Try clang 14 on ubuntu

Author: jonkeane

ci/docker/linux-r.dockerfile

@@ -36,6 +36,9 @@ ENV R_CUSTOM_CCACHE=${r_custom_ccache}
 ARG r_update_clang=false
 ENV R_UPDATE_CLANG=${r_update_clang}
 
+ARG r_old_clang=false
+ENV R_OLD_CLANG=${r_old_clang}
+
 ARG tz="UTC"
 ENV TZ=${tz}
 

ci/scripts/r_docker_configure.sh

@@ -97,5 +97,13 @@ if [ "$R_UPDATE_CLANG" = true ]; then
   apt install -y clang-20 lld-20
 fi
 
+# Use an old clang version to simulate CRAN's macos clang-14 environment.
+# This is only for rhub/clang20. If we change the base image from rhub/clang20,
+# we need to update this part too.
+if [ "$R_OLD_CLANG" = true ]; then
+  apt update -y --allow-releaseinfo-change # flag needed for when debian version changes
+  apt install -y clang-14 lld-14
+fi
+
 # Workaround for html help install failure; see https://github.com/r-lib/devtools/issues/2084#issuecomment-530912786
 Rscript -e 'x <- file.path(R.home("doc"), "html"); if (!file.exists(x)) {dir.create(x, recursive=TRUE); file.copy(system.file("html/R.css", package="stats"), x)}'

compose.yaml

@@ -1667,6 +1667,7 @@ services:
         r_prune_deps: ${R_PRUNE_DEPS}
         r_custom_ccache: ${R_CUSTOM_CCACHE}
         r_update_clang: ${R_UPDATE_CLANG}
+        r_old_clang: ${R_OLD_CLANG}
     shm_size: *shm-size
     environment:
       <<: [*common, *sccache]

dev/tasks/r/github.linux.cran.yml

@@ -34,12 +34,14 @@ jobs:
           - { r_image: "ubuntu-next" }  # ~ r-patched-linux-x86_64
           - { r_image: "ubuntu-release" }  # ~ r-release-linux-x86_64
           - { r_image: "clang20", skip_vignettes: true, r_update_clang: true }  # ~ r-devel-linux-x86_64-fedora-clang
+          - { r_image: "clang20", skip_vignettes: true, r_old_clang: true }  # ~ r-devel-linux-x86_64-fedora-clang
     env:
       R_ORG: "rhub"
       R_IMAGE: {{ '${{ matrix.config.r_image }}' }}
       R_TAG: "latest"
       ARROW_R_DEV: "FALSE"
       R_UPDATE_CLANG: {{ '${{ matrix.config.r_update_clang }}' }}
+      R_OLD_CLANG: {{ '${{ matrix.config.r_old_clang }}' }}
     steps:
       {{ macros.github_checkout_arrow()|indent }}
       {{ macros.github_install_archery()|indent }}

dev/tasks/r/github.macos.cran.yml

@@ -22,7 +22,7 @@
 jobs:
   macos-cran:
     name: "macOS similar to CRAN"
-    runs-on: macOS-14
+    runs-on: macOS-latest
     strategy:
       fail-fast: false
 
@@ -31,7 +31,7 @@ jobs:
 
       - name: Configure dependencies (macos)
         run: |
-          brew install openssl llvm@14
+          brew install openssl
           # disable sccache on macos as it times out for unknown reasons
           # see GH-33721
           # brew install sccache
@@ -61,7 +61,7 @@ jobs:
       - name: Install
         env:
           _R_CHECK_CRAN_INCOMING_: false
-          CXX: "clang++-14 -mmacos-version-min=14.6"
+          CXX: "clang++ -mmacos-version-min=14.6"
           CFLAGS: "-falign-functions=8 -g -O2 -Wall -pedantic -Wconversion -Wno-sign-conversion -Wstrict-prototypes"
           CXXFLAGS: "-g -O2 -Wall -pedantic -Wconversion -Wno-sign-conversion"
           NOT_CRAN: false