[Bug bootstrap/66978] New: [6 Regression] bootstrap failure with --with-multilib-list=m32,m64,mx32

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66978

            Bug ID: 66978
           Summary: [6 Regression] bootstrap failure with
                    --with-multilib-list=m32,m64,mx32
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hjl.tools at gmail dot com
  Target Milestone: ---

On Linux/x86-64, r226113 failed to bootstrap with
--with-multilib-list=m32,m64,mx32:

/../../../src-trunk/libquadmath/printf/printf_fp.c: In function ‘hack_digit’:
../../../../src-trunk/libquadmath/printf/printf_fp.c:191:11: internal compiler
error: in emit_move_insn, at expr.c:3552
   wchar_t hack_digit (void)
           ^
0x7f789b emit_move_insn(rtx_def*, rtx_def*)
        ../../src-trunk/gcc/expr.c:3551
0x8566a1 expand_function_start(tree_node*)
        ../../src-trunk/gcc/function.c:5210
0x6fc47e execute
        ../../src-trunk/gcc/cfgexpand.c:6105
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
Makefile:1035: recipe for target 'printf/printf_fp.lo' failed
make[9]: *** [printf/printf_fp.lo] Error 1