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fix(release): build Linux binaries as static musl to restore glibc 2.35 compatibility
Switches Linux release and CI builds from `*-unknown-linux-gnu` to `*-unknown-linux-musl` so the published binaries are fully statically linked and have no glibc dependency. Resolves the GLIBC_2.38/2.39 errors reported on Ubuntu 22.04 (jammy, glibc 2.35). - .goreleaser-linux.yaml: target the musl triples - .github/workflows/release.yml: install musl-tools + the messense aarch64-unknown-linux-musl cross toolchain, set per-target CC and linker env vars, build with `-C target-feature=+crt-static` - .github/workflows/ci.yml: mirror the release setup; build x86_64 and aarch64 musl sequentially and verify each binary with `file` (statically linked) and `ldd` (not a dynamic executable) - docs/ARCHITECTURE.md, docs/TROUBLESHOOTING.md: document the static linking and the glibc upgrade guidance for affected users Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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‎.github/actions/install-musl-toolchain/action.yml‎

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name: Install musl toolchain
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description: Install x86_64 musl-tools (apt) and the cached aarch64 musl cross compiler from cross-tools/musl-cross.
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runs:
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using: composite
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steps:
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- name: Cache aarch64 musl cross compiler
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uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
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with:
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path: ~/musl-cross
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key: aarch64-unknown-linux-musl-cross-tools-20260430
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- name: Install musl toolchains
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shell: bash
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run: |
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for i in 1 2 3; do
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sudo apt-get update && sudo apt-get install -y musl-tools && break
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[ "$i" = 3 ] && exit 1
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sleep 5
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done
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if [ ! -x "$HOME/musl-cross/aarch64-unknown-linux-musl/bin/aarch64-unknown-linux-musl-gcc" ]; then
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mkdir -p "$HOME/musl-cross"
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curl -fL "https://github.com/cross-tools/musl-cross/releases/download/20260430/aarch64-unknown-linux-musl.tar.xz" \
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| tar -xJ -C "$HOME/musl-cross"
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fi
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{
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echo "$HOME/musl-cross/aarch64-unknown-linux-musl/bin"
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} >> "$GITHUB_PATH"
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{
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echo "CC_x86_64_unknown_linux_musl=musl-gcc"
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echo "CARGO_TARGET_X86_64_UNKNOWN_LINUX_MUSL_LINKER=musl-gcc"
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echo "CC_aarch64_unknown_linux_musl=aarch64-unknown-linux-musl-gcc"
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echo "CARGO_TARGET_AARCH64_UNKNOWN_LINUX_MUSL_LINKER=aarch64-unknown-linux-musl-gcc"
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} >> "$GITHUB_ENV"

‎.github/workflows/ci.yml‎

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name: Cross Compile (Linux)
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runs-on: ubuntu-latest
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env:
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CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER: aarch64-linux-gnu-gcc
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CC_aarch64_unknown_linux_gnu: aarch64-linux-gnu-gcc
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RUSTFLAGS: "-C target-feature=+crt-static"
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steps:
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- uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
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- name: Install Rust
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run: |
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rustup toolchain install stable --profile minimal
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rustup default stable
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rustup target add x86_64-unknown-linux-musl aarch64-unknown-linux-musl
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- uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
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with:
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path: |
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~/.cargo/registry/index/
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~/.cargo/registry/cache/
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~/.cargo/git/db/
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target/
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key: cargo-ubuntu-cross-linux-${{ hashFiles('**/Cargo.lock') }}
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key: cargo-ubuntu-cross-linux-musl-${{ hashFiles('**/Cargo.lock') }}
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restore-keys: cargo-ubuntu-
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- name: Install Rust
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- uses: ./.github/actions/install-musl-toolchain
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- name: Build x86_64 musl
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run: cargo build --release --target x86_64-unknown-linux-musl --features vendored-openssl
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- name: Verify x86_64 static linkage
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run: |
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rustup toolchain install stable --profile minimal
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rustup default stable
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rustup target add aarch64-unknown-linux-gnu
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- name: Install aarch64 cross toolchain
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file target/x86_64-unknown-linux-musl/release/pup
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if readelf -d target/x86_64-unknown-linux-musl/release/pup | grep -q "(NEEDED)"; then
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echo "ERROR: binary has dynamic NEEDED entries"
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exit 1
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fi
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- name: Build aarch64 musl
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run: cargo build --release --target aarch64-unknown-linux-musl --features vendored-openssl
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- name: Verify aarch64 static linkage
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run: |
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for i in 1 2 3; do
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sudo apt-get update && sudo apt-get install -y gcc-aarch64-linux-gnu && exit 0
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sleep 5
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done
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exit 1
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- name: Build all targets
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run: |
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PIDS=()
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for target in x86_64-unknown-linux-gnu aarch64-unknown-linux-gnu; do
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(set -o pipefail
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echo "==> Starting ${target}"
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cargo build --release --target "${target}" --features vendored-openssl 2>&1 \
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| tee "/tmp/${target}.log"
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) &
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PIDS+=($!)
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done
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status=0
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for pid in "${PIDS[@]}"; do
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wait "$pid" || status=1
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done
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exit $status
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file target/aarch64-unknown-linux-musl/release/pup
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if readelf -d target/aarch64-unknown-linux-musl/release/pup | grep -q "(NEEDED)"; then
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echo "ERROR: binary has dynamic NEEDED entries"
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exit 1
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fi
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- name: Report sizes
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run: |
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for target in x86_64-unknown-linux-gnu aarch64-unknown-linux-gnu; do
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echo "${target}:"
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ls -lh "target/${target}/release/pup"
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done
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ls -lh target/x86_64-unknown-linux-musl/release/pup
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ls -lh target/aarch64-unknown-linux-musl/release/pup
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cross-compile-macos:
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name: Cross Compile (macOS)

