File: autoconf.info,  Node: Results,  Next: Programming in M4,  Prev: Writing Tests,  Up: Top

7 Results of Tests
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Once ‘configure’ has determined whether a feature exists, what can it do
to record that information?  There are four sorts of things it can do:
define a C preprocessor symbol, set a variable in the output files, save
the result in a cache file for future ‘configure’ runs, and print a
message letting the user know the result of the test.

* Menu:

* Defining Symbols::            Defining C preprocessor symbols
* Setting Output Variables::    Replacing variables in output files
* Special Chars in Variables::  Characters to beware of in variables
* Caching Results::             Speeding up subsequent ‘configure’ runs
* Printing Messages::           Notifying ‘configure’ users