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clang++ — Compile C++ source files. Part of LLVM. More information: <https://clang.llvm.org/docs/UsersManual.h

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

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Problem

How to use the clang++ command: Compile C++ source files. Part of LLVM. More information: <https://clang.llvm.org/docs/UsersManual.html#command-line-options>.

Solution

clang++ — Compile C++ source files. Part of LLVM. More information: <https://clang.llvm.org/docs/UsersManual.html#command-line-options>.

Compile a set of source code files into an executable binary:

clang++ {{path/to/source1.cpp path/to/source2.cpp ...}} {{[-o|--output]}} {{path/to/output_executable}}

Activate output of all errors and warnings:

clang++ {{path/to/source.cpp}} -Wall {{[-o|--output]}} {{output_executable}}

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

clang++ {{path/to/source.cpp}} -Wall {{[-g|--debug]}} -Og {{[-o|--output]}} {{path/to/output_executable}}

Choose a language standard to compile for:

clang++ {{path/to/source.cpp}} -std={{c++20}} {{[-o|--output]}} {{path/to/output_executable}}

Include libraries located at a different path than the source file:

clang++ {{path/to/source.cpp}} {{[-o|--output]}} {{path/to/output_executable}} -I{{path/to/header_path}} -L{{path/to/library_path}} -l{{path/to/library_name}}

Compile source code into LLVM Intermediate Representation (IR):

clang++ {{[-S|--assemble]}} -emit-llvm {{path/to/source.cpp}} {{[-o|--output]}} {{path/to/output.ll}}

Optimize the compiled program for performance:

clang++ {{path/to/source.cpp}} -O{{1|2|3|fast}} {{[-o|--output]}} {{path/to/output_executable}}

Display version:

clang++ --version

Code Snippets

Compile a set of source code files into an executable binary

clang++ {{path/to/source1.cpp path/to/source2.cpp ...}} {{[-o|--output]}} {{path/to/output_executable}}

Activate output of all errors and warnings

clang++ {{path/to/source.cpp}} -Wall {{[-o|--output]}} {{output_executable}}

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

clang++ {{path/to/source.cpp}} -Wall {{[-g|--debug]}} -Og {{[-o|--output]}} {{path/to/output_executable}}

Choose a language standard to compile for

clang++ {{path/to/source.cpp}} -std={{c++20}} {{[-o|--output]}} {{path/to/output_executable}}

Include libraries located at a different path than the source file

clang++ {{path/to/source.cpp}} {{[-o|--output]}} {{path/to/output_executable}} -I{{path/to/header_path}} -L{{path/to/library_path}} -l{{path/to/library_name}}

Context

tldr-pages: common/clang++

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