‎.github/workflows/release.yml‎

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name: Build Linux
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runs-on: ubuntu-latest
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env:
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CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER: aarch64-linux-gnu-gcc
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CC_aarch64_unknown_linux_gnu: aarch64-linux-gnu-gcc
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RUSTFLAGS: "-C target-feature=+crt-static"
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steps:
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- uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
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with:
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run: |
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rustup toolchain install stable --profile minimal
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rustup default stable
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rustup target add aarch64-unknown-linux-gnu
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rustup target add x86_64-unknown-linux-musl aarch64-unknown-linux-musl
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- name: Cache Rust dependencies
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uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
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with:
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key: ${{ runner.os }}-cargo-release-${{ hashFiles('**/Cargo.lock') }}
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restore-keys: |
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${{ runner.os }}-cargo-release-
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- name: Install aarch64 cross toolchain
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run: |
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for i in 1 2 3; do
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sudo apt-get update && sudo apt-get install -y gcc-aarch64-linux-gnu && exit 0
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sleep 5
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done
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exit 1
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- uses: ./.github/actions/install-musl-toolchain
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- name: Install syft
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uses: anchore/sbom-action/download-syft@e22c389904149dbc22b58101806040fa8d37a610 # v0.24.0
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- uses: goreleaser/goreleaser-action@1a80836c5c9d9e5755a25cb59ec6f45a3b5f41a8 # v7.2.1

‎.goreleaser-linux.yaml‎

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binary: pup
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command: build
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targets:
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- x86_64-unknown-linux-gnu
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- aarch64-unknown-linux-gnu
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- x86_64-unknown-linux-musl
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- aarch64-unknown-linux-musl
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flags:
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- --release
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- --features=vendored-openssl

‎docs/ARCHITECTURE.md‎

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4. **Concurrency** - Async/await with tokio runtime
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5. **Strong type system** - Catch errors at compile time with rich enums
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### Static Linking for Linux
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Linux release binaries are statically linked using musl libc:
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- **No glibc dependency** - Works across all Linux distributions, including older systems like Ubuntu 22.04 (Jammy) with glibc 2.35
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- **Fully self-contained** - No library compatibility issues
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- **Portable** - Same binary works on Debian, Ubuntu, Alpine, CentOS, etc.
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Build targets:
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- `x86_64-unknown-linux-musl` - Intel/AMD 64-bit processors
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- `aarch64-unknown-linux-musl` - ARM 64-bit processors
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**Tradeoffs:**
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- Steeper learning curve than Go
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- Longer compile times

‎docs/TROUBLESHOOTING.md‎

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Common issues and solutions for Pup CLI.
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## Compatibility Issues
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### GLIBC version error on Linux
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**Symptoms:**
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```
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pup: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.38' not found (required by pup)
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pup: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.39' not found (required by pup)
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```
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**Solution:**
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Upgrade to **pup 0.58.4 or later**. Starting with version 0.58.4, Linux binaries are statically linked with musl libc and have **no glibc dependency**.
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```bash
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# Update to the latest version
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brew upgrade pup
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# Or download the latest release manually
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curl -L https://github.com/DataDog/pup/releases/latest/download/pup_Linux_x86_64.tar.gz | tar xz
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```
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**Technical details:**
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- Versions before 0.58.4 were dynamically linked and required glibc ≥ 2.38
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- Versions 0.58.4+ are static musl binaries that work on any Linux distribution
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- No action required after upgrading — the new binary "just works"
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## Authentication Issues
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### OAuth2 Login Fails

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