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# We just try to figure out where hash<> is defined. It's in some file
# that ends in hash_fun.h...
#
# Ideally we'd use AC_CACHE_CHECK, but that only lets us store one value
# at a time, and we need to store two (filename and namespace).
# prints messages itself, so we have to do the message-printing ourselves
# via AC_MSG_CHECKING + AC_MSG_RESULT. (TODO(csilvers): can we cache?)
#
# tr1/functional_hash.h: new gcc's with tr1 support
# stl_hash_fun.h: old gcc's (gc2.95?)
# ext/hash_fun.h: newer gcc's (gcc4)
# stl/_hash_fun.h: STLport
AC_DEFUN([AC_CXX_STL_HASH_FUN],
[AC_REQUIRE([AC_CXX_STL_HASH])
AC_MSG_CHECKING(how to include hash_fun directly)
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
ac_cv_cxx_stl_hash_fun=""
for location in functional tr1/functional \
ext/hash_fun.h ext/stl_hash_fun.h \
hash_fun.h stl_hash_fun.h \
stl/_hash_fun.h; do
if test -z "$ac_cv_cxx_stl_hash_fun"; then
AC_TRY_COMPILE([#include <$location>],
[int x = ${ac_cv_cxx_hash_namespace}::hash<int>()(5)],
[ac_cv_cxx_stl_hash_fun="<$location>";])
fi
done
AC_LANG_RESTORE
AC_DEFINE_UNQUOTED(HASH_FUN_H,$ac_cv_cxx_stl_hash_fun,
[the location of the header defining hash functions])
AC_DEFINE_UNQUOTED(HASH_NAMESPACE,$ac_cv_cxx_hash_namespace,
[the namespace of the hash<> function])
AC_MSG_RESULT([$ac_cv_cxx_stl_hash_fun])
])
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