5.21 define option (-D) 
This is the "name to add to definition list" option.
This option has some usage constraints.  It:
- 
may appear an unlimited number of times.
- 
is a member of the define class of options.
The AutoGen define names are used for the following purposes:
- 
Sections of the AutoGen definitions may be enabled or disabled
by using C-style #ifdef and #ifndef directives.
- 
When defining a value for a name, you may specify the index
for a particular value.  That index may be a literal value,
a define option or a value #define-d in the definitions themselves.
- 
The name of a file may be prefixed with $NAME/.
The$NAMEpart of the name string will be replaced with
the define-d value forNAME.
- 
When AutoGen is finished loading the definitions, the defined values
are exported to the environment with, putenv(3).
These values can then be used in shell scripts with${NAME}references and in templates with(getenv "NAME").
- 
While processing a template, you may specify an index to retrieve
a specific value.  That index may also be a define-d value.
  
This document was generated
by Bruce Korb on October 18, 2004 using texi2html
 
  