re PR c/39464 (Attribute may_alias causes invalid warning)
PR c/39464 * c-typeck.c (convert_for_assignment): For -Wpointer-sign warning require that both c_common_unsigned_type as well as c_common_signed_type is the same for both mvl and mvr types. * gcc.dg/pr39464.c: New test. From-SVN: r194630
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gcc/testsuite/gcc.dg/pr39464.c
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