Re: [PATCH] RISC-V: Add RTL pass to combine cm.popret with zero return value

[Kito Cheng]

> diff --git a/gcc/common/config/riscv/Makefile 
> b/gcc/common/config/riscv/Makefile
> new file mode 100644
> index 00000000000..471dcc9faed
> --- /dev/null
> +++ b/gcc/common/config/riscv/Makefile
> @@ -0,0 +1,10 @@
> +all: riscv-arch-canonicalize
> +
> +riscv-arch-canonicalize: riscv-arch-canonicalize.o riscv-extensions.o
> +       $(CXX) riscv-arch-canonicalize.o riscv-extensions.o -o 
> riscv-arch-canonicalize
> +
> +riscv-arch-canonicalize.o: riscv-arch-canonicalize.cc
> +       $(CXX) -I ../../../ -DSTANDALONG_COMPLIE_RV_EXT -std=c++14 -Wall 
> -Wextra -Werror -Wno-error=unused-parameter -pedantic -O2 -g -c 
> riscv-arch-canonicalize.cc
> +
> +riscv-extensions.o: riscv-extensions.cc
> +       $(CXX) -I ../../../ -DSTANDALONG_COMPLIE_RV_EXT -std=c++14 -Wall 
> -Wextra -Werror -Wno-error=unused-parameter -pedantic -O2 -g -c 
> riscv-extensions.cc

^^^^ Above changes are some other experimental stuff mixed in, please
ignore those when you review that ...