[Bug middle-end/108268] New: [13 Regression] Build failure on cross from powerpc64le-linux to nvptx-none

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108268

            Bug ID: 108268
           Summary: [13 Regression] Build failure on cross from
                    powerpc64le-linux to nvptx-none
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jakub at gcc dot gnu.org
  Target Milestone: ---

../configure --disable-bootstrap --disable-sjlj-exceptions
--enable-newlib-io-long-long
--with-build-time-tools=/builddir/build/BUILD/gcc-13.0.0-20230102/obji/usr/nvptx-none/bin
--
target nvptx-none --enable-as-accelerator-for=ppc64le-redhat-linux
--enable-languages=c,c++,fortran,lto --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --with-bugurl=
http://bugzilla.redhat.com/bugzilla --enable-checking=release
--with-system-zlib --with-gcc-major-version-only --without-isl
configured GCC ICEs on compilation of all C/C++ files.
The problem is that c_cpp_builtins function has &c_global_trees[0] value stored
in $r30
register, but when it calls
1525            int value = dwarf_reg_sizes_constant ();
the $r30 value is saved into stack frame and partially overwritten by buffer
overflow.
Before it is 0x0000000011939cb0 and after returning from that function
0x11930008.  This is because DWARF_FRAME_RETURN_COLUMN macro defaults to
DWARF_FRAME_REGISTERS, nvptx.h doesn't override it (it is a target without
register allocation nor debug info), dwarf_reg_sizes_constant allocates
343       poly_uint16 *sizes = XALLOCAVEC (poly_uint16, DWARF_FRAME_REGISTERS);
and then generate_dwarf_reg_sizes stores:
326       if (!init_state.wrote_return_column)
327         sizes[DWARF_FRAME_RETURN_COLUMN] = GET_MODE_SIZE (Pmode);