feat(profiling): Wrap libunwind in a crate

.github/CODEOWNERS

@@ -14,6 +14,7 @@
 .gitlab-ci.yml                       @DataDog/apm-common-components-core
 .gitlab/benchmarks.yml               @DataDog/apm-common-components-core
 .gitlab/fuzz.yml                     @DataDog/chaos-platform
+.gitmodules                          @DataDog/libdatadog
 benchmark/                           @DataDog/apm-common-components-core
 bin_tests/                           @DataDog/libdatadog-profiling
 build-common/                        @DataDog/apm-common-components-core
@@ -44,6 +45,7 @@ libdd-data-pipeline*/                @DataDog/libdatadog-apm
 libdd-ddsketch*/                     @DataDog/libdatadog-apm @DataDog/apm-common-components-core
 libdd-dogstatsd-client               @DataDog/apm-common-components-core
 libdd-library-config*/               @DataDog/apm-sdk-capabilities
+libdd-libunwind*/                    @DataDog/libdatadog-profiling
 libdd-log*/                          @DataDog/apm-common-components-core
 libdd-profiling*/                    @DataDog/libdatadog-profiling
 libdd-telemetry*/                    @DataDog/apm-common-components-core

.github/workflows/coverage.yml

@@ -26,6 +26,8 @@ jobs:
           docker-images: true
           swap-storage: true
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # 4.2.2
+        with:
+          submodules: recursive
       - name: Install Rust
         run: rustup install nightly-2026-02-08 && rustup default nightly-2026-02-08
       - name: Install cargo-llvm-cov

.github/workflows/lint.yml

@@ -10,6 +10,8 @@ jobs:
     steps:
       - name: Checkout sources
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # 4.2.2
+        with:
+          submodules: recursive
       - name: Run actionlint
         uses: devops-actions/actionlint@c6744a34774e4e1c1df0ff66bdb07ec7ee480ca0 # 0.1.9
         with:
@@ -22,6 +24,8 @@ jobs:
     steps:
       - name: Checkout sources
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # 4.2.2
+        with:
+          submodules: recursive
       - name: Install nightly-2026-02-08 toolchain and rustfmt
         run: rustup install nightly-2026-02-08 && rustup default nightly-2026-02-08 && rustup component add rustfmt
       - name: Cache [rust]
@@ -41,6 +45,8 @@ jobs:
     steps:
       - name: Checkout sources
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # 4.2.2
+        with:
+          submodules: recursive
       - name: Install ${{ matrix.rust_version }} toolchain and clippy
         run: rustup install ${{ matrix.rust_version }} && rustup default ${{ matrix.rust_version }} && rustup component add clippy
       - name: Cache [rust]

.github/workflows/miri.yml

@@ -14,6 +14,8 @@ jobs:
       PROPTEST_CASES: 1
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # 4.2.2
+        with:
+          submodules: recursive
       - name: Set up Rust
         run: |
           set -e

.github/workflows/test.yml

@@ -36,6 +36,8 @@ jobs:
           swap-storage: true
       - name: Checkout sources
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # 4.2.2
+        with:
+          submodules: recursive
       - name: Install Rust ${{ matrix.rust_version }}
         if: matrix.rust_version != ''
         run: rustup install ${{ matrix.rust_version }} && rustup default ${{ matrix.rust_version }}
@@ -155,6 +157,8 @@ jobs:
     steps:
       - name: Checkout sources
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # 4.2.2
+        with:
+          submodules: recursive
       - name: Setup output dir
         shell: bash
         run: |
@@ -297,6 +301,8 @@ jobs:
           swap-storage: true
       - name: Checkout
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # 4.2.2
+        with:
+          submodules: recursive
       - name: Cache [rust]
         uses: Swatinem/rust-cache@f13886b937689c021905a6b90929199931d60db1 # 2.8.1
         with:
@@ -321,6 +327,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # 4.2.2
+        with:
+          submodules: recursive
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@b5ca514318bd6ebac0fb2aedd5d36ec1b5c232a2 # 3.10.0
         with:

.gitmodules

@@ -0,0 +1,4 @@
+[submodule "libdd-libunwind-sys/libunwind"]
+	path = libdd-libunwind-sys/libunwind
+	url = https://github.com/DataDog/libunwind.git
+	branch = kevin/v1.8.1-custom-2

