LLVMFlang 18.0 adds MSVC runtime library selection flags and associated
Fortran runtime library variants. Resolve the corresponding FIXME left
by commit 26bf32cdc6 (LLVMFlang: Add support for targeting MSVC ABI on
Windows, 2023-09-28, v3.28.0-rc1~10^2).
Issue: #24840
In commit 26bf32cdc6 (LLVMFlang: Add support for targeting MSVC ABI on
Windows, 2023-09-28, v3.28.0-rc1~10^2) we incorrectly recorded `-g` as
supporting the `ProgramDatabase` format, but it is actually `Embedded`,
matching Clang.
In order to support easy integration with C and C++ projects that use
the `.pdb` debug formats, pretend LLVMFlang supports them and just don't
actually emit any debug information.
Issue: #24840
The compiler does not yet support everything needed to integrate well
with the MSVC ABI, in particular for runtime library selection and debug
format selection. Document them in FIXME comments and leave this
support undocumented by CMake for now.
Fixes: #24840
Inspired-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Alex Turbov