[Bug fortran/65089] New: FAIL: gfortran.dg/io_real_boz(2|_[45]).f90 when tested with -fsanitize=address

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65089

            Bug ID: 65089
           Summary: FAIL: gfortran.dg/io_real_boz(2|_[45]).f90 when tested
                    with -fsanitize=address
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dominiq at lps dot ens.fr

I have tested gfortran with

make -k check-gfortran
RUNTESTFLAGS="--target_board=unix'{-m32/-fsanitize=address,-m64/-fsanitize=address}'"

for 95 unexpected failures for -m32 or -m64 (well below what I anticipated!-).

I indeed see pr60576 (assumed_rank_7.f90), pr64921 (class_allocate_18.f90), and
pr64986 (class_to_type_4.f90). I also see 40+ failures associated with scan-*
which are probably expected: -fsanitize=address may change optimizations.
Finally (this PR) the tests gfortran.dg/io_real_boz(2|_[45]).f90 give outputs
of the kind

=================================================================
==24090==ERROR: AddressSanitizer: global-buffer-overflow on address
0x00010c37ce04 at pc 0x00010c3948c8 bp 0x7fff53882e40 sp 0x7fff538825f0
READ of size 3 at 0x00010c37ce04 thread T0
    #0 0x10c3948c7  (/opt/gcc/gcc4.10w/lib/libasan.2.dylib+0x138c7)
    #1 0x10d15f1c5  (/opt/gcc/gcc4.10w/lib/libgfortran.3.dylib+0xc01c5)
    #2 0x10c37cd9f 
(/Users/dominiq/Documents/Fortran/g95bench/win/f90/bug/a.out+0x100000d9f)

0x00010c37ce04 is located 60 bytes to the left of global variable '*LC4'
defined in '/opt/gcc/_clean/gcc/testsuite/gfortran.dg/io_real_boz_5.f90'
(0x10c37ce40) of size 1
0x00010c37ce04 is located 0 bytes to the right of global variable '*LC3'
defined in '/opt/gcc/_clean/gcc/testsuite/gfortran.dg/io_real_boz_5.f90'
(0x10c37ce00) of size 4
...