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autoheader2.13 - creates a template file of C #define's for use by configure.


autoheader2.13 [ --help | -h ] [ --localdir=dir | -l dir ] [ --macrodir=dir | -m dir ] [
--version ]


The autoheader2.13 program can create a template file of C #define statements for
configure to use. If configure.in invokes AC_CONFIG_HEADER(FILE), autoheader2.13 creates
FILE.in; if multiple file arguments are given, the first one is used. Otherwise,
autoheader2.13 creates config.h.in.

If you give autoheader2.13 an argument, it uses that file instead of configure.in and
writes the header file to the standard output instead of to config.h.in. If you give
autoheader2.13 an argument of -, it reads the standard input instead of configure.in and
writes the header file to the standard output.

autoheader2.13 scans configure.in and figures out which C preprocessor symbols it might
define. It copies comments and #define and #undef statements from a file called
acconfig.h, which comes with and is installed with Autoconf. It also uses a file called
acconfig.h in the current directory, if present. If you AC_DEFINE any additional symbols,
you must create that file with entries for them. For symbols defined by AC_CHECK_HEADERS,
AC_CHECK_FUNCS, AC_CHECK_SIZEOF, or AC_CHECK_LIB, autoheader2.13 generates comments and
#undef statements itself rather than copying them from a file, since the possible symbols
are effectively limitless.

The file that autoheader2.13 creates contains mainly #define and #undef statements and
their accompanying comments. If ./acconfig.h contains the string @TOP@, autoheader2.13
copies the lines before the line containing @TOP@ into the top of the file that it
generates. Similarly, if ./acconfig.h contains the string @BOTTOM@, autoheader2.13 copies
the lines after that line to the end of the file it generates. Either or both of those
strings may be omitted.

An alternate way to produce the same effect is to create the files FILE.top (typically
config.h.top) and/or FILE.bot in the current directory. If they exist, autoheader2.13
copies them to the beginning and end, respectively, of its output. Their use is
discouraged because they have file names that contain two periods, and so can not be
stored on MS-DOS; also, they are two more files to clutter up the directory. But if you
use the --localdir=DIR option to use an acconfig.h in another directory, they give you a
way to put custom boilerplate in each individual config.h.in.

autoheader2.13 accepts the following options:


-h Print a summary of the command line options and exit.


-l DIR Look for the package files aclocal.m4 and acconfig.h (but not FILE.top and
FILE.bot) in directory DIR instead of in the current directory.


-m DIR Look for the installed macro files and acconfig.h in directory DIR. You can also
set the AC_MACRODIR environment variable to a directory; this option overrides the
environment variable.

Print the version number of Autoconf and exit.

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