Cargo.toml

@@ -46,7 +46,7 @@ members = [
   "libdd-tinybytes",
   "libdd-dogstatsd-client",
   "libdd-log",
-  "libdd-log-ffi",
+  "libdd-log-ffi", "libdd-libunwind-sys",
 ]
 
 # https://doc.rust-lang.org/cargo/reference/resolver.html

LICENSE-3rdparty.yml

@@ -1,4 +1,4 @@
-root_name: builder, build_common, tools, libdd-alloc, libdd-crashtracker, libdd-common, libdd-telemetry, libdd-ddsketch, libdd-crashtracker-ffi, libdd-common-ffi, datadog-ffe, datadog-ffe-ffi, datadog-ipc, datadog-ipc-macros, libdd-tinybytes, tarpc, tarpc-plugins, spawn_worker, cc_utils, libdd-library-config, libdd-library-config-ffi, datadog-live-debugger, libdd-data-pipeline, libdd-dogstatsd-client, libdd-trace-protobuf, libdd-trace-stats, libdd-trace-utils, libdd-trace-normalization, libdd-log, datadog-live-debugger-ffi, libdd-profiling, libdd-profiling-protobuf, libdd-profiling-ffi, libdd-data-pipeline-ffi, libdd-ddsketch-ffi, libdd-log-ffi, libdd-telemetry-ffi, symbolizer-ffi, datadog-profiling-replayer, datadog-remote-config, datadog-sidecar, datadog-sidecar-macros, datadog-sidecar-ffi, libdd-trace-obfuscation, datadog-tracer-flare, sidecar_mockgen, test_spawn_from_lib
+root_name: builder, build_common, tools, libdd-alloc, libdd-crashtracker, libdd-common, libdd-telemetry, libdd-ddsketch, libdd-crashtracker-ffi, libdd-common-ffi, datadog-ffe, datadog-ffe-ffi, datadog-ipc, datadog-ipc-macros, libdd-tinybytes, tarpc, tarpc-plugins, spawn_worker, cc_utils, libdd-library-config, libdd-library-config-ffi, datadog-live-debugger, libdd-data-pipeline, libdd-dogstatsd-client, libdd-trace-protobuf, libdd-trace-stats, libdd-trace-utils, libdd-trace-normalization, libdd-log, datadog-live-debugger-ffi, libdd-profiling, libdd-profiling-protobuf, libdd-profiling-ffi, libdd-data-pipeline-ffi, libdd-ddsketch-ffi, libdd-log-ffi, libdd-telemetry-ffi, symbolizer-ffi, datadog-profiling-replayer, datadog-remote-config, datadog-sidecar, datadog-sidecar-macros, datadog-sidecar-ffi, libdd-trace-obfuscation, datadog-tracer-flare, sidecar_mockgen, test_spawn_from_lib, bin_tests
 third_party_libraries:
 - package_name: addr2line
   package_version: 0.24.2

libdd-libunwind-sys/Cargo.toml

@@ -0,0 +1,19 @@
+[package]
+name = "libdd-libunwind"
+edition.workspace = true
+version.workspace = true
+rust-version.workspace = true
+license.workspace = true
+publish = false
+links = "unwind"  # Tells Cargo this crate links to libunwind (prevents multiple builds)
+
+[lib]
+crate-type = ["lib"]
+bench = false
+
+[dependencies]
+paste = "1.0"
+libc = "0.2"
+
+[build-dependencies]
+cc = "1.0"

