Just checked: It's really only that single file of MPFR (set_f.c)
Ubuntu's current GCC / cc1 crashes on with '-O3'.
After 'make' failed in the first place, I just took the libtool command
("/bin/bash ../libtool --tag=CC --mode=compile gcc ..."), replaced the
two occurrences of '-O3' by '-O2', executed that, then resumed the build
by typing 'make' again.
That succeeded (compiling also all remaining files with '-O3'), as well
as afterwards 'make check' did (which again involves building).
(This was a build outside of and completely unrelated to Sage, with GMP
5.0.4 built from scratch, but on the same machine.)
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https://bugs.launchpad.net/bugs/968766
Title:
GCC 4.6.3 (cc1) crashes when compiling MPFR 3.1.0
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