Require C++17

Policy information:
https://opensource.google/documentation/policies/cplusplus-support#c_language_standard
https://github.com/google/oss-policies-info/blob/main/foundational-cxx-support-matrix.md

PiperOrigin-RevId: 723589409
Change-Id: Ia8665c052ed40f2a78308f7eb0c330191b0cf981

ci/linux_arm_clang-latest_libcxx_bazel.sh

@@ -25,7 +25,7 @@ if [[ -z ${ABSEIL_ROOT:-} ]]; then
 fi
 
 if [[ -z ${STD:-} ]]; then
-  STD="c++14 c++17 c++20"
+  STD="c++17 c++20"
 fi
 
 if [[ -z ${COMPILATION_MODE:-} ]]; then

ci/linux_clang-latest_libcxx_asan_bazel.sh

@@ -25,7 +25,7 @@ if [[ -z ${ABSEIL_ROOT:-} ]]; then
 fi
 
 if [[ -z ${STD:-} ]]; then
-  STD="c++14 c++17 c++20"
+  STD="c++17 c++20"
 fi
 
 if [[ -z ${COMPILATION_MODE:-} ]]; then

ci/linux_clang-latest_libcxx_bazel.sh

@@ -25,7 +25,7 @@ if [[ -z ${ABSEIL_ROOT:-} ]]; then
 fi
 
 if [[ -z ${STD:-} ]]; then
-  STD="c++14 c++17 c++20"
+  STD="c++17 c++20"
 fi
 
 if [[ -z ${COMPILATION_MODE:-} ]]; then

ci/linux_clang-latest_libcxx_tsan_bazel.sh

@@ -25,7 +25,7 @@ if [[ -z ${ABSEIL_ROOT:-} ]]; then
 fi
 
 if [[ -z ${STD:-} ]]; then
-  STD="c++14 c++17 c++20"
+  STD="c++17 c++20"
 fi
 
 if [[ -z ${COMPILATION_MODE:-} ]]; then

ci/linux_clang-latest_libstdcxx_bazel.sh

@@ -25,7 +25,7 @@ if [[ -z ${ABSEIL_ROOT:-} ]]; then
 fi
 
 if [[ -z ${STD:-} ]]; then
-  STD="c++14 c++17"
+  STD="c++17"
 fi
 
 if [[ -z ${COMPILATION_MODE:-} ]]; then

ci/linux_gcc-floor_libstdcxx_bazel.sh

@@ -24,8 +24,11 @@ if [[ -z ${ABSEIL_ROOT:-} ]]; then
   ABSEIL_ROOT="$(realpath $(dirname ${0})/..)"
 fi
 
+# TODO(absl-team): Update to linux_gcc-floor GCC8. C++17 support was incomplete
+# in GCC7, so for now this script will trivally pass.
+exit 0
 if [[ -z ${STD:-} ]]; then
-  STD="c++14"
+  STD="c++17"
 fi
 
 if [[ -z ${COMPILATION_MODE:-} ]]; then

ci/linux_gcc-latest_libstdcxx_bazel.sh

@@ -25,7 +25,7 @@ if [[ -z ${ABSEIL_ROOT:-} ]]; then
 fi
 
 if [[ -z ${STD:-} ]]; then
-  STD="c++14 c++17 c++20"
+  STD="c++17 c++20"
 fi
 
 if [[ -z ${COMPILATION_MODE:-} ]]; then

ci/linux_gcc-latest_libstdcxx_cmake.sh

@@ -23,7 +23,7 @@ fi
 source "${ABSEIL_ROOT}/ci/cmake_common.sh"
 
 if [[ -z ${ABSL_CMAKE_CXX_STANDARDS:-} ]]; then
-  ABSL_CMAKE_CXX_STANDARDS="14 17 20"
+  ABSL_CMAKE_CXX_STANDARDS="17 20"
 fi
 
 if [[ -z ${ABSL_CMAKE_BUILD_TYPES:-} ]]; then

ci/linux_gcc_alpine_cmake.sh

@@ -23,7 +23,7 @@ fi
 source "${ABSEIL_ROOT}/ci/cmake_common.sh"
 
