ci/container: Add script to build Perfetto tracebox

Add a script to build Perfetto’s tracebox tool for x86_64 and arm64
targets on Linux and Android.

Signed-off-by: Laura Nao <laura.nao@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38517>

.gitlab-ci/container/build-perfetto.sh

@@ -0,0 +1,77 @@
+#!/usr/bin/env bash
+
+set -uex
+
+section_start perfetto "Building perfetto"
+
+BASE_PWD=$PWD
+
+PERFETTO_REVISION=$(grep 'revision =' subprojects/perfetto.wrap | cut -d ' ' -f3)
+
+patch_files=(
+  "build-perfetto-Fix-C-standard-library-build-errors-with-Debian-13.patch"
+)
+
+# Set PERFETTO_ARCH based on DEBIAN_ARCH
+if [[ -z "${PERFETTO_ARCH:-}" ]]; then
+  case "$DEBIAN_ARCH" in
+    amd64) PERFETTO_ARCH=x64;;
+    arm64) PERFETTO_ARCH=arm64;;
+  esac
+fi
+
+git clone --branch "$PERFETTO_REVISION" --depth 1 https://github.com/google/perfetto /perfetto
+
+pushd /perfetto
+
+for patch in "${patch_files[@]}"; do
+  echo "Applying patch: $patch"
+  git am "$BASE_PWD/.gitlab-ci/container/patches/$patch"
+done
+
+# Base GN args
+mkdir -p _build
+cat >_build/args.gn <<EOF
+is_debug=false
+target_cpu="${PERFETTO_ARCH}"
+target_os="${PERFETTO_TARGET}"
+EOF
+
+case "$PERFETTO_TARGET" in
+linux)
+        # Override Perfetto’s default toolchain selection here, as the bundled
+        # arm64 toolchain is an x86-64 -> arm64 cross-compiler.
+        cat >>_build/args.gn <<EOF
+is_system_compiler = true
+is_hermetic_clang = false
+ar = "ar"
+cc = "clang-${LLVM_VERSION}"
+cxx = "clang++-${LLVM_VERSION}"
+extra_ldflags = "-fuse-ld=lld-${LLVM_VERSION} -lpthread -ldl"
+EOF
+        ./tools/install-build-deps
+        ;;
+android)
+        # No additional args needed when cross-building for Android
+        ./tools/install-build-deps --android
+        ;;
+*)
+        echo "Unexpected PERFETTO_TARGET value: $PERFETTO_TARGET"
+        exit 1
+        ;;
+esac
+
+./tools/gn gen _build/
+./tools/ninja -C _build/ tracebox
+
+mkdir -p build
+cp _build/tracebox build/
+
+"${STRIP_CMD:-strip}" build/tracebox || true
+
+# Cleanup everything except build/
+find . -mindepth 1 -maxdepth 1 ! -name build -exec rm -rf {} +
+
+popd
+
+section_end perfetto