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gcc

Guide GCC compiler flag selection for C/C++ builds.

159|20|Updated Feb 20, 2026
Search Tags:#debugging#optimization#c++#compiler#gcc#lto#pgo
One-click install
npx skills add https://github.com/mohitmishra786/low-level-dev-skills --skill gcc
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: gcc
Source: https://github.com/mohitmishra786/low-level-dev-skills/tree/main/skills/compilers/gcc
Command: npx skills add https://github.com/mohitmishra786/low-level-dev-skills --skill gcc

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill helps developers navigate the complexities of the GCC compiler, enabling them to select optimal build flags, understand and resolve compilation errors, and tune performance.

Core Features & Use Cases

  • Flag Selection: Guides users on choosing appropriate flags for debug, release, optimization, and sanitization builds.
  • Error Triage: Provides common error patterns and their solutions, such as undefined references and multiple definitions.
  • Optimization & LTO/PGO: Explains how to leverage Link-Time Optimization (LTO) and Profile-Guided Optimization (PGO) for performance gains.
  • Use Case: A developer encounters a cryptic "undefined reference" error during linking and needs to quickly identify the missing library or incorrect flag order.

Quick Start

Use the gcc skill to find the correct flags for a release build with LTO enabled.

Frequently Asked Questions about gcc

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I fix an undefined reference error during GCC linking?▼

An undefined reference error during GCC linking typically indicates a missing library or incorrect flag order. This Skill helps diagnose compilation errors by identifying the missing library and correcting the linker flag sequence.

What GCC flags should I use for a release build with LTO enabled?▼

For a release build with LTO, you need specific GCC compiler flags to enable Link-Time Optimization. This Skill guides flag selection for optimization levels and configuring LTO to maximize binary performance gains.

How does Profile-Guided Optimization work with the GCC compiler?▼

Profile-Guided Optimization (PGO) with the GCC compiler works by feeding runtime profile data back into the build process. This Skill explains how to leverage PGO alongside LTO to tune and optimize binary performance.

Can I configure GCC sanitizers and debug builds at the same time?▼

Configuring GCC sanitizers and debug builds simultaneously requires specific flag choices to avoid conflicts. This Skill provides guidance on selecting appropriate flags for debug builds and sanitizer instrumentation.

When do I need to worry about ABI concerns when switching GCC optimization flags?▼

ABI concerns when switching GCC optimization flags arise when changing between incompatible build configurations. This Skill covers flag choices for debug vs. release builds and addresses potential ABI compatibility issues.

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