DELTA 25725 322 626
SVN  刣塃刟 刣 €刟
# Check for C++11 nullptr, and define nullptr as '0' if it's missing
#
AC_DEFUN([FC_CXX11_NULLPTR],
[
  if test "x$cxx_works" = "xyes" ; then
    AC_LANG_PUSH([C++])
    AC_CHECK_HEADERS([cstddef])
    AC_CACHE_CHECK([for C++11 nullptr], [ac_cv_cxx11_nullptr],
      [AC_LINK_IFELSE([AC_LANG_PROGRAM(
[[#ifdef HAVE_CSTDDEF
#include <cstddef>
#endif]],
 [[ int *var = nullptr; ]])],
[ac_cv_cxx11_nullptr=yes], [ac_cv_cxx11_nullptr=no])])
    if test "x${ac_cv_cxx11_nullptr}" != "xyes" ; then
      AC_DEFINE([nullptr], [0], [Fallback since C++11 nullptr not available])
    fi
    AC_LANG_POP([C++])
  fi
])
ENDREP
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END
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18ql.5ck.t28661-1 modify true false /trunk/m4/c++11.m4


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