Re: [Patch, aarch64, middle-end\ v4: Move pair_fusion pass from aarch64 to middle-end

[Marc Poulhiès]

Hello,

I can't bootstrap using gcc 5.5 since this change. It fails with:

.../gcc/pair-fusion.cc: In member function ‘bool 
pair_fusion_bb_info::fuse_pair(bool, unsigned int, int, rtl_ssa::insn_info*, 
rtl_ssa::in
sn_info*, base_cand&, const rtl_ssa::insn_range_info&)’:
.../gcc/pair-fusion.cc:1790:40: error: ‘writeback’ is not a class, namespace, 
or enumeration
   if (m_pass->should_handle_writeback (writeback::ALL)
                                        ^
Is it possible that C++11 enum classes are not correctly supported in
older GCC?

Thanks,
Marc