[Bug libstdc++/28290] New: [4.2 Regression] ICE during extc++.h pch generation on Tru64 UNIX V5.1B

Thu Jul 6 20:00:00 GMT 2006

Bootstrapping current mainline as of 20060705 fails on Tru64 UNIX V5.1B
when trying to genererate the PCH file for extc++.h:

        /vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/./gcc/xgcc -shared-libgcc
-B/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/./gcc -nostdinc++
-L/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/src
-L/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/src/.libs
-B/vol/gcc/share/alpha-dec-osf5.1b/bin/ -B/vol/gcc/share/alpha-dec-osf5.1b/lib/
-isystem /vol/gcc/share/alpha-dec-osf5.1b/include -isystem
/vol/gcc/share/alpha-dec-osf5.1b/sys-include -Winvalid-pch -Wno-deprecated -x
c++-header -g -O2  -mieee
-I/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/alpha-dec-osf5.1b
-I/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include
-I/vol/gccsrc/src/gcc/libstdc++-v3/libsupc++
/vol/gccsrc/src/gcc/libstdc++-v3/include/precompiled/extc++.h -O2 -g -o
./alpha-dec-osf5.1b/bits/extc++.h.gch/O2g.gch; 
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:57:
error: 'iconv_t' does not name a type
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:67:
error: 'descriptor_type' does not name a type
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:70:
error: 'descriptor_type' does not name a type
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:147:
error: ISO C++ forbids declaration of 'descriptor_type' with no type
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:147:
error: expected ';' before '&' token
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:151:
error: expected `;' before 'const'
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:151:
error: ISO C++ forbids declaration of 'descriptor_type' with no type
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:151:
error: expected ';' before '&' token
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:155:
error: expected `;' before 'protected'
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:
In constructor '__gnu_cxx::encoding_state::encoding_state()':
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:86:
error: class '__gnu_cxx::encoding_state' does not have any field named
'_M_in_desc'
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:86:
error: class '__gnu_cxx::encoding_state' does not have any field named
'_M_out_desc'
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:
In constructor '__gnu_cxx::encoding_state::encoding_state(const char*, const
char*, int, int, int)':
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:92:
error: class '__gnu_cxx::encoding_state' does not have any field named
'_M_in_desc'
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:92:
error: class '__gnu_cxx::encoding_state' does not have any field named
'_M_out_desc'
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:
In copy constructor '__gnu_cxx::encoding_state::encoding_state(const
__gnu_cxx::encoding_state&)':
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:104:
error: class '__gnu_cxx::encoding_state' does not have any field named
'_M_in_desc'
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:104:
error: class '__gnu_cxx::encoding_state' does not have any field named
'_M_out_desc'
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:
In member function 'bool __gnu_cxx::encoding_state::good() const':
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:121:
error: 'descriptor_type' does not name a type
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:122:
error: '_M_in_desc' was not declared in this scope
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:122:
error: '__err' was not declared in this scope
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:123:
error: '_M_out_desc' was not declared in this scope
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:
In member function 'void __gnu_cxx::encoding_state::init()':
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:159:
error: 'descriptor_type' does not name a type
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:161:
error: '_M_in_desc' was not declared in this scope
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:163:
error: 'iconv_open' was not declared in this scope
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:164:
error: '__err' was not declared in this scope
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:168:
error: '_M_out_desc' was not declared in this scope
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:170:
error: 'iconv_open' was not declared in this scope
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:171:
error: '__err' was not declared in this scope
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:
In member function 'void __gnu_cxx::encoding_state::destroy()':
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:192:
error: 'descriptor_type' does not name a type
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:193:
error: '_M_in_desc' was not declared in this scope
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:193:
error: '__err' was not declared in this scope
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:195:
error: 'iconv_close' was not declared in this scope
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:198:
error: '_M_out_desc' was not declared in this scope
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:198:
error: '__err' was not declared in this scope
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:200:
error: 'iconv_close' was not declared in this scope
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:
At global scope:
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:237:
error: 'descriptor_type' in class '__gnu_cxx::encoding_state' does not name a
type
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:296:
error: 'std::__iconv_adaptor' declared as an 'inline' variable
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:296:
error: template declaration of 'size_t std::__iconv_adaptor'
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:296:
error: '__func' was not declared in this scope
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:296:
error: 'iconv_t' was not declared in this scope
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:296:
error: expected primary-expression before ',' token
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:296:
error: expected primary-expression before '*' token
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:296:
error: expected primary-expression before ',' token
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:296:
error: expected primary-expression before 'char'
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:296:
error: expected primary-expression before '*' token
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:296:
error: expected primary-expression before ')' token
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:296:
error: '(size_t)(<expression error>)' cannot be used as a function
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:297:
error: 'iconv_t' was not declared in this scope
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:297:
error: expected primary-expression before 'char'
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:297:
error: expected primary-expression before '*' token
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:297:
error: '__inbytes' was not declared in this scope
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:298:
error: expected primary-expression before 'char'
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:298:
error: expected primary-expression before '*' token
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:298:
error: '__outbytes' was not declared in this scope
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:
In member function 'virtual std::codecvt_base::result std::codecvt<_InternT,
_ExternT, __gnu_cxx::encoding_state>::do_out(__gnu_cxx::encoding_state&, const
_InternT*, const _InternT*, const _InternT*&, _ExternT*, _ExternT*, _ExternT*&)
const':
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:312:
error: expected initializer before '&' token
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:338:
error: 'iconv' was not declared in this scope
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:338:
error: '__desc' was not declared in this scope
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:339:
error: there are no arguments to '__iconv_adaptor' that depend on a template
parameter, so a declaration of '__iconv_adaptor' must be available
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:339:
error: (if you use '-fpermissive', G++ will accept your code, but allowing the
use of an undeclared name is deprecated)
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:345:
error: 'iconv' was not declared in this scope
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:345:
error: '__desc' was not declared in this scope
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:346:
error: there are no arguments to '__iconv_adaptor' that depend on a template
parameter, so a declaration of '__iconv_adaptor' must be available
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:
In member function 'virtual std::codecvt_base::result std::codecvt<_InternT,
_ExternT, __gnu_cxx::encoding_state>::do_unshift(__gnu_cxx::encoding_state&,
_ExternT*, _ExternT*, _ExternT*&) const':
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:379:
error: expected initializer before '&' token
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:386:
error: 'iconv' was not declared in this scope
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:386:
error: '__desc' was not declared in this scope
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:387:
error: there are no arguments to '__iconv_adaptor' that depend on a template
parameter, so a declaration of '__iconv_adaptor' must be available
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:
In member function 'virtual std::codecvt_base::result std::codecvt<_InternT,
_ExternT, __gnu_cxx::encoding_state>::do_in(__gnu_cxx::encoding_state&, const
_ExternT*, const _ExternT*, const _ExternT*&, _InternT*, _InternT*, _InternT*&)
const':
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:416:
error: expected initializer before '&' token
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:442:
error: 'iconv' was not declared in this scope
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:442:
error: '__desc' was not declared in this scope
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:443:
error: there are no arguments to '__iconv_adaptor' that depend on a template
parameter, so a declaration of '__iconv_adaptor' must be available
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:449:
error: 'iconv' was not declared in this scope
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:449:
error: '__desc' was not declared in this scope
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/codecvt_specializations.h:450:
error: there are no arguments to '__iconv_adaptor' that depend on a template
parameter, so a declaration of '__iconv_adaptor' must be available
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/pb_ds/detail/binary_heap_/binary_heap_.hpp:
At global scope:
/vol/gccsrc/obj/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include/ext/pb_ds/detail/binary_heap_/binary_heap_.hpp:235:
internal compiler error: tree check: expected integer_cst, have scope_ref in
tree_int_cst_sgn, at tree.c:4476
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.
checking for ctime... make[2]: *** [alpha-dec-osf5.1b/bits/extc++.h] Error 1
make[2]: Leaving directory
`/amnt/sequoia/export/vol/gcc/obj/alpha/gcc-4.2.0-20060705/5.1b-gcc/alpha-dec-osf5.1b/libstdc++-v3/include'

