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AC_CXX_HEADER_UNORDERED_SET
Check whether the C++ include <unordered_set> exists and define HAVE_UNORDERED_SET if it does.
Benjamin Kosnik <bkoz@redhat.com>
2008-04-17
AC_DEFUN([AC_CXX_HEADER_UNORDERED_SET], [ AC_CACHE_CHECK(for unordered_set, ac_cv_cxx_unordered_set, [AC_REQUIRE([AC_COMPILE_STDCXX_0X]) AC_LANG_SAVE AC_LANG_CPLUSPLUS ac_save_CXXFLAGS="$CXXFLAGS" CXXFLAGS="$CXXFLAGS -std=gnu++0x" AC_TRY_COMPILE([#include <unordered_set>], [using std::unordered_set;], ac_cv_cxx_unordered_set=yes, ac_cv_cxx_unordered_set=no) CXXFLAGS="$ac_save_CXXFLAGS" AC_LANG_RESTORE ]) if test "$ac_cv_cxx_unordered_set" = yes; then AC_DEFINE(HAVE_UNORDERED_SET,,[Define if unordered_set is present. ]) fi ])
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