Blame m4/alignof.m4

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#
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# lldp_CHECK_ALIGNOF
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#
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AC_DEFUN([lldp_CHECK_ALIGNOF],[
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  AC_CACHE_CHECK([whether compiler understands __alignof__], lldp_cv_check_alignof, [
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    AC_TRY_COMPILE([],
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	[ return __alignof__(long); ],
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	[ lldp_cv_check_alignof="yes" ],
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	[ lldp_cv_check_alignof="no" ])
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  ])
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  if test x"$lldp_cv_check_alignof" = x"yes"; then
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     AC_DEFINE([HAVE_ALIGNOF], [1], [Define if __alignof__ operator is available])
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  fi
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])