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924cec8ea9c2bdcdbb66475e2989a4364ff0f07d
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m4
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cxx_flag_check.m4
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AC_DEFUN
([
CXX_FLAG_CHECK
],
[
AC_SUBST
(
$1
,
`$CXX -Werror patsubst($2, [^-Wno-], [-W]) -fsyntax-only -xc /dev/null 2>/dev/null && echo $2`
)])