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AC_CXX_HEADER_UNORDERED_MAP
Check whether the C++ include <unordered_map> exists and define HAVE_UNORDERED_MAP if it does.
Benjamin Kosnik <bkoz@redhat.com>
2008-04-17
AC_DEFUN([AC_CXX_HEADER_UNORDERED_MAP], [ AC_CACHE_CHECK(for unordered_map, ac_cv_cxx_unordered_map, [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_map>], [using std::unordered_map;], ac_cv_cxx_unordered_map=yes, ac_cv_cxx_unordered_map=no) CXXFLAGS="$ac_save_CXXFLAGS" AC_LANG_RESTORE ]) if test "$ac_cv_cxx_unordered_map" = yes; then AC_DEFINE(HAVE_UNORDERED_MAP,,[Define if unordered_map is present. ]) fi ])
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