[Bug libffi/64572] r219477 breaks bootstrap on x86_64 darwin

["dominiq at lps dot ens.fr" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64572

--- Comment #8 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> Confirmed that the proposed patch eliminates both the bootstrap failure
> on x86_64-apple-darwin14 and the libffi testsuite failures at both -m32 and -m64.

When running

make -k -j8 check RUNTESTFLAGS="--target_board=unix'{-m32,-m64}'"

I get

        === libffi tests ===


Running target unix-m64
ERROR: couldn't load description file for unix-m64

and if I run the test in x86_64-apple-darwin14.0.0/libffi/testsuite/ with

make -k check RUNTESTFLAGS="--target_board=unix'{-m32,-m64}'"

I get

        === libffi tests ===


Running target unix/-m32
FAIL: libffi.call/cls_1_1byte.c -W -Wall -Wno-psabi -O0 output pattern test, is
12 178: 190
FAIL: libffi.call/cls_1_1byte.c -W -Wall -Wno-psabi -O2 execution test
FAIL: libffi.call/cls_1_1byte.c -W -Wall -Wno-psabi -O3 execution test
FAIL: libffi.call/cls_1_1byte.c -W -Wall -Wno-psabi -Os execution test
FAIL: libffi.call/cls_1_1byte.c -W -Wall -Wno-psabi -O2 -fomit-frame-pointer
execution test
FAIL: libffi.call/cls_2byte.c -W -Wall -Wno-psabi -O0 execution test
FAIL: libffi.call/cls_2byte.c -W -Wall -Wno-psabi -O2 execution test
FAIL: libffi.call/cls_2byte.c -W -Wall -Wno-psabi -O3 execution test
FAIL: libffi.call/cls_2byte.c -W -Wall -Wno-psabi -Os execution test
FAIL: libffi.call/cls_2byte.c -W -Wall -Wno-psabi -O2 -fomit-frame-pointer
execution test
FAIL: libffi.call/struct5.c -W -Wall -Wno-psabi -O0 execution test
FAIL: libffi.call/struct5.c -W -Wall -Wno-psabi -O2 execution test
FAIL: libffi.call/struct5.c -W -Wall -Wno-psabi -O3 execution test
FAIL: libffi.call/struct5.c -W -Wall -Wno-psabi -Os execution test
FAIL: libffi.call/struct5.c -W -Wall -Wno-psabi -O2 -fomit-frame-pointer
execution test
FAIL: libffi.call/va_struct2.c -W -Wall -Wno-psabi -O0 execution test
FAIL: libffi.call/va_struct2.c -W -Wall -Wno-psabi -O2 execution test
FAIL: libffi.call/va_struct2.c -W -Wall -Wno-psabi -O3 execution test
FAIL: libffi.call/va_struct2.c -W -Wall -Wno-psabi -Os execution test
FAIL: libffi.call/va_struct2.c -W -Wall -Wno-psabi -O2 -fomit-frame-pointer
execution test

        === libffi Summary for unix/-m32 ===

# of expected passes        1870
# of unexpected failures    20
# of unsupported tests        30

Running target unix/-m64

        === libffi Summary for unix/-m64 ===

# of expected passes        1904
# of unsupported tests        30

        === libffi Summary ===

# of expected passes        3774
# of unexpected failures    20
# of unsupported tests        60

i.e., 20 failures with -m32.