Yes, that should be possible. I haven't done any tests with this though, and mintlib for example was compiled using pml. Also there might be discrepancies when using C++, since the library is configured using the math.h that was in place when gcc is compiled. Some constants in /usr/m68k-atari-mint/sys-root/usr/include/c++/8/m68k-atari-mint/*/bits/c++config.h depend on this.
Seems like PML uses instructions which need to be emulated on the 68060.
That might be possible, but i guess that also applies to fdlibm. Both are compiled with m68020-60 for 020 targets.
Edit: that library should already be available as snapshot, take a look at https://github.com/freemint/freemint.gi ... ibm/master
. Current one is https://github.com/freemint/freemint.gi ... bb.tar.bz2
It is compiled using gcc 4.6.4, though