Program received signal SIGSEGV, Segmentation fault.
0x0000000000806eb8 in supportable_widening_operation ()
(gdb) bt
#0  0x0000000000806eb8 in supportable_widening_operation ()
#1  0x0000000000b2b164 in ?? ()
#2  0x0000000000b2bc12 in vect_pattern_recog ()
#3  0x0000000000821045 in vect_slp_analyze_bb ()
#4  0x0000000000821d1b in ?? ()
#5  0x000000000068eab9 in execute_one_pass ()
#6  0x000000000068ed75 in execute_pass_list ()
#7  0x000000000068ed87 in execute_pass_list ()
#8  0x000000000068ed87 in execute_pass_list ()
#9  0x000000000075bf51 in tree_rest_of_compilation ()
#10 0x00000000008a074f in ?? ()
#11 0x00000000008a23fa in cgraph_optimize ()
#12 0x00000000008a27fa in cgraph_finalize_compilation_unit ()
#13 0x00000000004a3925 in c_write_global_declarations ()
#14 0x00000000007207be in toplev_main ()
#15 0x00007ffff6f4576d in __libc_start_main () from 
/lib/x86_64-linux-gnu/libc.so.6
#16 0x00000000004932b9 in _start ()

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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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