low-level-dev-skills zig-compiler

SKILL.md Content

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Zig Compiler

Purpose

Guide agents through Zig compiler invocation: optimization modes, output types,

zig cc

as a C compiler drop-in, error message interpretation, and the Zig compilation pipeline.

Triggers

"How do I compile a Zig program?"
"What are Zig's optimization modes and when do I use each?"
"How do I use zig cc to compile C code?"
"How do I read Zig error messages?"
"How do I compile a Zig library?"
"What is zig ast-check?"

Workflow

1. Basic compilation

bash

# Compile and run a single file
zig run src/main.zig

# Compile to executable
zig build-exe src/main.zig

# Compile to static library
zig build-lib src/mylib.zig

# Compile to shared library
zig build-lib src/mylib.zig -dynamic

# Compile to object file
zig build-obj src/main.zig

# Output name
zig build-exe src/main.zig -femit-bin=myapp

2. Optimization modes

Mode	Flag	`-O` equiv	Purpose
`Debug` (default)	`-O Debug`	`-O0 -g`	Fast compile, all safety checks, debug info
`ReleaseSafe`	`-O ReleaseSafe`	`-O2 + checks`	Optimized with safety checks retained
`ReleaseFast`	`-O ReleaseFast`	`-O3`	Maximum speed, safety checks removed
`ReleaseSmall`	`-O ReleaseSmall`	`-Os`	Minimize binary size

bash

zig build-exe src/main.zig -O Debug        # dev builds
zig build-exe src/main.zig -O ReleaseSafe  # production with safety
zig build-exe src/main.zig -O ReleaseFast  # max performance
zig build-exe src/main.zig -O ReleaseSmall # embedded/WASM

Safety checks in

Debug

and

ReleaseSafe

:

Integer overflow → detected and panics with source location
Array bounds checking → panics on OOB
Null pointer dereference → panic (not crash)
```
unreachable
```
→ panic
Enum tag validation → panic on bad cast

ReleaseFast

: turns safety checks into

undefined behaviour

(same semantics as C

-O3

). Use only when you've validated with

ReleaseSafe

first.

3. Target specification

bash

# List all supported targets
zig targets

# Cross-compile for specific target
zig build-exe src/main.zig \
    -target aarch64-linux-gnu \
    -O ReleaseFast

# Embedded (no OS)
zig build-exe src/main.zig \
    -target thumb-freestanding-eabi \
    -O ReleaseSmall

# WebAssembly
zig build-exe src/main.zig \
    -target wasm32-freestanding \
    -O ReleaseSmall \
    --export=main

# Common target triples: cpu-os-abi
# x86_64-linux-gnu, x86_64-windows-gnu, aarch64-macos-none
# thumbv7m-freestanding-eabi, wasm32-wasi, wasm32-freestanding

4. zig cc — C compiler drop-in

Zig ships a C/C++ compiler (

zig cc

/

zig c++

) backed by Clang and musl. It is hermetic — no system libc required.

bash

# Compile C code
zig cc -O2 -Wall main.c -o myapp

# Compile C++ code
zig c++ -std=c++17 -O2 main.cpp -o myapp

# Cross-compile C for ARM (no cross toolchain needed!)
zig cc -target aarch64-linux-gnu -O2 main.c -o myapp-arm

# Statically link with musl
zig cc -target x86_64-linux-musl main.c -o myapp-static

# Use in CMake (override compiler)
CC="zig cc" CXX="zig c++" cmake -S . -B build
cmake --build build

# Use in Makefile
CC="zig cc" make

zig cc

advantages over gcc/clang:

No system toolchain required (fully hermetic)
Built-in cross-compilation for any supported target
Always ships with a recent clang version
musl libc bundled for static Linux builds

5. Emit formats

bash

# Emit LLVM IR
zig build-exe src/main.zig --emit-llvm-ir

# Emit assembly
zig build-exe src/main.zig --emit-asm
cat main.s

# Emit binary and assembly
zig build-exe src/main.zig -femit-bin=myapp -femit-asm=myapp.s

6. AST check and syntax validation

bash

# Check syntax without compiling
zig ast-check src/main.zig

# Format code
zig fmt src/main.zig
zig fmt src/          # format entire directory

# Check formatting without modifying
zig fmt --check src/

# Tokenize (debugging zig fmt)
zig tokenize src/main.zig

7. Reading Zig error messages

Zig error messages include:

Source file and line
Column indicator with arrow
Note messages for context

src/main.zig:10:5: error: expected type 'u32', found 'i32'
    x: i32 = 5,
    ^
src/main.zig:7:5: note: struct field 'x' declared here
    x: u32,
    ^

Key error patterns:

Error	Meaning
`error: expected type 'X', found 'Y'`	Type mismatch
`error: use of undeclared identifier 'X'`	Missing import or typo
`error: integer overflow`	Comptime overflow (caught at compile)
`error: cannot assign to constant`	Mutating a `const` variable
`error: unused variable 'x'`	All variables must be used
`error: unused function parameter 'x'`	Use `_ = x;` to suppress

Suppress "unused" errors:

zig

_ = unused_variable;  // explicitly discard

8. Version and environment

bash

# Check Zig version
zig version

# Show build configuration
zig env

# Show standard library location
zig env | grep lib_dir

For optimization mode details and target triple reference, see references/zig-optimize-modes.md.

Related skills

Use
```
skills/zig/zig-build-system
```
for multi-file projects with build.zig
Use
```
skills/zig/zig-cinterop
```
for calling C from Zig and vice versa
Use
```
skills/zig/zig-cross
```
for cross-compilation targets and sysroots
Use
```
skills/zig/zig-debugging
```
for GDB/LLDB with Zig binaries

zig-compiler

NPX Install

Tags

SKILL.md Content

Zig Compiler

Purpose

Triggers

Workflow

1. Basic compilation

2. Optimization modes

3. Target specification

4. zig cc — C compiler drop-in

5. Emit formats

6. AST check and syntax validation

7. Reading Zig error messages

8. Version and environment

Related skills