[Octave-bug-tracker] [bug #31047] DLD-FUNCTIONS/fltk_backend.cc:467: error: unable to find a register to spill in class ‘MMX_REGS’

[Rik]

Follow-up Comment #4, bug #31047 (project octave):

Comparison with my compilation on a Linux machine reveals a few things to try
changing in your CFLAGS/CXXFLAGS variable.

"-arch i386"

This option doesn't exist on non-Darwin platforms like mine.  However, if it
accepts the same arguments as -march, then I would use '-arch=native' and let
the compiler figure out what MMX instructions it can use.  

"-O"

You are using the equivalent of "-O1".  GCC is warning that it can't find
enough registers to use.  Sometimes by using more optimization the compiler
can find a way to share registers more efficiently and therefore free up some
for use.  I would try compiling with "-O2".

"-fforce-addr" 

I don't have this turned on.  It might be worth removing this to see if it is
causing the issue.


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