livekit: Use our build of libwebrtc.a (#51433)

Closes #51339

This should address issues with too new libstdc++.so on older/more
conservative distros such as RHEL9.

Release Notes:

- Relaxed requirement for libstdc++.so available on Linux distros.

.cargo/ci-config.toml

@@ -15,14 +15,4 @@ rustflags = ["-D", "warnings"]
 [profile.dev]
 debug = "limited"
 
-# Use Mold on Linux, because it's faster than GNU ld and LLD.
-#
-# We no longer set this in the default `config.toml` so that developers can opt in to Wild, which
-# is faster than Mold, in their own ~/.cargo/config.toml.
-[target.x86_64-unknown-linux-gnu]
-linker = "clang"
-rustflags = ["-C", "link-arg=-fuse-ld=mold"]
 
-[target.aarch64-unknown-linux-gnu]
-linker = "clang"
-rustflags = ["-C", "link-arg=-fuse-ld=mold"]

.cargo/config.toml

@@ -16,5 +16,9 @@ rustflags = [
     "target-feature=+crt-static", # This fixes the linking issue when compiling livekit on Windows
 ]
 
+# We need lld to link libwebrtc.a successfully on aarch64-linux
+[target.aarch64-unknown-linux-gnu]
+rustflags = ["-C", "link-arg=-fuse-ld=lld"]
+
 [env]
 MACOSX_DEPLOYMENT_TARGET = "10.15.7"

.github/workflows/autofix_pr.yml

@@ -37,8 +37,6 @@ jobs:
         path: ~/.rustup
     - name: steps::setup_linux
       run: ./script/linux
-    - name: steps::install_mold
-      run: ./script/install-mold
     - name: steps::download_wasi_sdk
       run: ./script/download-wasi-sdk
     - name: steps::setup_pnpm

.github/workflows/compare_perf.yml

@@ -30,8 +30,6 @@ jobs:
         cp ./.cargo/ci-config.toml ./../.cargo/config.toml
     - name: steps::setup_linux
       run: ./script/linux
-    - name: steps::install_mold
-      run: ./script/install-mold
     - name: steps::download_wasi_sdk
       run: ./script/download-wasi-sdk
     - name: compare_perf::run_perf::install_hyperfine

.github/workflows/deploy_collab.yml

@@ -32,8 +32,6 @@ jobs:
         path: ~/.rustup
     - name: steps::setup_linux
       run: ./script/linux
-    - name: steps::install_mold
-      run: ./script/install-mold
     - name: steps::download_wasi_sdk
       run: ./script/download-wasi-sdk
     - name: steps::cargo_fmt
@@ -65,8 +63,6 @@ jobs:
         path: ~/.rustup
     - name: steps::setup_linux
       run: ./script/linux
-    - name: steps::install_mold
-      run: ./script/install-mold
     - name: steps::download_wasi_sdk
       run: ./script/download-wasi-sdk
     - name: steps::cargo_install_nextest

.github/workflows/release.yml

@@ -72,8 +72,6 @@ jobs:
         path: ~/.rustup
     - name: steps::setup_linux
       run: ./script/linux
-    - name: steps::install_mold
-      run: ./script/install-mold
     - name: steps::download_wasi_sdk
       run: ./script/download-wasi-sdk
     - name: steps::setup_node
@@ -199,8 +197,6 @@ jobs:
         path: ~/.rustup
     - name: steps::setup_linux
       run: ./script/linux
-    - name: steps::install_mold
-      run: ./script/install-mold
     - name: steps::download_wasi_sdk
       run: ./script/download-wasi-sdk
     - name: steps::setup_sccache
@@ -318,8 +314,6 @@ jobs:
         token: ${{ secrets.SENTRY_AUTH_TOKEN }}
     - name: steps::setup_linux
       run: ./script/linux
-    - name: steps::install_mold
-      run: ./script/install-mold
     - name: steps::download_wasi_sdk
       run: ./script/download-wasi-sdk
     - name: ./script/bundle-linux
@@ -360,8 +354,6 @@ jobs:
         token: ${{ secrets.SENTRY_AUTH_TOKEN }}
     - name: steps::setup_linux
       run: ./script/linux
-    - name: steps::install_mold
-      run: ./script/install-mold
     - name: steps::download_wasi_sdk
       run: ./script/download-wasi-sdk
     - name: ./script/bundle-linux

