Hi Andrew, I just built GCC 12.2.0 with AMDGCN offloading successfully with Spack! However, when I tried to test it with an OpenACC test code that I have, I encountered the following error message:
wyp@basecamp:~/work/testcodes/f90-acc-ddot$ gfortran -fopenacc -foffload=amdgcn-unknown-amdhsa="-march=gfx900" ddot.f90 as: unrecognized option '-triple=amdgcn--amdhsa' mkoffload: fatal error: x86_64-pc-linux-gnu-accel-amdgcn-unknown-amdhsa-gcc returned 1 exit status compilation terminated. lto-wrapper: fatal error: /home/wyp/work/spack/opt/spack/linux-ubuntu20.04-zen2/gcc-12.2.0/gcc-12.2.0-w7lclfarefmge3uegn2a5vw37bnwhwto/libexec/gcc/x86_64-pc-linux-gnu/12.2.0//accel/amdgcn-unknown-amdhsa/mkoffload returned 1 exit status compilation terminated. /usr/bin/ld: error: lto-wrapper failed collect2: error: ld returned 1 exit status For reference, the target options that are recognized by llvm-mc are the following: yp@basecamp:~/work/spack/opt/spack/linux-ubuntu20.04-zen2/gcc-12.2.0/llvm-13.0.1-6zvbqlbev3wiqihvz2god7pzcptnoxu3/bin$ llvm-mc -version LLVM (http://llvm.org/): LLVM version 13.0.1 Optimized build. Default target: x86_64-unknown-linux-gnu Host CPU: znver2 Registered Targets: amdgcn - AMD GCN GPUs r600 - AMD GPUs HD2XXX-HD6XXX x86 - 32-bit X86: Pentium-Pro and above x86-64 - 64-bit X86: EM64T and AMD64 Please advise, Wil From: Wileam Yonatan Phan <wilea...@outlook.com> Sent: Tuesday, March 7, 2023 13:42 To: Andrew Stubbs <a...@codesourcery.com>; gcc@gcc.gnu.org <gcc@gcc.gnu.org> Subject: Re: Clarification on newlib version for building AMDGCN offloading backend Hi Andrew, Thanks! I've created the first draft as a GitHub PR here: <https://github.com/spack/spack/pull/35919> I think it still needs some work on the part where it builds LLVM utilities with CMake. As much as I want supporting only the newest GCC version, Spack currently supports building all stable versions of GCC from the tarballs, as well as latest develop branch, so I've enabled all versions >= 10. Thanks, Wil From: Andrew Stubbs <a...@codesourcery.com> Sent: Tuesday, March 7, 2023 10:38 To: Wileam Yonatan Phan <wilea...@outlook.com>; gcc@gcc.gnu.org <gcc@gcc.gnu.org> Subject: Re: Clarification on newlib version for building AMDGCN offloading backend On 06/03/2023 19:23, Wileam Yonatan Phan via Gcc wrote: > Hi, > > I'm working on adding a build recipe for GCC with AMDGCN offloading backend > in Spack. Can anyone clarify the following sentence listed on the wiki? > >> The Newlib version needs to be contemporaeous with GCC, at least until the >> ABI is finalized. > <https://gcc.gnu.org/wiki/Offloading#How_to_build_an_offloading-enabled_GCC> > > What are the correct contemporaneous versions for each version of GCC >= 10? Just match the dates and you'll probably be fine. We've mostly synchronised the ABI changes across the GCC mainline and the development branch precisely because the Newlib dependency is shared. Right now the required version of Newlib is 4.3.0.20230120. Prior to the ABI change a month or so ago you would have to use a Newlib snapshot. I wouldn't recommend spending very much of your valuable time on enabling old versions of these toolchains. Andrew
