Fortran: Difference between revisions

Revision as of 20:17, 31 May 2025

The Fortran front-end for gcc can be enabled by adding pkgs.gfortran to environment.systemPackages.

If both gcc and gfortran are included, the build may fail with an error of the form: "collision between gfortran-wrapper/bin/gcc and gcc-wrapper/bin/gcc".

An example nix flake:

{
  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

  outputs = {nixpkgs, ...}: let
    system = "x86_64-linux";
    pkgs = nixpkgs.legacyPackages.${system};
  in {
    devShells.${system}.default = pkgs.mkShell {
      packages = with pkgs; [
        gfortran
      ];
    };
  };
}

Run nix develop to enter the nix shell, then compile with gfortran myfile.f.

@@ Line 1: / Line 1: @@
-The Fortran front-end for gcc can be enabled by adding '''pkgs.gfortran.cc''' to '''environment.systemPackages'''. <ref>https://github.com/NixOS/nixpkgs/issues/61736</ref>
+The Fortran front-end for gcc can be enabled by adding <code>pkgs.gfortran</code> to {{Nixos:option|environment.systemPackages}}.
-The addition of '''.cc''' indicates the compiler itself without the gcc-wrapper Nix expressions used by '''gfortran'''. <ref>https://github.com/NixOS/nixpkgs/issues/20270</ref>
+If both <code>gcc</code> and <code>gfortran</code> are included, the build may fail with an error of the form: "collision between gfortran-wrapper/bin/gcc and gcc-wrapper/bin/gcc".
-If both '''gcc''' and '''gfortran''' (without '''.cc''') are included, the build may fail with an error of the form: "collision between gfortran-wrapper/bin/gcc and gcc-wrapper/bin/gcc".
+An example [[Flakes|nix flake]]:
+<syntaxhighlight lang="nix">
+{
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  outputs = {nixpkgs, ...}: let
+    system = "x86_64-linux";
+    pkgs = nixpkgs.legacyPackages.${system};
+  in {
+    devShells.${system}.default = pkgs.mkShell {
+      packages = with pkgs; [
+        gfortran
+      ];
+    };
+  };
+}
+</syntaxhighlight>
+Run <code>nix develop</code> to enter the nix shell, then compile with <code>gfortran myfile.f</code>.