.github/workflows/release_nightly.yml

@@ -122,8 +122,6 @@ jobs:
         token: ${{ secrets.SENTRY_AUTH_TOKEN }}
     - name: steps::setup_linux
       run: ./script/linux
-    - name: steps::install_mold
-      run: ./script/install-mold
     - name: steps::download_wasi_sdk
       run: ./script/download-wasi-sdk
     - name: ./script/bundle-linux
@@ -170,8 +168,6 @@ jobs:
         token: ${{ secrets.SENTRY_AUTH_TOKEN }}
     - name: steps::setup_linux
       run: ./script/linux
-    - name: steps::install_mold
-      run: ./script/install-mold
     - name: steps::download_wasi_sdk
       run: ./script/download-wasi-sdk
     - name: ./script/bundle-linux

.github/workflows/run_agent_evals.yml

@@ -34,8 +34,6 @@ jobs:
         path: ~/.rustup
     - name: steps::setup_linux
       run: ./script/linux
-    - name: steps::install_mold
-      run: ./script/install-mold
     - name: steps::download_wasi_sdk
       run: ./script/download-wasi-sdk
     - name: steps::setup_cargo_config

.github/workflows/run_bundling.yml

@@ -32,8 +32,6 @@ jobs:
         token: ${{ secrets.SENTRY_AUTH_TOKEN }}
     - name: steps::setup_linux
       run: ./script/linux
-    - name: steps::install_mold
-      run: ./script/install-mold
     - name: steps::download_wasi_sdk
       run: ./script/download-wasi-sdk
     - name: ./script/bundle-linux
@@ -73,8 +71,6 @@ jobs:
         token: ${{ secrets.SENTRY_AUTH_TOKEN }}
     - name: steps::setup_linux
       run: ./script/linux
-    - name: steps::install_mold
-      run: ./script/install-mold
     - name: steps::download_wasi_sdk
       run: ./script/download-wasi-sdk
     - name: ./script/bundle-linux

.github/workflows/run_cron_unit_evals.yml

@@ -35,8 +35,6 @@ jobs:
         path: ~/.rustup
     - name: steps::setup_linux
       run: ./script/linux
-    - name: steps::install_mold
-      run: ./script/install-mold
     - name: steps::download_wasi_sdk
       run: ./script/download-wasi-sdk
     - name: steps::cargo_install_nextest

.github/workflows/run_tests.yml

@@ -218,8 +218,6 @@ jobs:
         path: ~/.rustup
     - name: steps::setup_linux
       run: ./script/linux
-    - name: steps::install_mold
-      run: ./script/install-mold
     - name: steps::download_wasi_sdk
       run: ./script/download-wasi-sdk
     - name: steps::setup_sccache
@@ -331,8 +329,6 @@ jobs:
         path: ~/.rustup
     - name: steps::setup_linux
       run: ./script/linux
-    - name: steps::install_mold
-      run: ./script/install-mold
     - name: steps::download_wasi_sdk
       run: ./script/download-wasi-sdk
     - name: steps::setup_node
@@ -430,8 +426,6 @@ jobs:
         path: ~/.rustup
     - name: steps::setup_linux
       run: ./script/linux
-    - name: steps::install_mold
-      run: ./script/install-mold
     - name: steps::download_wasi_sdk
       run: ./script/download-wasi-sdk
     - name: steps::setup_cargo_config
@@ -480,8 +474,6 @@ jobs:
         path: ~/.rustup
     - name: steps::setup_linux
       run: ./script/linux
-    - name: steps::install_mold
-      run: ./script/install-mold
     - name: steps::download_wasi_sdk
       run: ./script/download-wasi-sdk
     - name: steps::setup_sccache
@@ -606,8 +598,6 @@ jobs:
         jobSummary: false
     - name: steps::setup_linux
       run: ./script/linux
-    - name: steps::install_mold
-      run: ./script/install-mold
     - name: steps::download_wasi_sdk
       run: ./script/download-wasi-sdk
     - name: ./script/generate-action-metadata

.github/workflows/run_unit_evals.yml

@@ -38,8 +38,6 @@ jobs:
         path: ~/.rustup
     - name: steps::setup_linux
       run: ./script/linux
-    - name: steps::install_mold
-      run: ./script/install-mold
     - name: steps::download_wasi_sdk
       run: ./script/download-wasi-sdk
     - name: steps::cargo_install_nextest

