[Bug target/65261] New: [5 Regression] bootstrap-ubsan ppc64le: gcc/libcpp/lex.c:552:30: runtime error: load of misaligned address 0x01002172dfc6 for type 'const uchar', which requires 16 byte alignment

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65261

            Bug ID: 65261
           Summary: [5 Regression] bootstrap-ubsan ppc64le:
                    gcc/libcpp/lex.c:552:30: runtime error: load of
                    misaligned address 0x01002172dfc6 for type 'const
                    uchar', which requires 16 byte alignment
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: trippels at gcc dot gnu.org
                CC: wschmidt at gcc dot gnu.org
            Blocks: 63426
              Host: powerpc64le-unknown-linux-gnu
            Target: powerpc64le-unknown-linux-gnu
             Build: powerpc64le-unknown-linux-gnu

Starting with r215873 I get many "load of misaligned address" runtime errors
in lex.c:552:30 during --with-build-config=bootstrap-ubsan:

../../gcc/libcpp/lex.c:552:30: runtime error: load of misaligned address
0x01001f31d37a for type 'const uchar', which requires 16 byte alignment
0x01001f31d37a: note: pointer points here
 6e 63  2e 0a 20 20 20 54 68 69  73 20 66 69 6c 65 20 69  73 20 70 61 72 74 20
6f  66 20 74 68 65 20
              ^