gnu: Set up the CI for _FILE_OFFSET_BITS=64

Add new jobs for i686 in test_tier1 and arm and powerpc in test_tier2
where RUST_LIBC_UNSTABLE_GNU_FILE_OFFSET_BITS=64.

Use artifact-tag to avoid artifact name collisions.

(backport <rust-lang#4345>)
(cherry picked from commit 874e399)

Author: snogge

.github/workflows/ci.yaml

@@ -77,6 +77,12 @@ jobs:
           - target: i686-unknown-linux-gnu
             docker: true
             os: ubuntu-24.04
+          - target: i686-unknown-linux-gnu
+            docker: true
+            os: ubuntu-24.04
+            artifact-tag: offset-bits64
+            env:
+              RUST_LIBC_UNSTABLE_GNU_FILE_OFFSET_BITS: 64
           - target: x86_64-unknown-linux-gnu
             docker: true
             os: ubuntu-24.04
@@ -129,7 +135,7 @@ jobs:
       - uses: actions/upload-artifact@v4
         if: always() && steps.create_artifacts.outcome == 'success'
         with:
-          name: ${{ env.ARCHIVE_NAME }}-${{ matrix.target }}
+          name: ${{ env.ARCHIVE_NAME }}-${{ matrix.target }}${{ matrix.artifact-tag && format('-{0}', matrix.artifact-tag) }}
           path: ${{ env.ARCHIVE_PATH }}
           retention-days: 5
 
@@ -149,15 +155,11 @@ jobs:
           - aarch64-unknown-linux-gnu
           - aarch64-unknown-linux-musl
           - arm-linux-androideabi
-          - arm-unknown-linux-gnueabihf
           - arm-unknown-linux-musleabihf
           - i686-linux-android
           - i686-unknown-linux-musl
           - loongarch64-unknown-linux-gnu
           - loongarch64-unknown-linux-musl
-          # FIXME(ppc): SIGILL running tests, see
-          # https://github.com/rust-lang/libc/pull/4254#issuecomment-2636288713
-          # - powerpc-unknown-linux-gnu
           - powerpc64-unknown-linux-gnu
           - powerpc64le-unknown-linux-gnu
           - riscv64gc-unknown-linux-gnu
@@ -172,6 +174,19 @@ jobs:
           # FIXME: It seems some items in `src/unix/mod.rs`
           # aren't defined on redox actually.
           # - x86_64-unknown-redox
+        include:
+          - target: arm-unknown-linux-gnueabihf
+          - target: arm-unknown-linux-gnueabihf
+            env:
+              RUST_LIBC_UNSTABLE_GNU_FILE_OFFSET_BITS: 64
+            artifact-tag: offset-bits64
+          # FIXME(ppc): SIGILL running tests, see
+          # https://github.com/rust-lang/libc/pull/4254#issuecomment-2636288713
+          # - target: powerpc-unknown-linux-gnu
+          # - target: powerpc-unknown-linux-gnu
+          #   env:
+          #     RUST_LIBC_UNSTABLE_GNU_FILE_OFFSET_BITS: 64
+          #   artifact-tag: offset-bits64
     timeout-minutes: 25
     env:
       TARGET: ${{ matrix.target }}
@@ -200,7 +215,7 @@ jobs:
       - uses: actions/upload-artifact@v4
         if: always() && steps.create_artifacts.outcome == 'success'
         with:
-          name: ${{ env.ARCHIVE_NAME }}-${{ matrix.target }}
+          name: ${{ env.ARCHIVE_NAME }}-${{ matrix.target }}${{ matrix.artifact-tag && format('-{0}', matrix.artifact-tag) }}
           path: ${{ env.ARCHIVE_PATH }}
           retention-days: 5
 

ci/run-docker.sh

@@ -43,6 +43,7 @@ run() {
         --user "$(id -u)":"$(id -g)" \
         --env LIBC_CI \
         --env LIBC_CI_ZBUILD_STD \
+        --env RUST_LIBC_UNSTABLE_GNU_FILE_OFFSET_BITS \
         --env CARGO_HOME=/cargo \
         --env CARGO_TARGET_DIR=/checkout/target \
         --volume "$CARGO_HOME":/cargo \

ci/verify-build.sh

@@ -75,6 +75,11 @@ test_target() {
     if [ "$os" = "linux" ]; then
         # Test with the equivalent of __USE_TIME_BITS64
         RUST_LIBC_UNSTABLE_LINUX_TIME_BITS64=1 $cmd
+        case "$target" in
+            # Test with the equivalent of __FILE_OFFSET_BITS=64
+            arm*-gnu*|i*86*-gnu|powerpc-*-gnu*|mips*-gnu|sparc-*-gnu|thumb-*gnu*)
+                RUST_LIBC_UNSTABLE_GNU_FILE_OFFSET_BITS=64 $cmd;;
+        esac
     fi
 
     # Test again without default features, i.e. without "std"
@@ -92,7 +97,7 @@ test_target() {
         stable-x86_64-*freebsd*) do_freebsd_checks=1 ;;
         nightly-i686*freebsd*) do_freebsd_checks=1 ;;
     esac
-    
+
     if [ -n "${do_freebsd_checks:-}" ]; then
         for version in $freebsd_versions; do
             export RUST_LIBC_UNSTABLE_FREEBSD_VERSION="$version"
@@ -300,7 +305,7 @@ filter_and_run() {
         if [ "$target" = "wasm32-wasip2" ] && [ "$supports_wasi_pn" = "0" ]; then
             return
         fi
-            
+
         test_target "$target" "$no_dist"
         some_tests_run=1
     fi