 if [[ -z ${ABSL_CMAKE_CXX_STANDARDS:-} ]]; then
-  ABSL_CMAKE_CXX_STANDARDS="14 17"
+  ABSL_CMAKE_CXX_STANDARDS="17"
 fi
 
 if [[ -z ${ABSL_CMAKE_BUILD_TYPES:-} ]]; then

ci/macos_xcode_bazel.sh

@@ -19,6 +19,9 @@
 
 set -euox pipefail
 
+# Use Xcode 16.0
+sudo xcode-select -s /Applications/Xcode_16.0.app/Contents/Developer
+
 if [[ -z ${ABSEIL_ROOT:-} ]]; then
   ABSEIL_ROOT="$(realpath $(dirname ${0})/..)"
 fi
@@ -58,7 +61,7 @@ brew uninstall google-benchmark
 ${BAZEL_BIN} test ... \
   --copt="-DGTEST_REMOVE_LEGACY_TEST_CASEAPI_=1" \
   --copt="-Werror" \
-  --cxxopt="-std=c++14" \
+  --cxxopt="-std=c++17" \
   --enable_bzlmod=true \
   --features=external_include_paths \
   --keep_going \

ci/macos_xcode_cmake.sh

@@ -16,6 +16,12 @@
 
 set -euox pipefail
 
+# Use Xcode 16.0
+sudo xcode-select -s /Applications/Xcode_16.0.app/Contents/Developer
+
+export CMAKE_BUILD_PARALLEL_LEVEL=$(sysctl -n hw.ncpu)
+export CTEST_PARALLEL_LEVEL=$(sysctl -n hw.ncpu)
+
 if [[ -z ${ABSEIL_ROOT:-} ]]; then
   ABSEIL_ROOT="$(dirname ${0})/.."
 fi
@@ -53,7 +59,7 @@ for compilation_mode in ${ABSL_CMAKE_BUILD_TYPES}; do
         -DBUILD_SHARED_LIBS=${build_shared} \
         -DABSL_BUILD_TESTING=ON \
         -DCMAKE_BUILD_TYPE=${compilation_mode} \
-        -DCMAKE_CXX_STANDARD=14 \
+        -DCMAKE_CXX_STANDARD=17 \
         -DCMAKE_MODULE_LINKER_FLAGS="-Wl,--no-undefined" \
         -DABSL_BUILD_MONOLITHIC_SHARED_LIBS=${monolithic_shared} \
         -DABSL_GOOGLETEST_DOWNLOAD_URL="${ABSL_GOOGLETEST_DOWNLOAD_URL}"

ci/windows_clangcl_bazel.bat

@@ -21,10 +21,10 @@ SET BAZEL_LLVM=C:\Program Files\LLVM
 CD %~dp0\..
 if %errorlevel% neq 0 EXIT /B 1
 
-:: Set the standard version, [c++14|c++17|c++20|c++latest]
+:: Set the standard version, [c++17|c++20|c++latest]
 :: https://msdn.microsoft.com/en-us/library/mt490614.aspx
-:: The default is c++14 if not set on command line.
-IF "%STD%"=="" SET STD=c++14
+:: The default is c++17 if not set on command line.
+IF "%STD%"=="" SET STD=c++17
 
 :: Set the compilation_mode (fastbuild|opt|dbg)
 :: https://docs.bazel.build/versions/master/user-manual.html#flag--compilation_mode

ci/windows_msvc_bazel.bat

@@ -18,10 +18,10 @@ SETLOCAL ENABLEDELAYEDEXPANSION
 CD %~dp0\..
 if %errorlevel% neq 0 EXIT /B 1
 
-:: Set the standard version, [c++14|c++latest]
+:: Set the standard version, [c++17|c++latest]
 :: https://msdn.microsoft.com/en-us/library/mt490614.aspx
-:: The default is c++14 if not set on command line.
-IF "%STD%"=="" SET STD=c++14
+:: The default is c++17 if not set on command line.
+IF "%STD%"=="" SET STD=c++17
 
 :: Set the compilation_mode (fastbuild|opt|dbg)
 :: https://docs.bazel.build/versions/master/user-manual.html#flag--compilation_mode