Add no LTO tests for old gcc versions too

.gitlab-ci.yml

@@ -19,12 +19,19 @@ build:old-gcc:
   stage: build
   tags:
     - nix
-  script: 
+  script:
     - nix build -L --tarball-ttl 0 --file nix/rt.nix bsc.oldOvnis
 
+build:old-gcc-no-lto:
+  stage: build
+  tags:
+    - nix
+  script:
+    - nix build -L --tarball-ttl 0 --file nix/rt.nix bsc.oldOvnisNoLTO
+
 build:rt-tests:
   stage: build
   tags:
     - nix
-  script: 
+  script:
     - nix build -L --tarball-ttl 0 --file nix/rt.nix bsc.ovni-rt

nix/rt.nix

@@ -110,6 +110,14 @@ let
 
     oldOvnis = map last.genOldOvni last.oldCompilers;
 
+    genOldOvniNoLTO = stdenv: (last.genOldOvni stdenv).overrideAttrs (old: {
+      cmakeFlags = old.cmakeFlags ++ [
+        "-DCMAKE_INTERPROCEDURAL_OPTIMIZATION=OFF"
+      ];
+    });
+
+    oldOvnisNoLTO = map last.genOldOvniNoLTO 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