Upgrade fortran compiler on Windows

[metab0t]

Comment:

Since scipy has been successfully built with flang on windows, is it possible to upgrade the fortran compiler on windows from flang 5 to flang 17?

[h-vetinari]

Currently planning / hoping to do this with flang 18 early next year

[jorisv]

Hello,

Any news on this issue ?
Right now trying to install llvm-openmp with last ipopt version fail on Windows because of conflict with openmp version needed by flang 5.

conda create -n test ipopt=3.14.16 llvm-openmp

LibMambaUnsatisfiableError: Encountered problems while solving:
  - package ipopt-3.14.16-h394f428_0 requires libflang >=5.0.0,<6.0.0.a0, but none of the providers can be installed

Could not solve for environment specs
The following packages are incompatible
├─ ipopt 3.14.16**  is not installable because it requires
│  ├─ libflang >=5.0.0,<6.0.0.a0  with the potential options
│  │  ├─ libflang 5.0.0 would require
│  │  │  └─ openmp 5.0.0 , which can be installed;
│  │  ├─ libflang 5.0.0 would require
│  │  │  └─ vc 14 , which can be installed;
│  │  └─ libflang 5.0.0 would require
│  │     ├─ openmp 5.0.0 , which can be installed;
│  │     └─ vc 14 , which can be installed;
│  ├─ mumps-seq [>=5.6.2,<5.6.3.0a0 |>=5.7.0,<5.7.1.0a0 |>=5.7.1,<5.7.2.0a0 |>=5.7.2,<5.7.3.0a0 |>=5.7.3,<5.7.4.0a0 ] but there are no viable options
│  │  ├─ mumps-seq [5.6.2|5.7.0|5.7.1] would require
│  │  │  └─ vc >=14.2,<15 , which conflicts with any installable versions previously reported;
│  │  └─ mumps-seq [5.7.2|5.7.3] would require
│  │     ├─ libflang >=5.0.0,<6.0.0.a0 , which can be installed (as previously explained);
│  │     └─ vc >=14.2,<15 , which conflicts with any installable versions previously reported;
│  └─ vc >=14.2,<15 , which conflicts with any installable versions previously reported;
└─ llvm-openmp is not installable because there are no viable options
   ├─ llvm-openmp 12.0.0 would require
   │  └─ openmp 12.0.0|12.0.0.* , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 10.0.0 would require
   │  └─ openmp 10.0.0|10.0.0.* , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 10.0.1 would require
   │  └─ openmp 10.0.1|10.0.1.* , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 11.0.0 would require
   │  └─ openmp 11.0.0|11.0.0.* , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 11.0.1 would require
   │  └─ openmp 11.0.1|11.0.1.* , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 11.1.0 would require
   │  └─ openmp 11.1.0|11.1.0.* , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 12.0.1 would require
   │  └─ openmp 12.0.1|12.0.1.* , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 13.0.1 would require
   │  └─ openmp 13.0.1|13.0.1.* , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 14.0.0 would require
   │  └─ openmp 14.0.0|14.0.0.* , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 14.0.2 would require
   │  └─ openmp 14.0.2|14.0.2.* , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 14.0.3 would require
   │  └─ openmp 14.0.3|14.0.3.* , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 14.0.4 would require
   │  └─ openmp 14.0.4|14.0.4.* , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 14.0.6 would require
   │  ├─ openmp 14.0.6|14.0.6.* , which conflicts with any installable versions previously reported;
   │  └─ vc >=14.2,<15 , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 15.0.4 would require
   │  ├─ openmp 15.0.4|15.0.4.* , which conflicts with any installable versions previously reported;
   │  └─ vc >=14.2,<15 , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 15.0.5 would require
   │  ├─ openmp 15.0.5|15.0.5.* , which conflicts with any installable versions previously reported;
   │  └─ vc >=14.2,<15 , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 8.0.0 would require
   │  └─ openmp 8.0.0|8.0.0.* , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 8.0.1 would require
   │  └─ openmp 8.0.1|8.0.1.* , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 9.0.0 would require
   │  └─ openmp 9.0.0|9.0.0.* , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 9.0.1 would require
   │  └─ openmp 9.0.1|9.0.1.* , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 15.0.6 would require
   │  ├─ openmp 15.0.6|15.0.6.* , which conflicts with any installable versions previously reported;
   │  └─ vc >=14.2,<15 , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 15.0.7 would require
   │  ├─ openmp 15.0.7|15.0.7.* , which conflicts with any installable versions previously reported;
   │  └─ vc >=14.2,<15 , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 16.0.0 would require
   │  ├─ openmp 16.0.0|16.0.0.* , which conflicts with any installable versions previously reported;
