[Bug fortran/94129] Using almost any openacc !$acc directive causes ICE "compressed stream: data error"

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94129

Martin Liška <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2020-03-11
             Status|UNCONFIRMED                 |NEW

--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #1)
> You should report this to Ubuntu, I suspect a build problem there,
> eventually enabling zstd compression for gfortran-10 but zlib compression
> for gcc-10-offload-nvptx (I'm not sure we inter-operate here - Martin?)

Yes, I bet one of the compilers does not have enabled ZSTD compression.
You can see it with gcc -v:

$ gcc -v
...
Supported LTO compression algorithms: zlib zstd
gcc version 10.0.1 20200310 (experimental) (GCC) 

Right now we should catch different compression algorithm:

void
lto_end_uncompression (struct lto_compression_stream *stream,
                       lto_compression compression)
{
#ifdef HAVE_ZSTD_H
  if (compression == ZSTD)
    {
      lto_uncompression_zstd (stream);
      return;
    }
#endif
  if (compression == ZSTD)
    internal_error ("compiler does not support ZSTD LTO compression");

  lto_uncompression_zlib (stream);
}