While I believe there must have been a reason to restrict libtool to <=
2.4.2, adios compiles just fine with libtool 2.4.6 for me.
In fact, without this change, I'm getting this error:
libtool: Version mismatch error. This is libtool 2.4.6, but the
libtool: definition of this LT_INIT comes from libtool 2.4.2.
libtool: You should recreate aclocal.m4 with macros from libtool 2.4.6
This doesn't make much sense, since spack did build libtool@2.4.2 as a
dependency, and was supposedly trying to use it. My guess is that on
this system (NERSC's cori) the system libtool in /usr/bin, which is
2.4.6 somehow got picked up partially.
3cbd4c8dcf