1GPT-UNDEFINES(8)      User Contributed Perl Documentation     GPT-UNDEFINES(8)
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NAME

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

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

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

20       -srcdir=PATH
21           Use PATH as the directory containing the source code.  Source code
22           in the entire directory tree will be scanned. Default PATH is the
23           directory gpt-undefines was invoked in.
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25       -config
26           Prints the list out in a format that can be pasted into an
27           installable header file.
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29       -disable-undefs
30           Do not count commented out undefines as a define. This technique is
31           used by autoconf to indicate a negative test result.  Example:
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33              /* #undef HAVE_TCP_FASTACK */
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Managing Autoconf defines.

36       By default the defines tested for by the configure script are stored in
37       a file called config.h.  This file should never be installed. to add
38       autoconf defines to config.h simply add the define in the following
39       format to the file acconfig.h:
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41          #undef AUTOCONF_DEFINE
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43       acconfig.h is tranformed into a config.h.in by the script autoheader.
44       Then the configure script transform it into config.h.
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46       A problem occurs when the autoconf defines are used in installed header
47       files.  In this case the defines should be put in an installable header
48       file using the following format:
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50          #ifndef AUTOCONF_DEFINE
51          #undef AUTOCONF_DEFINE
52          #endif
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SEE ALSO

55       autoconf(1) autoheader(1)
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AUTHOR

58       Michael Bletzinger <mbletzin.ncsa.uiuc.edu> and Eric Blau
59       <eblau.ncsa.uiuc.edu>
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63perl v5.12.3                      2011-03-24                  GPT-UNDEFINES(8)