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📛 NAME

config.guess — guess the build system triplet

🚀 Quick Reference

Use Case	Command	Description
🔍 Guess build system type	config.guess	Output the configuration name of the build machine
❓ Show help	config.guess -h	Print help and exit
📅 Show timestamp	config.guess -t	Print date of last modification and exit
🔢 Show version	config.guess -v	Print version number and exit
⚙️ Specify build compiler	CC_FOR_BUILD=clang config.guess	Use a specific compiler for the build machine

📋 SYNOPSIS

config.guess [OPTION]

📝 DESCRIPTION

The GNU build system distinguishes three types of machines, the build machine on which the compilers are run, the host machine on which the package being built will run, and, exclusively when you build a compiler, assembler etc., the target machine, for which the compiler being built will produce code.

This script will guess the type of the build machine.

Output the configuration name of the system config.guess is run on.

⚙️ OPTIONS

• -h, --help — 🖨️ print this help, then exit
• -t, --time-stamp — 📅 print date of last modification, then exit
• -v, --version — 🔢 print version number, then exit

🌐 ENVIRONMENT VARIABLES

config.guess might need to compile and run C code, hence it needs a compiler for the build machine: use the environment variable CC_FOR_BUILD to specify the compiler for the build machine. If CC_FOR_BUILD is not specified, CC will be used. Be sure to specify CC_FOR_BUILD if CC is a cross‑compiler to the host machine.

• CC_FOR_BUILD — 🛠️ a native C compiler, defaults to cc
• CC — ⚗️ a native C compiler, CC_FOR_BUILD is preferred

🐛 REPORTING BUGS

Report bugs and patches to config-patches AT gnu.org.

Originally written by Per Bothner.
Copyright 1992‑2022 Free Software Foundation, Inc.

This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

GNU config.guess (2022‑01‑09) January 2022

📛 NAME 🚀 Quick Reference 📋 SYNOPSIS 📝 DESCRIPTION ⚙️ OPTIONS 🌐 ENVIRONMENT VARIABLES 🐛 REPORTING BUGS