[Bug libgomp/94612] New: Failed to build simple examples with offloading.

["chinoune.mehdi at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94612

            Bug ID: 94612
           Summary: Failed to build simple examples with offloading.
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libgomp
          Assignee: unassigned at gcc dot gnu.org
          Reporter: chinoune.mehdi at hotmail dot com
                CC: jakub at gcc dot gnu.org
  Target Milestone: ---

$cat prod.f90
program main
  implicit none
  integer, parameter :: sp = selected_real_kind(6,37)
  integer, parameter :: n = 4096
  real(sp), allocatable :: a(:), b(:), c(:), c2(:)
  integer :: i

  allocate( a(n), b(n), c(n) )

  c = 0._sp
  call random_number(a)
  call random_number(b)

  !$omp target teams map(to: a, b) map(from: c)
  !$omp distribute parallel do
  do i = 1, n
    c(i) = a(i)*b(i)
  end do
  !$omp end target teams

  c2 = a*b

  print*, maxval( abs(c2-c) )

end program

$ gfortran-10 prod.f90 -fopenmp -foffload=nvptx-none -o test.x
lto1: internal compiler error: compressed stream: data error
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.
mkoffload: fatal error: x86_64-linux-gnu-accel-nvptx-none-gcc-10 returned 1
exit status
compilation terminated.
lto-wrapper: fatal error:
/usr/lib/gcc/x86_64-linux-gnu/10//accel/nvptx-none/mkoffload returned 1 exit
status
compilation terminated.
/usr/bin/ld: error: lto-wrapper failed
collect2: error: ld returned 1 exit status

System: Ubuntu 20.04 x86_64

$ gcc-10 -v
Using built-in specs.
COLLECT_GCC=gcc-10
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/10/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa:hsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
10-20200411-0ubuntu1' --with-bugurl=file:///usr/share/doc/gcc-10/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,m2 --prefix=/usr
--with-gcc-major-version-only --program-suffix=-10
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new
--enable-gnu-unique-object --disable-vtable-verify --enable-plugin
--enable-default-pie --with-system-zlib --enable-libphobos-checking=release
--with-target-system-zlib=auto --enable-objc-gc=auto --enable-multiarch
--disable-werror --with-arch-32=i686 --with-abi=m64
--with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic
--enable-offload-targets=nvptx-none,amdgcn-amdhsa,hsa --without-cuda-driver
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 10.0.1 20200411 (experimental) [master revision
bb87d5cc77d:75961caccb7:f883c46b4877f637e0fa5025b4d6b5c9040ec566] (Ubuntu
10-20200411-0ubuntu1)