+ if (h->root.type == bfd_link_hash_undefweak
+ && (relax_func == _bfd_riscv_relax_lui
+ || relax_func == _bfd_riscv_relax_pc))
+ {
+ /* For the lui and auipc relaxations, since the symbol
+ value of an undefined weak symbol is always be zero,
+ we can optimize the patterns into a single LI/MV/ADDI
+ instruction.
+
+ Note that, creating shared libraries and pie output may
+ break the rule above. Fortunately, since we do not relax
+ pc relocs when creating shared libraries and pie output,
+ and the absolute address access for R_RISCV_HI20 isn't
+ allowed when "-fPIC" is set, the problem of creating shared
+ libraries can not happen currently. Once we support the
+ auipc relaxations when creating shared libraries, then we will
+ need the more rigorous checking for this optimization. */
+ undefined_weak = TRUE;
+ }
+