1# C++ checks to determine what style of headers to use and 2# whether to use "using" clauses. 3 4AC_DEFUN(AC_CXX_HAVE_STDHEADERS, [ 5AC_SUBST(cxx_have_stdheaders) 6AC_CACHE_CHECK([whether C++ supports the ISO C++ standard includes], 7db_cv_cxx_have_stdheaders, 8[AC_LANG_SAVE 9 AC_LANG_CPLUSPLUS 10 AC_TRY_COMPILE([#include <iostream> 11],[std::ostream *o; return 0;], 12 db_cv_cxx_have_stdheaders=yes, db_cv_cxx_have_stdheaders=no) 13 AC_LANG_RESTORE 14]) 15if test "$db_cv_cxx_have_stdheaders" = yes; then 16 cxx_have_stdheaders="#define HAVE_CXX_STDHEADERS 1" 17fi]) 18