[Bug go/107992] New: m68k-linux-gnu bootstap error in gofrontend

[Bug go/107992] New: m68k-linux-gnu bootstap error in gofrontend

[bernd.edlinger at hotmail dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107992

            Bug ID: 107992
           Summary: m68k-linux-gnu bootstap error in gofrontend
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: go
          Assignee: ian at airs dot com
          Reporter: bernd.edlinger at hotmail dot de
  Target Milestone: ---

Hi, I don't know if that is expected,
but I got a boot-strap error with r13-4502-ga0ee2e52252
.../configure --target=m68k-linux-gnu --prefix=... --enable-languages=all

libtool: compile:  /home/ed/gnu/gcc-build-m68k/./gcc/gccgo
-B/home/ed/gnu/gcc-build-m68k/./gcc/
-B/home/ed/gnu/m68k-linux-gnu/m68k-linux-gnu/bin/
-B/home/ed/gnu/m68k-linux-gnu/m68k-linux-gnu/lib/ -isystem
/home/ed/gnu/m68k-linux-gnu/m68k-linux-gnu/include -isystem
/home/ed/gnu/m68k-linux-gnu/m68k-linux-gnu/sys-include -O2 -g -mcpu=68040 -I .
-c -fgo-pkgpath=image/color/palette
../../../../gcc-trunk/libgo/go/image/color/palette/generate.go
../../../../gcc-trunk/libgo/go/image/color/palette/palette.go  -fPIC -o
image/color/.libs/palette.o
go1: internal compiler error: in set_from, at go/gofrontend/types.cc:2851
0x692aaf Ptrmask::set_from(Gogo*, Type*, long, long)
        ../../gcc-trunk/gcc/go/gofrontend/types.cc:2851
0x92f9a0 Ptrmask::set_from(Gogo*, Type*, long, long)
        ../../gcc-trunk/gcc/go/gofrontend/types.cc:2825
0x92f9a0 Ptrmask::set_from(Gogo*, Type*, long, long)
        ../../gcc-trunk/gcc/go/gofrontend/types.cc:2884
0x92fdcb Ptrmask::set_from(Gogo*, Type*, long, long)
        ../../gcc-trunk/gcc/go/gofrontend/types.cc:2825
0x92fdcb Type::gc_ptrmask_var(Gogo*, long, long)
        ../../gcc-trunk/gcc/go/gofrontend/types.cc:3030
0x930b09 Type::make_gc_symbol_var(Gogo*)
        ../../gcc-trunk/gcc/go/gofrontend/types.cc:2710
0x930c9a Type::gc_symbol_pointer(Gogo*)
        ../../gcc-trunk/gcc/go/gofrontend/types.cc:2660
0x88290a Struct_construction_expression::do_get_backend(Translate_context*)
        ../../gcc-trunk/gcc/go/gofrontend/expressions.cc:15689
0x88290a Struct_construction_expression::do_get_backend(Translate_context*)
        ../../gcc-trunk/gcc/go/gofrontend/expressions.cc:15689
0x92973c Type::make_type_descriptor_var(Gogo*)
        ../../gcc-trunk/gcc/go/gofrontend/types.cc:1432
0x929cad Type::type_descriptor_pointer(Gogo*, Location)
        ../../gcc-trunk/gcc/go/gofrontend/types.cc:1308
0x8befdd Named_object::get_backend(Gogo*, std::vector<Bexpression*,
std::allocator<Bexpression*> >&, std::vector<Btype*, std::allocator<Btype*> >&,
std::vector<Bfunction*, std::allocator<Bfunction*> >&)
        ../../gcc-trunk/gcc/go/gofrontend/gogo.cc:8868
0x8c80f9 Gogo::write_globals()
        ../../gcc-trunk/gcc/go/gofrontend/gogo.cc:1560
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
make[8]: *** [Makefile:3043: runtime.lo] Error 1
make[8]: *** Waiting for unfinished jobs....

[Bug go/107992] m68k-linux-gnu bootstap error in gofrontend

[ian at airs dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107992

--- Comment #1 from Ian Lance Taylor <ian at airs dot com> ---
Thanks.  This is happening because the data structures that Go's garbage
collector uses require that all pointers be aligned on their natural
boundaries.  Unfortunately m68k only provides 2-byte alignment for 4-byte
pointers, not 4-byte alignment.  I don't know if there will be a simple fix. 
We could probably adjust the alignment for data structures defined in Go, which
would fix this case, but that wouldn't help with C interoperability.