Include libucontext in static builds to vendor libunwind even on POWER. (#19817)

packaging/makeself/bundled-packages.version

@@ -3,6 +3,8 @@ PACKAGES=("OPENSSL" "CURL" "BASH" "IOPING" "LIBNETFILTER_ACT")
 SOURCE_TYPES=("GH_REPO_CLONE" "GH_REPO_CLONE" "DW_TARBALL" "GH_REPO_SOURCE" "DW_TARBALL")
 OPENSSL_VERSION="openssl-3.4.0"
 OPENSSL_SOURCE="https://github.com/openssl/openssl"
+LIBUCONTEXT_VERSION="libucontext-1.3.2"
+LIBUCONTEXT_SOURCE="https://github.com/kaniini/libucontext"
 LIBUNWIND_VERSION="177deb5f89c5d792c9618db54fdcebd260e271e8" # Should be updated to a stable version once https://github.com/libunwind/libunwind/issues/742 is fixed.
 LIBUNWIND_SOURCE="https://github.com/libunwind/libunwind"
 CURL_VERSION="curl-8_11_1"

packaging/makeself/jobs/15-libucontext.install.sh

@@ -0,0 +1,48 @@
+#!/usr/bin/env bash
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+# shellcheck source=packaging/makeself/functions.sh
+. "$(dirname "${0}")/../functions.sh" "${@}" || exit 1
+# Source of truth for all the packages we bundle in static builds
+. "$(dirname "${0}")/../bundled-packages.version"
+# shellcheck disable=SC2015
+[ "${GITHUB_ACTIONS}" = "true" ] && echo "::group::Building libucontext" || true
+
+export CFLAGS="${TUNING_FLAGS} -pipe"
+export CXXFLAGS="${CFLAGS}"
+export LDFLAGS=""
+
+if [ -d "${NETDATA_MAKESELF_PATH}/tmp/libucontext" ]; then
+  rm -rf "${NETDATA_MAKESELF_PATH}/tmp/libucontext"
+fi
+
+cache="${NETDATA_SOURCE_PATH}/artifacts/cache/${BUILDARCH}/libucontext"
+
+if [ -d "${cache}" ]; then
+  echo "Found cached copy of build directory for libucontext, using it."
+  cp -a "${cache}/libucontext" "${NETDATA_MAKESELF_PATH}/tmp/"
+  CACHE_HIT=1
+else
+  echo "No cached copy of build directory for libucontext found, fetching sources instead."
+  run git clone --branch "${LIBUCONTEXT_VERSION}" --single-branch --depth 1 "${LIBUCONTEXT_SOURCE}" "${NETDATA_MAKESELF_PATH}/tmp/libucontext"
+  CACHE_HIT=0
+fi
+
+cd "${NETDATA_MAKESELF_PATH}/tmp/libucontext" || exit 1
+
+case "${BUILDARCH}" in
+    armv6l|armv7l) arch=arm ;;
+    ppc64le) arch=ppc64 ;;
+    *) arch="${BUILDARCH}" ;;
+esac
+
+if [ "${CACHE_HIT:-0}" -eq 0 ]; then
+    run make ARCH="${arch}" EXPORT_UNPREFIXED="yes" -j "$(nproc)"
+fi
+
+run make ARCH="${arch}" EXPORT_UNPREFIXED="yes" DESTDIR="/libucontext-static" -j "$(nproc)" install
+
+store_cache libucontext "${NETDATA_MAKESELF_PATH}/tmp/libucontext"
+
+# shellcheck disable=SC2015
+[ "${GITHUB_ACTIONS}" = "true" ] && echo "::endgroup::" || true

packaging/makeself/jobs/20-libunwind.install.sh

@@ -1,9 +1,6 @@
 #!/usr/bin/env bash
 # SPDX-License-Identifier: GPL-3.0-or-later
 
-# Can’t do libunwind on ppc64le with musl, so skip it.
-[ "${BUILDARCH}" = "ppc64le" ] && exit 0
-
 # shellcheck source=packaging/makeself/functions.sh
 . "$(dirname "${0}")/../functions.sh" "${@}" || exit 1
 # Source of truth for all the packages we bundle in static builds
@@ -11,9 +8,9 @@
 # shellcheck disable=SC2015
 [ "${GITHUB_ACTIONS}" = "true" ] && echo "::group::Building libunwind" || true
 
-export CFLAGS="${TUNING_FLAGS} -fno-lto -pipe"
+export CFLAGS="${TUNING_FLAGS} -I/libucontext-static/usr/include -fno-lto -pipe"
 export CXXFLAGS="${CFLAGS}"
-export LDFLAGS="-static"
+export LDFLAGS="-static -L/libucontext-static/usr/lib/ -lucontext"
 export PKG_CONFIG="pkg-config --static"
 
 if [ -d "${NETDATA_MAKESELF_PATH}/tmp/libunwind" ]; then