Cargo.lock

@@ -9758,7 +9758,7 @@ dependencies = [
 [[package]]
 name = "libwebrtc"
 version = "0.3.26"
-source = "git+https://github.com/zed-industries/livekit-rust-sdks?rev=37835f840d0070d45ac8b31cce6a6ae7aca3f459#37835f840d0070d45ac8b31cce6a6ae7aca3f459"
+source = "git+https://github.com/zed-industries/livekit-rust-sdks?rev=cf4375b244ebb51702968df7fc36e192d0f45ad5#cf4375b244ebb51702968df7fc36e192d0f45ad5"
 dependencies = [
  "cxx",
  "glib",
@@ -9856,7 +9856,7 @@ checksum = "11d3d7f243d5c5a8b9bb5d6dd2b1602c0cb0b9db1621bafc7ed66e35ff9fe092"
 [[package]]
 name = "livekit"
 version = "0.7.32"
-source = "git+https://github.com/zed-industries/livekit-rust-sdks?rev=37835f840d0070d45ac8b31cce6a6ae7aca3f459#37835f840d0070d45ac8b31cce6a6ae7aca3f459"
+source = "git+https://github.com/zed-industries/livekit-rust-sdks?rev=cf4375b244ebb51702968df7fc36e192d0f45ad5#cf4375b244ebb51702968df7fc36e192d0f45ad5"
 dependencies = [
  "base64 0.22.1",
  "bmrng",
@@ -9882,7 +9882,7 @@ dependencies = [
 [[package]]
 name = "livekit-api"
 version = "0.4.14"
-source = "git+https://github.com/zed-industries/livekit-rust-sdks?rev=37835f840d0070d45ac8b31cce6a6ae7aca3f459#37835f840d0070d45ac8b31cce6a6ae7aca3f459"
+source = "git+https://github.com/zed-industries/livekit-rust-sdks?rev=cf4375b244ebb51702968df7fc36e192d0f45ad5#cf4375b244ebb51702968df7fc36e192d0f45ad5"
 dependencies = [
  "base64 0.21.7",
  "futures-util",
@@ -9909,7 +9909,7 @@ dependencies = [
 [[package]]
 name = "livekit-protocol"
 version = "0.7.1"
-source = "git+https://github.com/zed-industries/livekit-rust-sdks?rev=37835f840d0070d45ac8b31cce6a6ae7aca3f459#37835f840d0070d45ac8b31cce6a6ae7aca3f459"
+source = "git+https://github.com/zed-industries/livekit-rust-sdks?rev=cf4375b244ebb51702968df7fc36e192d0f45ad5#cf4375b244ebb51702968df7fc36e192d0f45ad5"
 dependencies = [
  "futures-util",
  "livekit-runtime",
@@ -9925,7 +9925,7 @@ dependencies = [
 [[package]]
 name = "livekit-runtime"
 version = "0.4.0"
-source = "git+https://github.com/zed-industries/livekit-rust-sdks?rev=37835f840d0070d45ac8b31cce6a6ae7aca3f459#37835f840d0070d45ac8b31cce6a6ae7aca3f459"
+source = "git+https://github.com/zed-industries/livekit-rust-sdks?rev=cf4375b244ebb51702968df7fc36e192d0f45ad5#cf4375b244ebb51702968df7fc36e192d0f45ad5"
 dependencies = [
  "tokio",
  "tokio-stream",
@@ -19953,7 +19953,7 @@ dependencies = [
 [[package]]
 name = "webrtc-sys"
 version = "0.3.23"
-source = "git+https://github.com/zed-industries/livekit-rust-sdks?rev=37835f840d0070d45ac8b31cce6a6ae7aca3f459#37835f840d0070d45ac8b31cce6a6ae7aca3f459"
+source = "git+https://github.com/zed-industries/livekit-rust-sdks?rev=cf4375b244ebb51702968df7fc36e192d0f45ad5#cf4375b244ebb51702968df7fc36e192d0f45ad5"
 dependencies = [
  "cc",
  "cxx",
@@ -19967,7 +19967,7 @@ dependencies = [
 [[package]]
 name = "webrtc-sys-build"
 version = "0.3.13"
-source = "git+https://github.com/zed-industries/livekit-rust-sdks?rev=37835f840d0070d45ac8b31cce6a6ae7aca3f459#37835f840d0070d45ac8b31cce6a6ae7aca3f459"
+source = "git+https://github.com/zed-industries/livekit-rust-sdks?rev=cf4375b244ebb51702968df7fc36e192d0f45ad5#cf4375b244ebb51702968df7fc36e192d0f45ad5"
 dependencies = [
  "anyhow",
  "fs2",

