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* configure.ac: Tidy target case.
(HAVE_LONG_DOUBLE): Allow the target to override.
* configure: Regenerate.
* include/ffi.h.in: Don't define ffi_type_foo if
LIBFFI_HIDE_BASIC_TYPES is defined.
(ffi_type_longdouble): If not HAVE_LONG_DOUBLE, define
to ffi_type_double.
* types.c (LIBFFI_HIDE_BASIC_TYPES): Define.
(FFI_TYPEDEF, ffi_type_void): Mark the data const.
(ffi_type_longdouble): Special case for Alpha. Don't define
if long double == double.
* src/alpha/ffi.c (FFI_TYPE_LONGDOUBLE): Assert unique value.
(ffi_prep_cif_machdep): Handle it as the 128-bit type.
(ffi_call, ffi_closure_osf_inner): Likewise.
(ffi_closure_osf_inner): Likewise. Mark hidden.
(ffi_call_osf, ffi_closure_osf): Mark hidden.
* src/alpha/ffitarget.h (FFI_LAST_ABI): Tidy definition.
* src/alpha/osf.S (ffi_call_osf, ffi_closure_osf): Mark hidden.
(load_table): Handle 128-bit long double.
* testsuite/libffi.call/float4.c: Add -mieee for alpha.
From-SVN: r123622
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