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dnl Available from the GNU Autoconf Macro Archive at:
dnl http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_cppflags_std_lang.html
dnl
AC_DEFUN([AC_CXX_CPPFLAGS_STD_LANG],
[AC_REQUIRE([AC_CXX_COMPILER_VENDOR])
case "$ac_cv_cxx_compiler_vendor" in
compaq)
# By default, Compaq CXX has an iostream classes implementation
# that is _not_ in the `std' namespace.
$1="$$1 -D__USE_STD_IOSTREAM=1";;
hp)
# When `configure' looks for a C++ header (eg. <iostream>) it invokes
# `aCC -E $CPPFLAGS'. However, including standard C++ headers like
# <iostream> fails if `-AA' is not supplied.
$1="$$1 -AA";;
esac])
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