Cargo.toml

@@ -845,8 +845,8 @@ notify = { git = "https://github.com/zed-industries/notify.git", rev = "ce58c24c
 notify-types = { git = "https://github.com/zed-industries/notify.git", rev = "ce58c24cad542c28e04ced02e20325a4ec28a31d" }
 windows-capture = { git = "https://github.com/zed-industries/windows-capture.git", rev = "f0d6c1b6691db75461b732f6d5ff56eed002eeb9" }
 calloop = { git = "https://github.com/zed-industries/calloop" }
-livekit = { git = "https://github.com/zed-industries/livekit-rust-sdks", rev = "37835f840d0070d45ac8b31cce6a6ae7aca3f459" }
-libwebrtc = { git = "https://github.com/zed-industries/livekit-rust-sdks", rev = "37835f840d0070d45ac8b31cce6a6ae7aca3f459" }
+livekit = { git = "https://github.com/zed-industries/livekit-rust-sdks", rev = "cf4375b244ebb51702968df7fc36e192d0f45ad5" }
+libwebrtc = { git = "https://github.com/zed-industries/livekit-rust-sdks", rev = "cf4375b244ebb51702968df7fc36e192d0f45ad5" }
 
 [profile.dev]
 split-debuginfo = "unpacked"

script/bundle-linux

@@ -74,7 +74,15 @@ fi
 export CC=${CC:-$(which clang)}
 
 # Build binary in release mode
-export RUSTFLAGS="${RUSTFLAGS:-} -C link-args=-Wl,--disable-new-dtags,-rpath,\$ORIGIN/../lib"
+# We need lld to link libwebrtc.a successfully on aarch64-linux.
+# NOTE: Since RUSTFLAGS env var overrides all .cargo/config.toml rustflags
+# (see https://github.com/rust-lang/cargo/issues/5376), the
+# [target.aarch64-unknown-linux-gnu] section in config.toml has no effect here.
+if [[ "$(uname -m)" == "aarch64" ]]; then
+    export RUSTFLAGS="${RUSTFLAGS:-} -C link-arg=-fuse-ld=lld -C link-args=-Wl,--disable-new-dtags,-rpath,\$ORIGIN/../lib"
+else
+    export RUSTFLAGS="${RUSTFLAGS:-} -C link-args=-Wl,--disable-new-dtags,-rpath,\$ORIGIN/../lib"
+fi
 cargo build --release --target "${target_triple}" --package zed --package cli
 # Build remote_server in separate invocation to prevent feature unification from other crates
 # from influencing dynamic libraries required by it.
@@ -111,10 +119,12 @@ else
     fi
 fi
 
-# Strip debug symbols and save them for upload to DigitalOcean
-objcopy --strip-debug "${target_dir}/${target_triple}/release/zed"
-objcopy --strip-debug "${target_dir}/${target_triple}/release/cli"
-objcopy --strip-debug "${target_dir}/${remote_server_triple}/release/remote_server"
+# Strip debug symbols and save them for upload to DigitalOcean.
+# We use llvm-objcopy because GNU objcopy on older distros (e.g. Ubuntu 20.04)
+# doesn't understand CREL sections produced by newer LLVM.
+llvm-objcopy --strip-debug "${target_dir}/${target_triple}/release/zed"
+llvm-objcopy --strip-debug "${target_dir}/${target_triple}/release/cli"
+llvm-objcopy --strip-debug "${target_dir}/${remote_server_triple}/release/remote_server"
 
 # Ensure that remote_server does not depend on libssl nor libcrypto, as we got rid of these deps.
 if ldd "${target_dir}/${remote_server_triple}/release/remote_server" | grep -q 'libcrypto\|libssl'; then

script/linux

@@ -39,6 +39,8 @@ if [[ -n $apt ]]; then
     make
     cmake
     clang
+    lld
+    llvm
     jq
     git
     curl

tooling/xtask/src/tasks/workflows/steps.rs

@@ -262,18 +262,12 @@ pub fn setup_linux() -> Step<Run> {
     named::bash("./script/linux")
 }
 
-fn install_mold() -> Step<Run> {
-    named::bash("./script/install-mold")
-}
-
 fn download_wasi_sdk() -> Step<Run> {
     named::bash("./script/download-wasi-sdk")
 }
 
 pub(crate) fn install_linux_dependencies(job: Job) -> Job {
-    job.add_step(setup_linux())
-        .add_step(install_mold())
-        .add_step(download_wasi_sdk())
+    job.add_step(setup_linux()).add_step(download_wasi_sdk())
 }
 
 pub fn script(name: &str) -> Step<Run> {