Customize gcc for p extension

[quannh41-git]

Hi linsinan,

I am a newbie in gcc toolchain. I have found your repo about adding RISC-V P extension and I want to customize my toolchain. I start to follow you with riscv-gcc/gcc/config/riscv directory and modify some files to add "add8" instruction. However, when I built toolchain, I failed on stage 1. This was failed due to error "cannot compute suffix of object files", so recipe for target configure-target-libgcc failed.

I dont know why?

Could you share me some steps to add instructions of P-extension to GCC?

Thank you.

[linsinan1995]

I haven't encountered this error before. Did you use the riscv-toolchain to build and did you use the wrong configuration (see https://gcc.gnu.org/wiki/FAQ#configure_suffix)?

[quannh41-git]

Hi Lin Sinan,

I have use your riscv-binutils (support p extension) and riscv-gcc (version 10.2) within riscv-toolchain that you mentioned above to build toolchain. I use this toolchain to compile some instructions of P such as add8.S, add16.S, ... and they can compile it smoothly to binary file.
But I dont know why riscv-gcc (v10.2) not support p extension can compile instructions of P extension?

Thank you!

[ByeBeihai]

Hi Lin Sinan,

I have use your riscv-binutils (support p extension) and riscv-gcc (version 10.2) within riscv-toolchain that you mentioned above to build toolchain. I use this toolchain to compile some instructions of P such as add8.S, add16.S, ... and they can compile it smoothly to binary file. But I dont know why riscv-gcc (v10.2) not support p extension can compile instructions of P extension?

Thank you!

hello, I meet the same problem of you. Could you please share your solution or compiled toolchain? I have no idea about where to find the "riscv-binutils(support p extension)".
thanks a lot!