assertion failed on gcc 4.7.1

[nicolaprezza]

bitvector produces a failed assertion in the DNA aligner ERNE (while constructing the data structure) if the code is compiled using gcc 4.7.1:

erne-create: BWTIL/data_structures/../
common/../extern/bitvector/include/internal/bitvector.hpp:342: std::pair<long unsigned int, long unsigned int> bv::internal::bt_impl<, >::subtree_ref_base::find_insert_point(size_t) const [with bool Const = true; long unsigned int W = 2048ul; bv::allocation_policy_t AP = (bv::allocation_policy_t)0u; size_t = long unsigned int]: Assertion `is_node()' failed.

To reproduce, download ERNE code from https://svn.code.sf.net/p/erne/code/trunk/ (boost required), then configure and compile with gcc 4.7.1. The command that produces the error is

erne-create --fasta vitis.fasta --out structure_name

where "vitis.fasta" is the vitis vinifera genome. The assertion fails at 0% of the construction so it is likely that the problem will occur also with any other input.

Other notes: the program terminates successfully if ERNE is compiled with gcc 4.8+