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src/Source/LibJPEG/ckconfig.c  view on Meta::CPAN

/*
 * ckconfig.c
 *
 * Copyright (C) 1991-1994, Thomas G. Lane.
 * This file is part of the Independent JPEG Group's software.
 * For conditions of distribution and use, see the accompanying README file.
 */

/*
 * This program is intended to help you determine how to configure the JPEG
 * software for installation on a particular system.  The idea is to try to
 * compile and execute this program.  If your compiler fails to compile the
 * program, make changes as indicated in the comments below.  Once you can
 * compile the program, run it, and it will produce a "jconfig.h" file for
 * your system.
 *
 * As a general rule, each time you try to compile this program,
 * pay attention only to the *first* error message you get from the compiler.
 * Many C compilers will issue lots of spurious error messages once they
 * have gotten confused.  Go to the line indicated in the first error message,
 * and read the comments preceding that line to see what to change.
 *
 * Almost all of the edits you may need to make to this program consist of
 * changing a line that reads "#define SOME_SYMBOL" to "#undef SOME_SYMBOL",
 * or vice versa.  This is called defining or undefining that symbol.
 */


/* First we must see if your system has the include files we need.
 * We start out with the assumption that your system has all the ANSI-standard
 * include files.  If you get any error trying to include one of these files,
 * undefine the corresponding HAVE_xxx symbol.
 */

#define HAVE_STDDEF_H		/* replace 'define' by 'undef' if error here */
#ifdef HAVE_STDDEF_H		/* next line will be skipped if you undef... */
#include <stddef.h>
#endif

#define HAVE_STDLIB_H		/* same thing for stdlib.h */
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif

#include <stdio.h>		/* If you ain't got this, you ain't got C. */

/* We have to see if your string functions are defined by
 * strings.h (old BSD convention) or string.h (everybody else).
 * We try the non-BSD convention first; define NEED_BSD_STRINGS
 * if the compiler says it can't find string.h.
 */

#undef NEED_BSD_STRINGS

#ifdef NEED_BSD_STRINGS
#include <strings.h>
#else
#include <string.h>
#endif

/* On some systems (especially older Unix machines), type size_t is
 * defined only in the include file <sys/types.h>.  If you get a failure
 * on the size_t test below, try defining NEED_SYS_TYPES_H.
 */

#undef NEED_SYS_TYPES_H		/* start by assuming we don't need it */
#ifdef NEED_SYS_TYPES_H
#include <sys/types.h>
#endif


/* Usually type size_t is defined in one of the include files we've included
 * above.  If not, you'll get an error on the "typedef size_t my_size_t;" line.
 * In that case, first try defining NEED_SYS_TYPES_H just above.
 * If that doesn't work, you'll have to search through your system library
 * to figure out which include file defines "size_t".  Look for a line that
 * says "typedef something-or-other size_t;".  Then, change the line below
 * that says "#include <someincludefile.h>" to instead include the file
 * you found size_t in, and define NEED_SPECIAL_INCLUDE.  If you can't find
 * type size_t anywhere, try replacing "#include <someincludefile.h>" with
 * "typedef unsigned int size_t;".
 */