efriedma added a comment.

So you want int128_t for compiler-rt itself, so you can use the soft-float 
implementation, but you want to make int128_t opt-in to avoid the possibility 
of someone getting a link error trying to link code built with clang against 
libgcc.a?  That seems a little convoluted, but I guess it's okay.

Not sure I like the name "-fuse-int128"; doesn't really indicate what it's 
doing.  Maybe "-fforce-enable-int128".

  rC Clang


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