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91 lines
2.4 KiB
C
91 lines
2.4 KiB
C
/*
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* have_unused - Determine if we want or can support the unused attribute
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*
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* Copyright (C) 2004,2021 Landon Curt Noll
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*
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* Calc is open software; you can redistribute it and/or modify it under
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* the terms of the version 2.1 of the GNU Lesser General Public License
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* as published by the Free Software Foundation.
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*
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* Calc is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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* Public License for more details.
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*
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* A copy of version 2.1 of the GNU Lesser General Public License is
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* distributed with calc under the filename COPYING-LGPL. You should have
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* received a copy with calc; if not, write to Free Software Foundation, Inc.
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Under source code control: 2004/02/22 22:36:10
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* File existed as early as: 2004
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*
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* chongo <was here> /\oo/\ http://www.isthe.com/chongo/
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* Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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*/
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/*
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* usage:
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* have_unused
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*
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* Not all compilers support the unused attribute, so this may not compile
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* on your system.
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*
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* This prog outputs several defines:
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*
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* HAVE_UNUSED
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* defined ==> OK to use unused
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* undefined ==> do not use unused
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*
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* UNUSED
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* unused ==> use unused
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* (nothing) ==> unused not used
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*/
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#include <stdio.h>
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#include "banned.h" /* include after system header <> includes */
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#if !defined(HAVE_NO_UNUSED)
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/* make sure that we can use the __attribute__((x)) in #define's */
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#undef UNUSED
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#define UNUSED(x) UNUSED_ ## x __attribute__((unused))
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/*
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* unused_str - a function with an unused argument
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*/
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static char *
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unused_str(char *UNUSED(str))
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{
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return "UNUSED_ ## x __attribute__((unused))";
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}
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#endif /* !HAVE_NO_UNUSED */
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int
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main(void)
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{
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#if defined(HAVE_NO_UNUSED)
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printf("#undef UNUSED\n");
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printf("#if defined(__LCLINT__)\n");
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printf("# define UNUSED(x) /*@unused@*/ x\n");
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printf("#else\n");
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printf("# define UNUSED(x) x\n");
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printf("#endif\n");
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#else /* HAVE_NO_UNUSED */
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printf("#undef UNUSED\n");
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printf("#define UNUSED(x) %s\n", unused_str(NULL));
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#endif /* HAVE_NO_UNUSED */
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/* exit(0); */
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return 0;
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}
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