[flang-dev] Does LLVM/Flang support compile LAPACK now on windows?

[Jerry J via flang-dev]

*Hi Flang-Dev*

*we try to compile openblas on windows ,we use CLang64 Flang to compile but
it failed when compile LAPACK of OpenBlas. I have asked help from Openblas
communtity, and as they said:*

There are two different Flang: LLVM/Flang and Classic Flang.
The one packaged on MSYS2/clang64 is the LLVM one. which couldn't generate
binary code and is also not supported by CMake.
MSYS2/mingw-w64 doesn't have Classic Flang

so I want to make sure whether their answer is correct? thansk a lot!

it seems flang-new.exe lack cc1 tool, so I use f18,but it still failed
C:\msys64\clang64\bin>flang-new.exe -cc1
error: unknown integrated tool '-cc1'. Valid tools include '-fc1'.

C:\msys64\clang64\bin>f18.exe -cc1
Enter Fortran source
Use EOF character (^D) to end file

*Compile failure info:*
-- The Fortran compiler identification is unknown
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.3.0/../../../../x86_64-w64-mingw32/lib/../lib/libmingw32.a(lib64_libmingw32_a-crt0_c.o):
in function main':
C:/_/M/mingw-w64-crt-git/src/mingw-w64/mingw-w64-crt/crt/crt0_c.c:18:
undefined reference to WinMain'
collect2.exe: error: ld returned 1 exit status
execvp(gfortran) failed:
-- Detecting Fortran compiler ABI info
CMake Error: Error required internal CMake variable not set, cmake may not
be built correctly.
Missing variable is:
CMAKE_Fortran_PREPROCESS_SOURCE
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