I'm just doing configure + make.  The following errors occur:


1)
In file included from ./../gdbsupport/gdb_string_view.h:49:0,
                 from ./../gdbsupport/common-utils.h:46,
                 from ./../gdbsupport/common-defs.h:125,
                 from ../gdb/nat/amd64-linux-siginfo.c:21:
./../gdbsupport/gdb_assert.h:27:33: error: static assertion failed: 
 #define gdb_static_assert(expr) static_assert (expr, "")


2)
linux-amd64-ipa.cc: In function 'const target_desc* get_ipa_tdesc(int)':
linux-amd64-ipa.cc:210:60: error: 'amd64_linux_read_description' was not declared in this scope
   return amd64_linux_read_description (idx2mask[idx], false);


3)
amd64-linux-nat.c:71:3: error: 'RAX' was not declared in this scope
   RAX * 8, RCX * 8,  /* %eax, %ecx */


4)
In file included from amd64-linux-nat.c:26:0:
amd64-linux-nat.c: In function 'ps_err_e ps_get_thread_area(ps_prochandle*, lwpid_t, int, void**)':
amd64-linux-nat.c:367:42: error: 'struct user_regs_struct' has no member named 'fs_base'
       offsetof (struct user_regs_struct, fs_base), 0);


Configuring with --target=i686-linux-gnu resolves this issue.