🔍 Clang Diagnostic Flags Explorer

Overview

This tool helps you explore Clang diagnostic (warning) flags and their relationships. It shows which flags imply other flags, helping you optimize your compilation settings by removing redundant warnings.

Legend - Flag Badges

How to Use

Browse and Search:

• Use the search box to filter flags by name
• Click any flag to see its relationships and documentation
• Press / to focus the search box

Add Flags to Basket:

• Click the + button next to any flag to add it to your basket
• The button changes to ✓ when the flag is in the basket
• Click ✓ again to remove the flag from the basket

Import Multiple Flags:

• Click "Import Compilation Flags" to expand the paste box
• Paste your compilation flags in any format
• Click "Select Flags" to add all valid flags to the basket

Analyze Redundancy:

• Once you have 2+ flags in the basket, the Redundancy Analysis panel appears
• The left column shows all your selected flags
• The right column shows the minimal equivalent set
• Redundant flags are marked with strikethrough and show which flag implies them
• Click "Copy Minimal Set" to copy the optimized flag list

Understanding Flag Relationships

Implies (→): When you enable a flag like -Wall, it automatically enables many other flags. These are shown in the "All implied flags" section.

Implied by (←): Shows which other flags would enable this flag if they were used.

Direct vs Transitive: Flags with a thicker border are directly implied. Others are transitively implied (implied by an implied flag).

Tips

• Use the redundancy analysis to optimize your build configuration
• Click flag names in the analysis to see their details
• Share links to specific flags by clicking the 🔗 icon in the detail view
• The basket persists while you browse, so you can build your selection gradually