yasm

Assemble to ELF64 object file

$ yasm -f elf64 -o [output.o] [input.asm]

$ yasm -f win64 -o [output.obj] [input.asm]

$ yasm -f elf32 -o [output.o] [input.asm]

$ yasm -p gas -f elf64 -o [output.o] [input.s]

$ yasm -g dwarf2 -f elf64 -o [output.o] [input.asm]

$ yasm -e [input.asm]

$ yasm -D [DEBUG=1] -f elf64 -o [output.o] [input.asm]

yasm [options] infile

yasm is a modular assembler supporting x86 and AMD64 instruction sets. It is a complete rewrite of NASM under the BSD license, offering multiple input syntaxes and output formats.
Supported syntaxes include NASM (default) and GAS (GNU Assembler). Output formats cover ELF, Win32/Win64 PE, Mach-O, COFF, and raw binary. Debug information can be generated in DWARF 2, STABS, or CodeView 8 formats.
The assembler is used for low-level system programming, operating system development, and performance-critical code. It integrates with C/C++ toolchains through standard object file formats.

-f format

Output format: elf32, elf64, win32, win64, macho32, macho64, bin, coff.

Output file name.

Target architecture (default: x86).

Machine type: x86, amd64.

Syntax parser: nasm (default), gas.

Preprocessor: nasm, raw, cpp, gas.

Debug format: dwarf2, stabs, cv8, null.

Define preprocessor macro.

Undefine macro.

Add include search directory.

Pre-include file.

Preprocess only (no assembly).

Inhibit warnings.

Treat warnings as errors.

Display version.

Display help.

Some NASM syntax extensions may not be fully compatible. GAS syntax support is not complete. AMD64 mode requires explicit selection via -m amd64 or 64-bit object format.

yasm was created by Peter Johnson and Michael Urman as a rewrite of NASM with a modular architecture. It aimed to support multiple architectures and syntaxes while maintaining NASM compatibility. Development began in 2001 with the project remaining actively used in various build systems.

nasm(1), as(1), ld(1), objdump(1)