[FLASH-USERS] Error reading mod file when compiling Sedov example problem

[Ryan Farber]

Hi David,

Can you explain why searching the flash-users archive page is not very
helpful for "newbies" ?
It's true you won't always know what to search, but in this case at least
(which crops up often) the following google search:

site:https://flash.rochester.edu/pipermail/flash-users/ iso_c_binding.mod

has the following webpage as its first result which mentions, similar to
you, to comment out those lines.
https://flash.rochester.edu/pipermail/flash-users/2024-May/008663.html

Thank you for passing it forward and helping out Sam by the way :)

Best wishes,
--------
Ryan


On Thu, Jun 12, 2025 at 10:28 AM David Montgomery <dsmont80 at gmail.com>
wrote:

> Hi Sam,
>
> I will answer since someone helped me with the same issue last week while
> trying to run FLASH on my Mac (Flash-newbie as well).
>
> In the Makefile.h file which should reside in your site directory that was
> made for your local machine, at the bottom of that file is a few lines
> about the “iso_c_binding.mod”.
>
> Comment out those lines (embedded in a logic statement) and try doing
> “make” again.
>
> And as was suggested to me, which doesn’t always help, you can go to the
> flash-users archive page, get the URL of that page and Google search the
> URL + whatever you’re specifically looking for. Sometimes that helps, but
> oftentimes not for us newbies.
>
> David
> Sent from my iPhone
>
> On Jun 12, 2025, at 10:59 AM, Sam Blackburn <samuelblackburn32 at gmail.com>
> wrote:
>
> 
> Hi FLASH users,
>
> I am using FLASH version 4.8 with MacOS Sonoma 14.7.6. I'm super new to
> this code, and really the mac terminal in general, so I'm going through the
> user's guide step by step. I'm at section 2.2, where I set up the Sedov
> problem with this command in the FLASH4.8 dir:
> ./setup Sedov -auto -site=sam
> Where site=sam because I'm not at any institution so I personalized a
> makefile for my system. When i run:
> cd object
> make
> It does the compilation for around 30 seconds, and then out of nowhere it
> throws this:
>
> f951: Fatal Error: Reading module 'iso_c_binding.mod' at line 1 column 1:
> Unexpected EOF
>
> compilation terminated.
>
> make: *** [Cpp_interface.o] Error 1
> I've tried reinstalling gcc with HomeBrew, which didn't fix anything. Then
> I made a test file that calls iso_c_binding.mod to check for its existence
> in the FLASH4.8 dir, which did end up working, so I knew it was somewhere.
> Then I searched for it in Finder, and I realized its a blank file that gets
> created every time I compile, inside /FLASH4.8/object. So apparently the
> error arises when it tries to interpret literally nothing. How do I fix
> this? Please ask if you need more info.
>
> Thank you!
> - Sam
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