gitlab-ci: Add CI support for s390x under cross-compilationwip/cross-ci-s390x

This adds rudimentary validation of s390x (supported via the LLVM
backend) via cross-compilation on Debian 11. The goal is to provide at
least minimal test coverage of big-endian platforms.

2 files changed, 122 insertions, 0 deletions

diff --git a/.gitlab/gen_ci.hs b/.gitlab/gen_ci.hs
index db338b88d4..2ab1969233 100755
--- a/.gitlab/gen_ci.hs
+++ b/.gitlab/gen_ci.hs
@@ -814,6 +814,7 @@ jobs = Map.fromList $ concatMap flattenJobGroup $
      , allowFailureGroup (standardBuildsWithConfig Amd64 (Linux Alpine) static)
      , disableValidate (allowFailureGroup (standardBuildsWithConfig Amd64 (Linux Alpine) staticNativeInt))
      , validateBuilds Amd64 (Linux Debian11) (crossConfig "aarch64-linux-gnu" (Just "qemu-aarch64 -L /usr/aarch64-linux-gnu"))
+     , validateBuilds Amd64 (Linux Debian11) (crossConfig "s390x-linux-gnu" (Just "qemu-s390x -L /usr/s390x-linux-gnu"))
      ]
 
   where
diff --git a/.gitlab/jobs.yaml b/.gitlab/jobs.yaml
index 07e91da267..7bd3b01e1b 100644
--- a/.gitlab/jobs.yaml
+++ b/.gitlab/jobs.yaml
@@ -1328,6 +1328,67 @@
       "XZ_OPT": "-9"
     }
   },
+  "nightly-x86_64-linux-deb11-cross_s390x-linux-gnu-validate": {
+    "after_script": [
+      ".gitlab/ci.sh save_cache",
+      ".gitlab/ci.sh clean",
+      "cat ci_timings"
+    ],
+    "allow_failure": false,
+    "artifacts": {
+      "expire_in": "8 weeks",
+      "paths": [
+        "ghc-x86_64-linux-deb11-cross_s390x-linux-gnu-validate.tar.xz",
+        "junit.xml"
+      ],
+      "reports": {
+        "junit": "junit.xml"
+      },
+      "when": "always"
+    },
+    "cache": {
+      "key": "x86_64-linux-deb11-$CACHE_REV",
+      "paths": [
+        "cabal-cache",
+        "toolchain"
+      ]
+    },
+    "dependencies": [],
+    "image": "registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-deb11:$DOCKER_REV",
+    "needs": [
+      {
+        "artifacts": false,
+        "job": "hadrian-ghc-in-ghci"
+      }
+    ],
+    "rules": [
+      {
+        "if": "($CI_MERGE_REQUEST_LABELS !~ /.*fast-ci.*/) && ($RELEASE_JOB != \"yes\") && ($NIGHTLY) && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\")",
+        "when": "on_success"
+      }
+    ],
+    "script": [
+      "sudo chown ghc:ghc -R .",
+      ".gitlab/ci.sh setup",
+      ".gitlab/ci.sh configure",
+      ".gitlab/ci.sh build_hadrian",
+      ".gitlab/ci.sh test_hadrian"
+    ],
+    "stage": "full-build",
+    "tags": [
+      "x86_64-linux"
+    ],
+    "variables": {
+      "BIGNUM_BACKEND": "gmp",
+      "BIN_DIST_NAME": "ghc-x86_64-linux-deb11-cross_s390x-linux-gnu-validate",
+      "BUILD_FLAVOUR": "validate",
+      "CONFIGURE_ARGS": "--with-intree-gmp",
+      "CROSS_EMULATOR": "qemu-s390x -L /usr/s390x-linux-gnu",
+      "CROSS_TARGET": "s390x-linux-gnu",
+      "TEST_ENV": "x86_64-linux-deb11-cross_s390x-linux-gnu-validate",
+      "XZ_OPT": "-9"
+    }
+  },
   "nightly-x86_64-linux-deb11-validate": {
     "after_script": [
       ".gitlab/ci.sh save_cache",
@@ -3810,6 +3871,66 @@
       "TEST_ENV": "x86_64-linux-deb11-cross_aarch64-linux-gnu-validate"
     }
   },
+  "x86_64-linux-deb11-cross_s390x-linux-gnu-validate": {
+    "after_script": [
+      ".gitlab/ci.sh save_cache",
+      ".gitlab/ci.sh clean",
+      "cat ci_timings"
+    ],
+    "allow_failure": false,
+    "artifacts": {
+      "expire_in": "2 weeks",
+      "paths": [
+        "ghc-x86_64-linux-deb11-cross_s390x-linux-gnu-validate.tar.xz",
+        "junit.xml"
+      ],
+      "reports": {
+        "junit": "junit.xml"
+      },
+      "when": "always"
+    },
+    "cache": {
+      "key": "x86_64-linux-deb11-$CACHE_REV",
+      "paths": [
+        "cabal-cache",
+        "toolchain"
+      ]
+    },
+    "dependencies": [],
+    "image": "registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-deb11:$DOCKER_REV",
+    "needs": [
+      {
+        "artifacts": false,
+        "job": "hadrian-ghc-in-ghci"
+      }
+    ],
+    "rules": [
+      {
+        "if": "($CI_MERGE_REQUEST_LABELS !~ /.*fast-ci.*/) && ($RELEASE_JOB != \"yes\") && ($NIGHTLY == null) && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\") && (\"true\" == \"true\")",
+        "when": "on_success"
+      }
+    ],
+    "script": [
+      "sudo chown ghc:ghc -R .",
+      ".gitlab/ci.sh setup",
+      ".gitlab/ci.sh configure",
+      ".gitlab/ci.sh build_hadrian",
+      ".gitlab/ci.sh test_hadrian"
+    ],
+    "stage": "full-build",
+    "tags": [
+      "x86_64-linux"
+    ],
+    "variables": {
+      "BIGNUM_BACKEND": "gmp",
+      "BIN_DIST_NAME": "ghc-x86_64-linux-deb11-cross_s390x-linux-gnu-validate",
+      "BUILD_FLAVOUR": "validate",
+      "CONFIGURE_ARGS": "--with-intree-gmp",
+      "CROSS_EMULATOR": "qemu-s390x -L /usr/s390x-linux-gnu",
+      "CROSS_TARGET": "s390x-linux-gnu",
+      "TEST_ENV": "x86_64-linux-deb11-cross_s390x-linux-gnu-validate"
+    }
+  },
   "x86_64-linux-deb11-validate": {
     "after_script": [
       ".gitlab/ci.sh save_cache",