GH-45885: [C++] Require C++20

Author: pitrou

.env

@@ -57,7 +57,7 @@ FEDORA=42
 UBUNTU=22.04
 
 # Default versions for various dependencies
-CLANG_TOOLS=14
+CLANG_TOOLS=18
 CMAKE=3.26.0
 CUDA=11.7.1
 DASK=latest

.github/workflows/cpp.yml

@@ -81,24 +81,24 @@ jobs:
       matrix:
         include:
           - arch: amd64
-            clang-tools: 14
+            clang-tools: 18
             image: conda-cpp
-            llvm: 14
+            llvm: 18
             runs-on: ubuntu-latest
             simd-level: AVX2
             title: AMD64 Conda C++ AVX2
             ubuntu: 22.04
           - arch: amd64
-            clang-tools: 14
+            clang-tools: 18
             image: ubuntu-cpp-sanitizer
-            llvm: 14
+            llvm: 18
             runs-on: ubuntu-latest
             title: AMD64 Ubuntu 24.04 C++ ASAN UBSAN
             ubuntu: 24.04
           - arch: arm64v8
-            clang-tools: 14
+            clang-tools: 18
             image: ubuntu-cpp
-            llvm: 14
+            llvm: 18
             runs-on: ubuntu-24.04-arm
             title: ARM64 Ubuntu 22.04 C++
             ubuntu: 22.04

.github/workflows/cpp_windows.yml

@@ -63,7 +63,7 @@ jobs:
       ARROW_WITH_ZLIB: ON
       ARROW_WITH_ZSTD: ON
       BOOST_SOURCE: BUNDLED
-      CMAKE_CXX_STANDARD: "17"
+      CMAKE_CXX_STANDARD: "20"
       CMAKE_GENERATOR: Ninja
       CMAKE_INSTALL_PREFIX: /usr
       CMAKE_UNITY_BUILD: ON

.github/workflows/r.yml

@@ -229,12 +229,13 @@ jobs:
           # static library. The R is not used here but R 4.1 was the last R to use
           # Rtools40.
           r-version: "4.1"
-          rtools-version: 40
+          rtools-version: ${{ matrix.config.rtools }}
           Ncpus: 2
       - name: Build Arrow C++
         shell: bash
         env:
           MINGW_ARCH: ${{ matrix.config.arch }}
+          RTOOLS_VERSION: ${{ matrix.config.rtools }}
         run: ci/scripts/r_windows_build.sh
       - name: Rename libarrow.zip
         # So that they're unique when multiple are downloaded in the next step

.github/workflows/ruby.yml

@@ -349,7 +349,7 @@ jobs:
       ARROW_WITH_SNAPPY: ON
       ARROW_WITH_ZLIB: ON
       ARROW_WITH_ZSTD: ON
-      CMAKE_CXX_STANDARD: "17"
+      CMAKE_CXX_STANDARD: "20"
       CMAKE_GENERATOR: Ninja
       CMAKE_INSTALL_PREFIX: "${{ github.workspace }}/dist"
       VCPKG_BINARY_SOURCES: 'clear;nuget,GitHub,readwrite'

c_glib/meson.build

@@ -21,7 +21,7 @@ project(
     'arrow-glib',
     'c',
     'cpp',
-    default_options: ['c_std=c99', 'cpp_std=c++17'],
+    default_options: ['c_std=c99', 'cpp_std=c++20'],
     license: 'Apache-2.0',
     # Debian:
     #   https://packages.debian.org/search?keywords=meson

ci/docker/centos-7-cpp.dockerfile

@@ -25,7 +25,7 @@ RUN sed -i \
       -e 's/mirror\.centos\.org/vault.centos.org/' \
       /etc/yum.repos.d/*.repo
 
-# devtoolset is required for C++17
+# devtoolset is required for C++20
 RUN \
   yum install -y \
     centos-release-scl \
@@ -38,7 +38,8 @@ RUN \
     /etc/yum.repos.d/CentOS-SCLo-scl*.repo && \
   yum install -y \
     curl \
-    devtoolset-8 \
+    devtoolset-11-gcc-c++ \
+    devtoolset-11-make \
     diffutils \
     gcc-c++ \
     libcurl-devel \

ci/scripts/cpp_build.sh

@@ -168,7 +168,7 @@ elif [ "${ARROW_EMSCRIPTEN:-OFF}" = "ON" ]; then
     -DCMAKE_VERBOSE_MAKEFILE=${CMAKE_VERBOSE_MAKEFILE:-OFF} \
     -DCMAKE_C_FLAGS="${CFLAGS:-}" \
     -DCMAKE_CXX_FLAGS="${CXXFLAGS:-}" \
-    -DCMAKE_CXX_STANDARD="${CMAKE_CXX_STANDARD:-17}" \
+    -DCMAKE_CXX_STANDARD="${CMAKE_CXX_STANDARD:-20}" \
     -DCMAKE_INSTALL_LIBDIR=${CMAKE_INSTALL_LIBDIR:-lib} \
     -DCMAKE_INSTALL_PREFIX=${CMAKE_INSTALL_PREFIX:-${ARROW_HOME}} \
     -DCMAKE_UNITY_BUILD=${CMAKE_UNITY_BUILD:-OFF} \
@@ -260,7 +260,7 @@ else
     -DCMAKE_VERBOSE_MAKEFILE=${CMAKE_VERBOSE_MAKEFILE:-OFF} \
     -DCMAKE_C_FLAGS="${CFLAGS:-}" \
     -DCMAKE_CXX_FLAGS="${CXXFLAGS:-}" \
-    -DCMAKE_CXX_STANDARD="${CMAKE_CXX_STANDARD:-17}" \
+    -DCMAKE_CXX_STANDARD="${CMAKE_CXX_STANDARD:-20}" \
     -DCMAKE_INSTALL_LIBDIR=${CMAKE_INSTALL_LIBDIR:-lib} \
     -DCMAKE_INSTALL_PREFIX=${CMAKE_INSTALL_PREFIX:-${ARROW_HOME}} \
     -DCMAKE_UNITY_BUILD=${CMAKE_UNITY_BUILD:-OFF} \

ci/scripts/install_sccache.sh

@@ -19,15 +19,17 @@
 
 set -e
 
+DEFAULT_VERSION=0.12.0
+
 if [  "$#" -lt 2 ] || [ "$#" -gt 3 ]; then
     echo "Usage: $0 <build> <prefix> <version>"
-    echo "Will default to version=0.3.0 "
+    echo "Will default to version=${DEFAULT_VERSION}"
     exit 1
 fi
 
 BUILD=$1
 PREFIX=$2
-VERSION=${3:-0.3.0}
+VERSION=${3:-${DEFAULT_VERSION}}
 ARCH=$(uname -m)
 
 if [ "${ARCH}" != x86_64 ] && [ "${ARCH}" != aarch64 ]; then

ci/scripts/r_windows_build.sh

@@ -44,7 +44,7 @@ mv mingw* build
 cd build
 
 # This may vary by system/CI provider
-MSYS_LIB_DIR="/c/rtools40"
+MSYS_LIB_DIR="/c/rtools${RTOOLS_VERSION}"
 
 # Untar the builds we made
 ls *.xz | xargs -n 1 tar -xJf