diff --git a/.github/workflows/full_ci.yml b/.github/workflows/full_ci.yml
new file mode 100644
index 0000000000000..0357922a3d007
--- /dev/null
+++ b/.github/workflows/full_ci.yml
@@ -0,0 +1,348 @@
+name: full CI
+
+on:
+  merge_group:
+  push:
+    branches: ['main', 'libc-0.2']
+
+jobs:
+  docker_linux_tier1:
+    permissions:
+      actions: write # to cancel workflows (rust-lang/simpleinfra/github-actions/cancel-outdated-builds)
+      contents: read # to fetch code (actions/checkout)
+
+    name: Docker Linux Tier1
+    runs-on: ubuntu-22.04
+    strategy:
+      fail-fast: true
+      matrix:
+        target: [
+          i686-unknown-linux-gnu,
+          x86_64-unknown-linux-gnu,
+        ]
+    steps:
+      - uses: rust-lang/simpleinfra/github-actions/cancel-outdated-builds@HEAD
+        with:
+          github_token: "${{ secrets.GITHUB_TOKEN }}"
+      - uses: actions/checkout@v4
+      - name: Setup Rust toolchain
+        run: TARGET=${{ matrix.target }} sh ./ci/install-rust.sh
+      - name: Execute run-docker.sh
+        run: LIBC_CI=1 sh ./ci/run-docker.sh ${{ matrix.target }}
+
+  macos:
+    permissions:
+      actions: write # to cancel workflows (rust-lang/simpleinfra/github-actions/cancel-outdated-builds)
+      contents: read # to fetch code (actions/checkout)
+
+    name: macOS
+    runs-on: macos-13
+    strategy:
+      fail-fast: true
+      matrix:
+        target: [
+          x86_64-apple-darwin,
+        ]
+    steps:
+      - uses: rust-lang/simpleinfra/github-actions/cancel-outdated-builds@HEAD
+        with:
+          github_token: "${{ secrets.GITHUB_TOKEN }}"
+      - uses: actions/checkout@v4
+      - name: Setup Rust toolchain
+        run: TARGET=${{ matrix.target }} sh ./ci/install-rust.sh
+      - name: Execute run.sh
+        run: LIBC_CI=1 sh ./ci/run.sh ${{ matrix.target }}
+
+  windows:
+    permissions:
+      actions: write # to cancel workflows (rust-lang/simpleinfra/github-actions/cancel-outdated-builds)
+      contents: read # to fetch code (actions/checkout)
+
+    name: Windows
+    runs-on: windows-2022
+    env:
+      OS: windows
+    strategy:
+      fail-fast: true
+      matrix:
+        include:
+          - target: x86_64-pc-windows-gnu
+            env:
+              ARCH_BITS: 64
+              ARCH: x86_64
+          - target: x86_64-pc-windows-msvc
+          - target: i686-pc-windows-gnu
+            env:
+              ARCH_BITS: 32
+              ARCH: i686
+          - target: i686-pc-windows-msvc
+    steps:
+      - uses: rust-lang/simpleinfra/github-actions/cancel-outdated-builds@HEAD
+        with:
+          github_token: "${{ secrets.GITHUB_TOKEN }}"
+      - uses: actions/checkout@v4
+      - name: Self-update rustup
+        run: rustup self update
+        shell: bash
+      - name: Setup Rust toolchain
+        run: TARGET=${{ matrix.target }} sh ./ci/install-rust.sh
+        shell: bash
+      - name: Execute run.sh
+        run: LIBC_CI=1 sh ./ci/run.sh ${{ matrix.target }}
+        shell: bash
+
+  style_check:
+    permissions:
+      actions: write # to cancel workflows (rust-lang/simpleinfra/github-actions/cancel-outdated-builds)
+      contents: read # to fetch code (actions/checkout)
+
+    name: Style check
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: rust-lang/simpleinfra/github-actions/cancel-outdated-builds@HEAD
+        with:
+          github_token: "${{ secrets.GITHUB_TOKEN }}"
+      - uses: actions/checkout@v4
+      - name: Setup Rust toolchain
+        run: sh ./ci/install-rust.sh
+      - name: Check style
+        run: sh ci/style.sh
+
+  docker_linux_tier2:
+    permissions:
+      actions: write # to cancel workflows (rust-lang/simpleinfra/github-actions/cancel-outdated-builds)
+      contents: read # to fetch code (actions/checkout)
+
+    name: Docker Linux Tier2
+    needs: [docker_linux_tier1, style_check]
+    runs-on: ubuntu-22.04
+    strategy:
+      fail-fast: true
+      max-parallel: 12
+      matrix:
+        target: [
+          aarch64-linux-android,
+          aarch64-unknown-linux-gnu,
+          aarch64-unknown-linux-musl,
+          arm-linux-androideabi,
+          arm-unknown-linux-gnueabihf,
+          arm-unknown-linux-musleabihf,
+          i686-linux-android,
+          i686-unknown-linux-musl,
+          powerpc-unknown-linux-gnu,
+          powerpc64-unknown-linux-gnu,
+          powerpc64le-unknown-linux-gnu,
+          s390x-unknown-linux-gnu,
+          riscv64gc-unknown-linux-gnu,
+          # FIXME: A recent nightly causes a linker failure:
+          # /~https://github.com/rust-lang/rust/issues/76679
+          # See this comment for more details:
+          # /~https://github.com/rust-lang/libc/pull/2225#issuecomment-880696737
+          #wasm32-wasi,
+          sparc64-unknown-linux-gnu,
+          wasm32-unknown-emscripten,
+          x86_64-linux-android,
+          # FIXME: Exec format error (os error 8)
+          #x86_64-unknown-linux-gnux32,
+          x86_64-unknown-linux-musl,
+          # FIXME: It seems some items in `src/unix/mod.rs`
+          # aren't defined on redox actually.
