Greg Schafer wrote:
Currently, -B doesn't add the multilib search paths when processing startfile_prefixes. For example, -B $prefix/lib/ doesn't find startfiles in $prefix/lib/../lib64
GCC has two different schemes for multilib search dirs. One that is used in the gcc build tree, and one that is used in the OS install dirs. See the difference between multilib_dir and multilib_os_dir.
We are doing multilib searches for startfile_prefix. See find_file. However, we are using the gcc build tree form. This is necessary because -B options are used during the gcc build.
Perhaps what you need is to make -B options work both ways, so that they are also useful when pointing into OS dirs like /lib. Or maybe we need yet another option which is like -B but meant to be used in OS dirs instead of in the gcc build tree.
Jim
