gpt-undefines (8) - Linux Manuals
gpt-undefines: Generate a list of preprocessor macros that are not defined.
gpt-undefines - Generate a list of preprocessor macros that are not defined.
SYNOPSISgpt-undefines [-srcdir=PATH -config -disable-undefs -verbose -help] headers containing defines
DESCRIPTIONgpt-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.
- 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.
- Prints the list out in a format that can be pasted into an installable header file.
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:
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
AUTHORMichael Bletzinger <mbletzin.ncsa.uiuc.edu> and Eric Blau <eblau.ncsa.uiuc.edu>