../../gcc/common/config/riscv/riscv-common.cc: In member function 'std::string
riscv_subset_list::to_string(bool, bool) const':
../../gcc/common/config/riscv/riscv-common.cc:997:37: error: 'a_subset' may be
used uninitialized [-Werror=maybe-uninitialized]
997 | if (subset_cmp (a_subse
Binutils 2.42 and before don't support Zaamo/Zalrsc. Add a configure
check to upgrade Zaamo/Zalrsc to 'a' when the assember does not support it.
This change respects Zaamo/Zalrsc when generating code.
Testcases that check for the default isa string will fail with the old binutils
since zaamo/zalr