   │  └─ vc >=14.2,<15 , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 16.0.1 would require
   │  ├─ openmp 16.0.1|16.0.1.* , which conflicts with any installable versions previously reported;
   │  └─ vc >=14.2,<15 , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 16.0.2 would require
   │  ├─ openmp 16.0.2|16.0.2.* , which conflicts with any installable versions previously reported;
   │  └─ vc >=14.2,<15 , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 16.0.3 would require
   │  ├─ openmp 16.0.3|16.0.3.* , which conflicts with any installable versions previously reported;
   │  └─ vc >=14.2,<15 , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 16.0.4 would require
   │  ├─ openmp 16.0.4|16.0.4.* , which conflicts with any installable versions previously reported;
   │  └─ vc >=14.2,<15 , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 16.0.5 would require
   │  ├─ openmp 16.0.5|16.0.5.* , which conflicts with any installable versions previously reported;
   │  └─ vc >=14.2,<15 , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 16.0.6 would require
   │  ├─ openmp 16.0.6|16.0.6.* , which conflicts with any installable versions previously reported;
   │  └─ vc >=14.2,<15 , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 17.0.2 would require
   │  ├─ openmp 17.0.2|17.0.2.* , which conflicts with any installable versions previously reported;
   │  └─ vc >=14.2,<15 , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 17.0.3 would require
   │  ├─ openmp 17.0.3|17.0.3.* , which conflicts with any installable versions previously reported;
   │  └─ vc >=14.2,<15 , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 17.0.4 would require
   │  ├─ openmp 17.0.4|17.0.4.* , which conflicts with any installable versions previously reported;
   │  └─ vc >=14.2,<15 , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 17.0.5 would require
   │  ├─ openmp 17.0.5|17.0.5.* , which conflicts with any installable versions previously reported;
   │  └─ vc >=14.2,<15 , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 17.0.6 would require
   │  ├─ openmp 17.0.6|17.0.6.* , which conflicts with any installable versions previously reported;
   │  └─ vc >=14.2,<15 , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 18.1.1 would require
   │  ├─ openmp 18.1.1|18.1.1.* , which conflicts with any installable versions previously reported;
   │  └─ vc >=14.2,<15 , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 18.1.2 would require
   │  ├─ openmp 18.1.2|18.1.2.* , which conflicts with any installable versions previously reported;
   │  └─ vc >=14.2,<15 , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 18.1.3 would require
   │  ├─ openmp 18.1.3|18.1.3.* , which conflicts with any installable versions previously reported;
   │  └─ vc >=14.2,<15 , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 18.1.4 would require
   │  ├─ openmp 18.1.4|18.1.4.* , which conflicts with any installable versions previously reported;
   │  └─ vc >=14.2,<15 , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 18.1.5 would require
   │  ├─ openmp 18.1.5|18.1.5.* , which conflicts with any installable versions previously reported;
   │  └─ vc >=14.2,<15 , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 18.1.6 would require
   │  ├─ openmp 18.1.6|18.1.6.* , which conflicts with any installable versions previously reported;
   │  └─ vc >=14.2,<15 , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 18.1.7 would require
   │  ├─ openmp 18.1.7|18.1.7.* , which conflicts with any installable versions previously reported;
   │  └─ vc >=14.2,<15 , which conflicts with any installable versions previously reported;
   ├─ llvm-openmp 18.1.8 would require
   │  ├─ openmp 18.1.8|18.1.8.* , which conflicts with any installable versions previously reported;
   │  └─ vc >=14.2,<15 , which conflicts with any installable versions previously reported;
   └─ llvm-openmp 14.0.6 would require
      └─ openmp 14.0.6|14.0.6.* , which conflicts with any installable versions previously reported.

[h-vetinari]

We're not far from unblocking the whole llvm 19 stack (I had prepared everything during the RCs and before, but got some requested changes after release that I need to get to but don't have time for at the moment, as I'm travelling). Should be a matter of days or weeks

[metab0t]

@h-vetinari Is there some progress going on? I see that there is a flang-19 migration.

[h-vetinari]

There is progress, but currently things are stuck on the blas-feedstock, due to regressions in MKL. Since MKL is one of the very few packages we don't build from source, but can only get from intel, I'm dependent on them responding, which they have initially, but things move slowly unfortunately.