Compile ovni with older GCC versions

.gitlab-ci.yml

@@ -15,9 +15,16 @@ build:debian-testing:
     paths:
       - install/
 
+build:old-gcc:
+  stage: build
+  tags:
+    - nix
+  script: 
+    - nix build -L --tarball-ttl 0 --file nix/rt.nix bsc.oldOvnis
+
 build:rt-tests:
   stage: build
   tags:
     - nix
   script: 
-    - nix build -L --tarball-ttl 0 --file nix/rt.nix
+    - nix build -L --tarball-ttl 0 --file nix/rt.nix bsc.ovni-rt

nix/rt.nix

@@ -87,6 +87,26 @@ let
       ];
     });
 
+    # Build ovni with old gcc versions
+    genOldOvni = stdenv: (last.ovni.override {
+      stdenv = stdenv;
+    }).overrideAttrs (old: {
+      pname = old.name + "@" + stdenv.cc.cc.version;
+    });
+
+    oldCompilers = [
+      #pkgs.gcc49Stdenv
+      pkgs.gcc6Stdenv
+      pkgs.gcc7Stdenv
+      pkgs.gcc8Stdenv
+      pkgs.gcc9Stdenv
+      pkgs.gcc10Stdenv
+      pkgs.gcc11Stdenv
+      pkgs.gcc12Stdenv
+    ];
+
+    oldOvnis = map last.genOldOvni last.oldCompilers;
+
     # Now we rebuild ovni with the Nanos6 and nOS-V versions, which were
     # linked to the previous ovni. We need to be able to exit the chroot
     # to run Nanos6 tests, as they require access to /sys for hwloc
@@ -108,4 +128,4 @@ let
   });
 
 in
-  bsc.ovni-rt
+  pkgs // { bsc = bsc; }