Dear Fortran community, I recently bought a Macbook pro with M4 Pro chips and trying to compile my project with fpm and gfortran. I used to compile on Linux system. My rsp file for fpm is: options run options --compiler gfortran options --flag “-O3 -march=native -mtune=native -pipe -fopenmp -flto…

Just asked chatgpt about the DWARF warning, and seems to get solved. It is because I had the debug flag -g on. If I delete that, then the compile passes and run the code.

Yes, I am using homebrew to install (almost) everything on my macos. May I ask what the flang for Fortran compilers is? How’s that compared to gfortran?

Here is a recent discussion thread about the flang compiler. First official release of Flang! - #11 by wyphan I have only recently begun to use it, so I don’t know much about its capabilities. I have noticed that it does not support 80-bit or 128-bit floating point arithmetic, but it does support on…

It may depend on the target, but I’m seeing that it supports 80-bit (kind = 10) and both 16-bit (kind = 2 & 3) formats. [image] Compiler Explorer - Fortran integer, parameter :: & real16 = selected_real_kind(3, 4), & ! IEEE half bfloat16 = selected_real_kind(2, 37), & ! trunca…

[image] RonShepard: FYI, many people with Macs and arm64 hardware use the homebrew package manager to install the gfortran and, more recently, flang fortran compilers. I’ve understood (maybe wongly) that conda is somehow the must-have package manager as of today for everything related to deve…

[image] PierU: (Homebrew attributing the ownership of /usr/local to a regular user is enough to keep me away…) I don’t know why, but on intel hardware they do that. On arm64 hardware, it installs in /opt.

[image] RonShepard: I don’t know why, but on intel hardware they do that. On arm64 hardware, it installs in /opt. That’s better… But the real pain is the ownership given to the regular user: is it the same when it installs in /opt ?

I would not know. The Homebrew instructions say that you can install under a user account, but I’ve never done that. I always install software from an admin account, and then run it under a user account. That is the same way I have always installed Apple Xcode software. BTW, speaking of Xcode, you o…

When Apple switched from Intel to its own silicon, Homebrew moved from that location to the /opt directory —it seems, because of a conflict with the Rosetta compatibility layer. Because of that, I gave MacPorts a try, but it was sort of a nightmare compared to Homebrew… YMMV.

[image] jwmwalrus: When Apple switched from Intel to its own silicon, […] It might have been just a coincidence, but that was about the same time that Apple locked down its / directory for security reasons. For example, the fink package manager switched then from using /sw to /opt/sw. I think…

Compiling gfortran in Macbook (M4 Pro)

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RonShepard August 31, 2025, 2:09pm 3

FYI, many people with Macs and arm64 hardware use the homebrew package manager to install the gfortran and, more recently, flang fortran compilers.

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Compiling gfortran in Macbook (M4 Pro)

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