Re: [fltk.coredev] What does the "fluid-cmd" exe do on the WIN32 builds?

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Re: What does the "fluid-cmd" exe do on the WIN32 builds? Greg Ercolano Oct 01, 2022 top right image

On 10/1/22 05:32, Albrecht Schlosser wrote:

On 10/1/22 14:00 Ian MacArthur wrote:

So, what *does* fluid-cmd.exe do?
It gets built by the cmake builds on Windows (the Makefile build doesn’t seem to build it?) but I cannot tell what it does - I can’t read cmake files very well, but it seems to be built out of the same things as “regular” fluid... and..?

The only difference is that it's a Windows Console (-mconsole) rather than a Windows GUI (-mwindows) executable. This was done on request (by Greg) because some fluid issues (e.g. not being able to access remote file systems or other errors) would not display an error message if built as GUI exe as it was before.

    Yes, though more importantly: the Makefile would not get a proper exit code from fluid
    when it failed, causing a build invoking e.g. 'fluid -c foo.fl' to sail right through
    even if the creation of .cxx/.h failed due to a write error.

    This is super bad in a production environment, where build errors MUST stop the build,
    otherwise build errors would go undetected.

    In my case I was building a 3rd party app in a context where the .cxx/.h files had
    weird network permissions (ACLs vs unix chmod), preventing them from being overwritten
    by fluid, causing stale .cxx/.h files to remain behind after fluid finished, and since the Makefile
    never saw an exit code, caused the old code in the new binary, causing old behavior in new
    releases. This was BAD BAD BAD.

Anyway, I noticed this because a 32-bit mingw checkout choked at build for me - stuck in fluid-cmd.exe, just sitting there... indefinitely...

    Hmm, I'd be curious what fluid-cmd's were being invoked (was it the -c flag? e.g. "fluid-cmd -c xyz.fl"?)

    For sure that should just write out files, print errors to stdout/err and /exit/, and not pop any GUI dialogs
    so as to prevent any kind of interaction with the GUI, esp. in a parallel processing context where several
    might run at once, such as from a parallel make.

    fluid should be avoiding ANY gui calls during a -c operation; all -c flag handling in main()
    should precede any initialization or use of FLTK calls.

    Hopefully there's no global window manager stuff being triggered before main() in fluid,
    otherwise there might be contention with the window manager in a parallel build
    scenario, where two or more fluids run at once, contending for the window manager
    and blocking each other. I hope that's not the case.

What is it, what’s it for, how/why is it different from “regular” fluid, etc.?
And why does it hang?

See above. It should not make a difference and it did not for me. Other Windows/MSYS2 magic seems to cause these hangs but I have no idea how to debug this (other than printf statements in fluid, maybe).

    I'd probably suggest attaching a debugger to one of the hung processes
    to see what it's stuck executing.

    If it's hung during a -c command in window manager stuff, then we may have
    to move the -c option to a separate binary that doesn't link with fltk, just so
    it can be a purely 'headless' command line tool.


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