Since SPEC 2017 consists of quite a lot of benchmarks, for this initial report I looked at exchange2 and bwaves_r benchmarks.

Minimum version of Fortran required using gfortran: F95
How to compile with gfortran:
The exchange2 benchmark consists of a single Fortran file.
1. First cd to the benchmark with:
```
cd benchspec/CPU/548.exchange2_r/src
```
1. Now you can compile the project by running:
```
gfortran exchange2.F90
```
Does it compile with flang-new: Yes
Similarly, to compiling with gfortran, you can compile with flang-new with:
```
flang-new exchange2.F90
```

Minimum version of Fortran required using gfortran: F95
How to compile with gfortran:
The exchange2 benchmark consists of a single Fortran file.
1. First cd to the benchmark with:
```
cd benchspec/CPU/503.bwaves_r/src
```
1. Now you can compile the project by running:
```
gfortran -DSPEC -DSPEC_SUPPRESS_OPENMP block_solver.F flow_lam.F flux_lam.F jacobian_lam.F shell_lam.F fill1.F fill2.F
```
If you want to compile with OpenMP then replace "-DSPEC_SUPPRESS_OPENMP" from above with "-D_OPENMP -fopenmp".
Does it compile with flang-new: Yes
To compile with flang-new you must have a build of PGMATH. I use classic flang to get a build of PGMATH. Then you can compile with flang-new with:
```
flang-new -w -DSPEC -DSPEC_SUPPRESS_OPENMP -L/path/to/flang/runtime/build/lib -lpgmath block_solver.F flow_lam.F flux_lam.F jacobian_lam.F shell_lam.F fill1.F fill2.F
```
Where the path to your PGMATH build lib directory is correctly modified.
Again, like gfortran, if you want to compile with OpenMP then replace -DSPEC_SUPPRESS_OPENMP from above with -D_OPENMP -fopenmp. However, I found that when compiling with OpenMP, I end up getting a stack dump. I think this may be a lowering issue, but I am not sure. A small reproducer of code based of bwaves_r causing the error is:
```
integer :: i,j,k,l
real :: r2 = 0.0
!$OMP PARALLEL DO PRIVATE(l,i,j,k) REDUCTION(+:r2) 
do l=1,nb
    r2 =r(l,i,j,k)**2
enddo
!$OMP END PARALLEL DO
end
```

Spec-2017 #1476

Description