gpt-undefines(8) - Linux man page

Name

gpt-undefines - Generate a list of preprocessor macros that are not defined.

Synopsis

gpt-undefines [-srcdir=PATH -config -disable-undefs -verbose -help] headers containing defines

Description

gpt-undefines Generates a list of preprocessor macros that are not defined internally in the source code. Macros that are defined in the header files listed during gpt-undefines's invocation will also be excluded.

Options

-srcdir=PATH

Use PATH as the directory containing the source code. Source code in the entire directory tree will be scanned. Default PATH is the directory gpt-undefines was invoked in.
-config
Prints the list out in a format that can be pasted into an installable header file.
-disable-undefs
Do not count commented out undefines as a define. This technique is used by autoconf to indicate a negative test result. Example: 
/* #undef HAVE_TCP_FASTACK */

Managing Autoconf defines.

By default the defines tested for by the configure script are stored in a file called config.h. This file should never be installed. to add autoconf defines to config.h simply add the define in the following format to the file acconfig.h: 

#undef AUTOCONF_DEFINE
acconfig.h is tranformed into a config.h.in by the script autoheader. Then the configure script transform it into config.h.

A problem occurs when the autoconf defines are used in installed header files. In this case the defines should be put in an installable header file using the following format: 

#ifndef AUTOCONF_DEFINE
#undef AUTOCONF_DEFINE
#endif

See Also

autoconf(1) autoheader(1)

Author

Michael Bletzinger <mbletzin.ncsa.uiuc.edu> and Eric Blau <eblau.ncsa.uiuc.edu>

Referenced By

gpt-setup(8)