unifdef ☆

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Description:
Selectively process conditional C preprocessor directives

Type: Formula | Tracked Since: Dec 28, 2025

Links: Homepage | formulae.brew.sh

Category: Developer tools

Tags: c-preprocessor code-processing developer-tools command-line unifdef

Install: brew install unifdef

About:
Unifdef is a command-line utility that evaluates conditional C preprocessor directives in source files. It removes code blocks that are false under a specified set of macros, effectively simplifying the code for a specific configuration. This is useful for maintaining clean, configuration-specific source files without the clutter of conditional logic.

Key Features:

Processes conditional C preprocessor directives (#ifdef, #if, etc.)
Removes unreachable code based on a specified macro configuration
Preserves the integrity of the remaining code structure
Handles complex nested conditions and macro expansions

Use Cases:

Simplifying source code for a specific target platform or configuration
Generating clean, configuration-specific header files from complex templates
Auditing code for dependencies on specific macros

Alternatives:

gcc -E – GCC's preprocessor can be used for similar tasks but is less precise for selectively removing code blocks without full expansion.
unifdef – The original tool, which unifdef is based on, offering similar functionality.

Version History

Detected	Version	Rev	Change	Commit
Sep 11, 2025 11:14am		0	VERSION_BUMP	8edf10ff