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gcc — Preprocess and compile C and C++ source files, then assemble and link them together. Part of GCC (GN

Submitted by: @import:tldr-pages·Mar 2, 2026·

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Problem

How to use the gcc command: Preprocess and compile C and C++ source files, then assemble and link them together. Part of GCC (GNU Compiler Collection). More information: <https://gcc.gnu.org/onlinedocs/gcc/>.

Solution

gcc — Preprocess and compile C and C++ source files, then assemble and link them together. Part of GCC (GNU Compiler Collection). More information: <https://gcc.gnu.org/onlinedocs/gcc/>.

Compile multiple source files into an executable:

gcc {{path/to/source1.c path/to/source2.c ...}} {{[-o|--output]}} {{path/to/output_executable}}

Activate output of all errors and warnings:

gcc {{path/to/source.c}} -Wall {{[-o|--output]}} {{output_executable}}

Show common warnings, debug symbols in output, and optimize without affecting debugging:

gcc {{path/to/source.c}} -Wall {{[-g|--debug]}} -Og {{[-o|--output]}} {{path/to/output_executable}}

Include libraries from a different path:

gcc {{path/to/source.c}} {{[-o|--output]}} {{path/to/output_executable}} -I{{path/to/header}} -L{{path/to/library}} -l{{library_name}}

Compile source code into Assembler instructions:

gcc {{[-S|--assemble]}} {{path/to/source.c}}

Compile source code into an object file without linking:

gcc {{[-c|--compile]}} {{path/to/source.c}}

Optimize the compiled program for performance:

gcc {{path/to/source.c}} -O{{1|2|3|fast}} {{[-o|--output]}} {{path/to/output_executable}}

Display version:

gcc --version

Code Snippets

Compile multiple source files into an executable

gcc {{path/to/source1.c path/to/source2.c ...}} {{[-o|--output]}} {{path/to/output_executable}}

Activate output of all errors and warnings

gcc {{path/to/source.c}} -Wall {{[-o|--output]}} {{output_executable}}

Show common warnings, debug symbols in output, and optimize without affecting debugging

gcc {{path/to/source.c}} -Wall {{[-g|--debug]}} -Og {{[-o|--output]}} {{path/to/output_executable}}

Include libraries from a different path

gcc {{path/to/source.c}} {{[-o|--output]}} {{path/to/output_executable}} -I{{path/to/header}} -L{{path/to/library}} -l{{library_name}}

Compile source code into Assembler instructions

gcc {{[-S|--assemble]}} {{path/to/source.c}}

Context

tldr-pages: common/gcc

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