clang Command Examples

Compiler for C, C++, and Objective-C source files. Can be used as a drop-in replacement for GCC. More information: https://clang.llvm.org/docs/ClangCommandLineReference.html.

• Compile a source code file into an executable binary:

clang {{input_source.c}} -o {{output_executable}}

• Activate output of all errors and warnings:

clang {{input_source.c}} -Wall -o {{output_executable}}

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

clang {{input_source.c}} -o {{output_executable}} -I{{header_path}} -L{{library_path}} -l{{library_name}}

• Compile source code into LLVM Intermediate Representation (IR):

clang -S -emit-llvm {{file.c}} -o {{file.ll}}

• Compile source code without linking:

clang -c {{input_source.c}}

• Optimize the compiled program for performance:

clang {{path/to/source.c}} -O{{1|2|3|fast}}