Compilation error with LLVM Flang

[mmuetzel]

MSYS2 updated their LLVM compilers to version 19. I thought I'll try to build ElmerFEM with LLVM Flang again.

Compilation fails with errors like the following:
https://github.com/mmuetzel/elmerfem/actions/runs/11840878380/job/32995797740#step:7:2088

[1223/3114] Building Fortran object fhutiter/src/CMakeFiles/fhuti.dir/huti_cgs.F90.obj
FAILED: fhutiter/src/CMakeFiles/fhuti.dir/huti_cgs.F90.obj fmodules/huti_cgs.mod 
D:\a\_temp\msys64\clang64\bin\flang.exe -ID:\a\elmerfem\elmerfem\fhutiter\src -ID:/a/elmerfem/elmerfem/build -ID:/a/elmerfem/elmerfem/build/fhutiter/src -O3 -module-dirfmodules -ffixed-line-length-72 -c fhutiter/src/CMakeFiles/fhuti.dir/huti_cgs.F90-pp.f90 -o fhutiter/src/CMakeFiles/fhuti.dir/huti_cgs.F90.obj
error: loc("D:/a/elmerfem/elmerfem/fhutiter/src/huti_cgs.F90":755:7): C:/M/B/src/flang-19.1.3.src/lib/Optimizer/CodeGen/TargetRewrite.cpp:501: not yet implemented: passing argument or result on the stack in indirect calls
LLVM ERROR: aborting
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.	Program arguments: D:/a/_temp/msys64/clang64/bin/flang -fc1 -triple x86_64-w64-windows-gnu -emit-obj -I D:\\a\\elmerfem\\elmerfem\\fhutiter\\src -I D:/a/elmerfem/elmerfem/build -I D:/a/elmerfem/elmerfem/build/fhutiter/src -ffixed-line-length=72 -mrelocation-model pic -pic-level 2 -target-cpu x86-64 -fversion-loops-for-stride -module-dir fmodules -resource-dir D:/a/_temp/msys64/clang64/lib/clang/19 -mframe-pointer=none -O3 -o fhutiter/src/CMakeFiles/fhuti.dir/huti_cgs.F90.obj -x f95-cpp-input fhutiter/src/CMakeFiles/fhuti.dir/huti_cgs.F90-pp.f90

That is very likely not an issue in ElmerFEM. It is more likely just a feature that the rather new LLVM Flang doesn't support yet.

I thought I'll leave this here as an issue just to document that.
Feel free to close it if you like.