libdd-libunwind-sys/build.rs

@@ -0,0 +1,137 @@
+// Copyright 2025-Present Datadog, Inc. https://www.datadoghq.com/
+// SPDX-License-Identifier: Apache-2.0
+
+fn main() {
+    #[cfg(target_os = "linux")]
+    linux::main();
+}
+
+#[cfg(target_os = "linux")]
+mod linux {
+    use std::env;
+    use std::path::PathBuf;
+
+    pub(crate) fn main() {
+        let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
+        let build_dir = out_dir.join("libunwind_build");
+        let manifest_dir = std::env::var("CARGO_MANIFEST_DIR").unwrap();
+        let libunwind_dir = std::path::Path::new(&manifest_dir).join("libunwind");
+
+        if !libunwind_dir.join("src").exists() {
+            panic!(
+                "libunwind source not found at {}. \
+                 Did you forget to run `git submodule update --init`?",
+                libunwind_dir.display()
+            );
+        }
+
+        // Check if libunwind submodule is initialized
+        if !libunwind_dir.exists() || std::fs::read_dir(&libunwind_dir).unwrap().next().is_none() {
+            panic!(
+                "libunwind submodule not initialized!\n\
+                 Run: git submodule update --init --recursive\n\
+                 \n\
+                 For CI, ensure your workflow checks out submodules:\n\
+                 - GitHub Actions: add 'submodules: recursive' to actions/checkout\n\
+                 - GitLab CI: add 'GIT_SUBMODULE_STRATEGY: recursive'\n\
+                 \n\
+                 Directory checked: {}",
+                libunwind_dir.display()
+            );
+        }
+
+        std::fs::create_dir_all(&build_dir).unwrap();
+
+        let lib_file = build_dir.join("src/.libs/libunwind.a");
+
+        // Only build if library doesn't exist
+        if !lib_file.exists() {
+            eprintln!("Building libunwind from source...");
+
+            // Only run autoreconf if configure doesn't exist
+            let configure_script = libunwind_dir.join("configure");
+            if !configure_script.exists() {
+                eprintln!("Running autoreconf...");
+                let status = std::process::Command::new("sh")
+                    .current_dir(&libunwind_dir)
+                    .args(["-c", "autoreconf -i"])
+                    .status()
+                    .expect(
+                        "Failed to run autoreconf. Install with: apt install autoconf automake libtool",
+                    );
+
+                if !status.success() {
+                    panic!("autoreconf failed with exit code: {:?}", status.code());
+                }
+            }
+
+            eprintln!("Configuring libunwind...");
+            let status = std::process::Command::new("sh")
+                .current_dir(&build_dir)
+                .args([
+                    "-c",
+                    &format!(
+                        r"{}/configure CXXFLAGS=-fPIC\ -D_GLIBCXX_USE_CXX11_ABI=0\ -O3\ -g CFLAGS=-fPIC\ -O3\ -g --disable-shared --enable-static --disable-minidebuginfo --disable-zlibdebuginfo --disable-tests",
+                        libunwind_dir.display()
+                    )
+                ])
+                .status()
+                .expect("Failed to run configure");
+
+            if !status.success() {
+                panic!(
+                    "libunwind configure failed with exit code: {:?}",
+                    status.code()
+                );
+            }
+
+            eprintln!("Building libunwind...");
+            let status = std::process::Command::new("sh")
+                .current_dir(&build_dir)
+                .args(["-c", "make -j$(nproc)"])
+                .status()
+                .expect("Failed to run make");
+
+            if !status.success() {
+                panic!("libunwind make failed with exit code: {:?}", status.code());
+            }
+
+            // Verify the library was actually created
+            if !lib_file.exists() {
+                panic!(
+                    "libunwind.a was not created at expected location: {}",
+                    lib_file.display()
+                );
+            }
+
+            eprintln!("libunwind built successfully at {}", lib_file.display());
+        } else {
+            eprintln!("Using cached libunwind build");
+        }
+
+        let lib_path = build_dir.join("src/.libs");
+        let include_path = build_dir.join("include");
+
+        #[cfg(target_arch = "x86_64")]
+        let arch = "x86_64";
+        #[cfg(target_arch = "aarch64")]
+        let arch = "aarch64";
+
+        // Link directives for this crate
+        println!("cargo:rustc-link-search=native={}", lib_path.display());
+        println!("cargo:rustc-link-lib=static=unwind");
+        println!("cargo:rustc-link-lib=static=unwind-{}", arch);
+
+        // Export paths to dependent crates via DEP_UNWIND_* environment variables
+        println!("cargo:include={}", include_path.display());
+        println!("cargo:lib={}", lib_path.display());
+        println!("cargo:libdir={}", lib_path.display());
+        println!("cargo:root={}", build_dir.display());
+
+        eprintln!("libunwind library ready at {}", lib_path.display());
+
+        println!("cargo:rerun-if-changed={}/src", libunwind_dir.display());
+        println!("cargo:rerun-if-changed={}/include", libunwind_dir.display());
+        println!("cargo:rerun-if-changed=build.rs");
+    }
+}