The problem starts with the fact that there's no definition of iconv_t in
place, since iconv.h isn't included anywhere.  I haven't yet found where in
the maze of libstdc++ headers to add this.  One plausible location seemed
to be config/locale/generic/c_locale.h, but this didn't help.

Apart from that, there shouldn't be an ICE here.

Environment:
System: OSF1 bartok V5.1 2650 alpha
Machine: alpha

host: alpha-dec-osf5.1b
build: alpha-dec-osf5.1b
target: alpha-dec-osf5.1b
configured with: /vol/gcc/src/gcc/configure --prefix=/vol/gcc
--with-local-prefix=/vol/gcc --disable-nls --host alpha-dec-osf5.1b --build
alpha-dec-osf5.1b --target alpha-dec-osf5.1b
--with-gmp-dir=/vol/gnu/obj/gmp-4.1.3
--with-mpfr-dir=/vol/gnu/obj/gmp-4.1.3/mpfr
--enable-languages=c,c++,fortran,java,objc,ada --disable-libmudflap

How-To-Repeat:
Bootstrap mainline as described above.

-- 
           Summary: [4.2 Regression] ICE during extc++.h pch generation on
                    Tru64 UNIX V5.1B
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: critical
          Priority: P2
         Component: libstdc++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ro at techfak dot uni-bielefeld dot de
 GCC build triplet: alpha-dec-osf5.1b
  GCC host triplet: alpha-dec-osf5.1b
GCC target triplet: alpha-dec-osf5.1b

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28290