[FLASH-USERS] New Install, f951: Fatal Error: Reading module ‘iso_c_binding.mod’

David Montgomery dsmont80 at gmail.com
Fri Jun 6 00:54:52 EDT 2025


All,

I’m a FLASH newbie, and just installed FLASH4.8 on a laptop running MacOS 12.7.6, following Leland Ellison’s post "Installing FLASH on macOS from scratch” posted 06/13/2023.

Everything seemed to install successfully, and I edited the Makefile.h as noted in his step 7.

My Makefile.h is attached

And I updated all the *.py setup scripts in FLASH4.8/bin to "/usr/bin/env python3” as noted in Step 8.

I then tried his step 9:

cd FLASH4.8
./setup -auto Sedov

Changing his typo from -audo to -auto

When I got the following error:

make
rm -f reorder.sh
/opt/homebrew/bin//mpif90 -ggdb -c -O2 -fdefault-real-8 -fdefault-double-8 -Wuninitialized -fallow-argument-mismatch  -DMAXBLOCKS=1000 -DNXB=8 -DNYB=8 -DNZB=1 -DN_DIM=2 Cpp_interface.F90
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 searched the Users posts, and found a previous post stating to include "-fallow-argument-mismatch” in FFLAGS_OPT, FFLAGS_DEBUG, and FFLAGS_TEST.

But per Leland’s Mac install instructions that has already been done.

See my attached Makefile.h

Any help please?

David Montgomery
LANL Guest Scientist
LANL (retired)

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