Script to build gcc with OpenMP offloading to Nvidia devices (via nvptx)

build-gcc-offload-nvptx.sh

#!/bin/bash

#
# Build GCC with support for offloading to NVIDIA GPUs.
#

set -o nounset -o errexit

# Location of the installed CUDA toolkit
cuda=/usr/local/cuda


# directory of this script
MYDIR="$( cd -P "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"

work_dir=$MYDIR/gcc-offload
install_dir=$work_dir/install

rm -rf $work_dir

# Build assembler and linking tools
mkdir -p $work_dir
cd $work_dir
git clone https://github.com/MentorEmbedded/nvptx-tools
cd nvptx-tools
./configure \
	--with-cuda-driver-include=$cuda/include \
	--with-cuda-driver-lib=$cuda/lib64 \
	--prefix=$install_dir
make
make install
cd ..


# Set up the GCC source tree
git clone https://github.com/MentorEmbedded/nvptx-newlib
wget -c http://gnu.mirror.globo.tech/gcc/gcc-7.3.0/gcc-7.3.0.tar.gz
tar xf gcc-7.3.0.tar.gz
cd gcc-7.3.0
contrib/download_prerequisites
ln -s ../nvptx-newlib/newlib newlib
target=$(./config.guess)
cd ..


# Build nvptx GCC
mkdir build-nvptx-gcc
cd build-nvptx-gcc
../gcc-7.3.0/configure \
	--target=nvptx-none \
	--with-build-time-tools=$install_dir/nvptx-none/bin \
	--enable-as-accelerator-for=$target \
	--disable-sjlj-exceptions \
	--enable-newlib-io-long-long \
	--enable-languages="c,c++,fortran,lto" \
	--prefix=$install_dir
make -j4
make install
cd ..


# Build host GCC
mkdir build-host-gcc
cd  build-host-gcc
../gcc-7.3.0/configure \
	--enable-offload-targets=nvptx-none \
	--with-cuda-driver-include=$cuda/include \
	--with-cuda-driver-lib=$cuda/lib64 \
	--disable-bootstrap \
	--disable-multilib \
	--enable-languages="c,c++,fortran,lto" \
	--prefix=$install_dir
make -j4
make install
cd .. 

Is it possible to modify this script for Windows?

I’m not familiar with doing this on windows, unfortunately.

hello
i installed gcc+nvptx using your script.
gcc compiler was installed normally, and I tried to compile a simple openACC FORTRAN program with gfortran.
but i get following errors:

gfortran -O3 -fopenacc -ffree-line-length-none -foffload=nvptx-none -c global_parameters_mod.F90
gfortran -O3 -fopenacc -ffree-line-length-none -foffload=nvptx-none -c argument_mod.F90
gfortran -O3 -fopenacc -ffree-line-length-none -foffload=nvptx-none -c kind_params_mod.f90
gfortran -O3 -fopenacc -ffree-line-length-none -foffload=nvptx-none -c gocean_mod.F90
gfortran -O3 -fopenacc -ffree-line-length-none -foffload=nvptx-none -c region_mod.f90
gfortran -O3 -fopenacc -ffree-line-length-none -foffload=nvptx-none -c grid_mod.f90
gfortran -O3 -fopenacc -ffree-line-length-none -foffload=nvptx-none -c kernel_mod.F90
gfortran -O3 -fopenacc -ffree-line-length-none -foffload=nvptx-none -c halo_mod.f90
gfortran -O3 -fopenacc -ffree-line-length-none -foffload=nvptx-none -c field_mod.f90
ar rv gocean_api.a argument_mod.o kind_params_mod.o global_parameters_mod.o gocean_mod.o grid_mod.o kernel_mod.o halo_mod.o field_mod.o region_mod.o
ar: creating gocean_api.a
a - argument_mod.o
a - kind_params_mod.o
a - global_parameters_mod.o
a - gocean_mod.o
a - grid_mod.o
a - kernel_mod.o
a - halo_mod.o
a - field_mod.o
a - region_mod.o
make[2]: Leaving directory '/data1/home/synim/test/nemolite2d_edata/api_v1.0'
gfortran -O3 -fopenacc -ffree-line-length-none -foffload=nvptx-none -I../../api_v1.0 -I/src -c nemolite2d.f90
f951: Warning: Nonexistent include directory ‘/src’ [-Wmissing-include-dirs]
gfortran -o nemolite2d.exe nemolite2d.o ../../api_v1.0/gocean_api.a  -lgfortran -lasan -latomic -lgomp
unresolved symbol sin
collect2: error: ld returned 1 exit status
mkoffload: fatal error: x86_64-pc-linux-gnu-accel-nvptx-none-gcc returned 1 exit status
compilation terminated.
lto-wrapper: fatal error: /data1/home/synim/offload/install/libexec/gcc/x86_64-pc-linux-gnu/11.3.1//accel/nvptx-none/mkoffload returned 1 exit status
compilation terminated.
/opt/rh/devtoolset-7/root/usr/bin/ld: error: lto-wrapper failed
collect2: error: ld returned 1 exit status
make[1]: *** [Makefile:40: nemolite2d.exe] Error 1
make[1]: Leaving directory '/data1/home/synim/test/nemolite2d_edata/nemolite2d_serial/nemolite2d_orig'
make: *** [Makefile:24: nemolite2d] Error 2

Anyone who knows about this issue, please help.
thanks.

Anyone who knows about this issue, please help. thanks.

This script is for OpenMP offloading support, I haven't tested it with OpenAcc at all.

Hello,

I have tried to launch your script and everything passes except for the make of the Build Host GCC.
I have the following error:

make[3]: *** [Makefile:539 : sanitizer_platform_limits_posix.lo] Erreur 1 make[3] : on quitte le répertoire « /DISK4/offload/build-host-gcc/x86_64-pc-linux-gnu/libsanitizer/sanitizer_common » make[2]: *** [Makefile:472 : install-recursive] Erreur 1 make[2] : on quitte le répertoire « /DISK4/offload/build-host-gcc/x86_64-pc-linux-gnu/libsanitizer » make[1]: *** [Makefile:12708 : install-target-libsanitizer] Erreur 2 make[1] : on quitte le répertoire « /DISK4/offload/build-host-gcc » make: *** [Makefile:2301 : install] Erreur 2
It's written in French but you can see the libraries that cause the errors.

Thanks,

Hello，
Is there any GPU version requirement for this, I mean for arithmetic or architectural requirements, etc.?
Thanks,

Hello， Is there any GPU version requirement for this, I mean for arithmetic or architectural requirements, etc.? Thanks,

I don't know - it must depend on gcc version etc.