[flang-dev] flang test questions

[Andrzej Warzynski via flang-dev]

Hi Damian,

On 13/07/2021 20:06, Damian Rouson via flang-dev wrote:
> Second, I was informed in April that the f18-llvm-project fork's fir-dev 
> branch is able to produce executable files from Fortran 77 source.
> Could someone explain how to use this capability and whether this 
> capability has been merged upstream to the llvm-project repository?

Merging this upstream is an ongoing process. I am not active in this 
area so can't comment on timescales, but it is one of our main 
challenges right now.

As for compiling with the fir-dev branch on f18-llvm-project, we have 
been recently discussing this on flang-compiler.slack.com. Are you 
active there? I can send you an invite.

> Do I need to pass a flag 
> to tell flang to produce an executable program without invoking gfortran?

`flang` that you are referring to is just a bash wrapper script [1] that 
was added for experimenting. It will only use LLVM Flang to 
parse-unparse the input source, and then will call e.g. `gfortran` for 
code-generation. You can replace `gfortran` with some other Fortran 
compiler. The name is rather confusing. We should rename it as 
`flang-to-gnu` or something similar.

Welcome aboard! :)

-Andrzej

[1] https://github.com/llvm/llvm-project/blob/main/flang/tools/f18/flang.in