CI: Use isolated build for all wheel packages

ci/build_wheel.sh

@@ -66,31 +66,30 @@ rapids-logger "Building '${package_name}' wheel"
 
 sccache --stop-server 2>/dev/null || true
 
+build_env_dir="/tmp/${package_name}-wheel-build-env"
+# `build` preserves this environment after a failed build for debugging. CI
+# retries must start with an empty directory, as required by `--env-dir`.
+rm -rf "${build_env_dir}"
+
 RAPIDS_PIP_WHEEL_ARGS=(
-  -w dist
-  -v
-  --no-deps
-  --disable-pip-version-check
+  --wheel
+  --outdir dist
+  --verbose
+  # A fixed location keeps isolated-build include paths stable for sccache.
+  --env-dir "${build_env_dir}"
+  --dependency-constraints-txt "${PIP_CONSTRAINT}"
 )
 
 # Add py-api setting for stable ABI builds
 if [[ "${stable_abi}" == "true" ]] && [[ -n "${RAPIDS_PY_API:-}" ]]; then
-  RAPIDS_PIP_WHEEL_ARGS+=(--config-settings="skbuild.wheel.py-api=${RAPIDS_PY_API}")
-fi
-
-# Only use --build-constraint when build isolation is enabled.
-#
-# Passing '--build-constraint' and '--no-build-isolation` together results in an error from 'pip',
-# but we want to keep environment variable PIP_CONSTRAINT set unconditionally.
-# PIP_NO_BUILD_ISOLATION=0 means "add --no-build-isolation" (ref: https://github.com/pypa/pip/issues/5735)
-if [[ "${PIP_NO_BUILD_ISOLATION:-}" != "0" ]]; then
-    RAPIDS_PIP_WHEEL_ARGS+=(--build-constraint="${PIP_CONSTRAINT}")
+  RAPIDS_PIP_WHEEL_ARGS+=(--config-setting="skbuild.wheel.py-api=${RAPIDS_PY_API}")
 fi
 
-# unset PIP_CONSTRAINT (set by rapids-init-pip)... it doesn't affect builds as of pip 25.3, and
-# results in an error from 'pip wheel' when set and --build-constraint is also passed
+# `build` receives the same generated constraints explicitly. Unset the
+# environment variable so it does not constrain the frontend installation.
 unset PIP_CONSTRAINT
-rapids-pip-retry wheel \
+
+rapids-python-build-retry \
     "${RAPIDS_PIP_WHEEL_ARGS[@]}" \
     .
 

ci/build_wheel_cuvs.sh

@@ -1,5 +1,5 @@
 #!/bin/bash
-# SPDX-FileCopyrightText: Copyright (c) 2023-2026, NVIDIA CORPORATION.
+# SPDX-FileCopyrightText: Copyright (c) 2023-2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 # SPDX-License-Identifier: Apache-2.0
 
 set -euo pipefail
@@ -14,7 +14,8 @@ RAPIDS_PY_CUDA_SUFFIX="$(rapids-wheel-ctk-name-gen "${RAPIDS_CUDA_VERSION}")"
 # then ensures 'cuvs' wheel builds always use the 'libcuvs' just built in the same CI run.
 #
 # env variable 'PIP_CONSTRAINT' is set up by rapids-init-pip. It constrains all subsequent
-# 'pip install', 'pip download', etc. calls (except those used in 'pip wheel', handled separately in build scripts)
+# 'pip install', 'pip download', etc. calls (except the isolated wheel build,
+# which is handled separately by ci/build_wheel.sh)
 LIBCUVS_WHEELHOUSE=$(rapids-download-from-github "$(rapids-artifact-name wheel_cpp libcuvs cuvs --cuda "$RAPIDS_CUDA_VERSION")")
 echo "libcuvs-${RAPIDS_PY_CUDA_SUFFIX} @ file://$(echo "${LIBCUVS_WHEELHOUSE}"/libcuvs_*.whl)" >> "${PIP_CONSTRAINT}"
 

ci/build_wheel_libcuvs.sh

@@ -1,5 +1,5 @@
 #!/bin/bash
-# SPDX-FileCopyrightText: Copyright (c) 2025-2026, NVIDIA CORPORATION.
+# SPDX-FileCopyrightText: Copyright (c) 2023-2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 # SPDX-License-Identifier: Apache-2.0
 
 set -euo pipefail
@@ -25,10 +25,6 @@ rapids-pip-retry install \
     --prefer-binary \
     -r /tmp/requirements-build.txt
 
-# build with '--no-build-isolation', for better sccache hit rate
-# 0 really means "add --no-build-isolation" (ref: https://github.com/pypa/pip/issues/5735)
-export PIP_NO_BUILD_ISOLATION=0
-
 ci/build_wheel.sh libcuvs ${package_dir}
 ci/validate_wheel.sh ${package_dir} "${RAPIDS_WHEEL_BLD_OUTPUT_DIR}"