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dnl Copyright (C) 2004-2008 Kim Woelders
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dnl This code is public domain and can be freely used or copied.
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dnl Originally snatched from somewhere...
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dnl Macro for checking if the compiler supports __atribute__
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dnl Usage: AC_C___ATTRIBUTE__
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dnl Call AC_DEFINE for HAVE___ATTRIBUTE__ and __UNUSED__.
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dnl If the compiler supports __attribute__, HAVE___ATTRIBUTE__ is
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dnl defined to 1 and __UNUSED__ is defined to __attribute__((unused))
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dnl otherwise, HAVE___ATTRIBUTE__ is not defined and __UNUSED__ is
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dnl defined to nothing.
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AC_DEFUN([AC_C___ATTRIBUTE__],
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[
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