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Ruby Programming
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Build Environment

When Ruby is compiled for a particular architecture, all of the relevant settings used to build it (including the architecture of the machine on which it was compiled, compiler options, source code directory, and so on) are written to the module Config within the library file ``rbconfig.rb''. After installation, any Ruby program can use this module to get details on how Ruby was compiled.

require "rbconfig.rb"
include Config
CONFIG["host"] "i686-pc-linux"
CONFIG["LDFLAGS"] "-rdynamic"

Extension libraries use this configuration file in order to compile and link properly on any given architecture. See Chapter 17 beginning on page 169, and the reference for mkmf beginning on page 451 for details.

Ruby Programming
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