+          # x86_64-unknown-redox,
+        ]
+    steps:
+      - uses: rust-lang/simpleinfra/github-actions/cancel-outdated-builds@HEAD
+        with:
+          github_token: "${{ secrets.GITHUB_TOKEN }}"
+      - uses: actions/checkout@v4
+      - name: Setup Rust toolchain
+        run: TARGET=${{ matrix.target }} sh ./ci/install-rust.sh
+      - name: Execute run-docker.sh
+        run: LIBC_CI=1 sh ./ci/run-docker.sh ${{ matrix.target }}
+
+  # These targets are tier 3 or otherwise need to have CI build std via -Zbuild-std.
+  # Because of this, only the nightly compiler can be used on these targets.
+  docker_linux_build_std:
+    permissions:
+      actions: write # to cancel workflows (rust-lang/simpleinfra/github-actions/cancel-outdated-builds)
+      contents: read # to fetch code (actions/checkout)
+
+    if: ${{ false }} # This is currently broken
+    name: Docker Linux Build-Std Targets
+    needs: [docker_linux_tier1, style_check]
+    runs-on: ubuntu-22.04
+    strategy:
+      fail-fast: true
+      max-parallel: 12
+      matrix:
+        target: [
+          armv7-unknown-linux-uclibceabihf
+        ]
+    steps:
+      - uses: rust-lang/simpleinfra/github-actions/cancel-outdated-builds@HEAD
+        with:
+          github_token: "${{ secrets.GITHUB_TOKEN }}"
+      - uses: actions/checkout@v4
+      - name: Setup Rust toolchain
+        run: TOOLCHAIN=nightly INSTALL_RUST_SRC=1 sh ./ci/install-rust.sh
+      - name: Execute run-docker.sh
+        run: LIBC_CI=1 TOOLCHAIN=nightly LIBC_CI_ZBUILD_STD=1 sh ./ci/run-docker.sh ${{ matrix.target }}
+
+  # devkitpro's pacman needs to be connected from Docker.
+  docker_switch:
+    permissions:
+      actions: write # to cancel workflows (rust-lang/simpleinfra/github-actions/cancel-outdated-builds)
+      contents: read # to fetch code (actions/checkout)
+
+    name: Docker Switch
+    needs: [docker_linux_tier1, style_check]
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: rust-lang/simpleinfra/github-actions/cancel-outdated-builds@HEAD
+        with:
+          github_token: "${{ secrets.GITHUB_TOKEN }}"
+      - uses: actions/checkout@v4
+      - name: Setup Rust toolchain
+        run: sh ./ci/install-rust.sh
+      - name: Execute run-docker.sh
+        run: LIBC_CI=1 sh ./ci/run-docker.sh switch
+
+  build_channels_linux:
+    permissions:
+      actions: write # to cancel workflows (rust-lang/simpleinfra/github-actions/cancel-outdated-builds)
+      contents: read # to fetch code (actions/checkout)
+
+    name: Build Channels Linux
+    needs: docker_linux_tier2
+    runs-on: ubuntu-22.04
+    env:
+      OS: linux
+    strategy:
+      fail-fast: true
+      max-parallel: 5
+      matrix:
+        toolchain: [
+          stable,
+          beta,
+          nightly,
+          # FIXME: Disabled due to:
+          # error: failed to parse registry's information for: serde
+          #1.13.0,
+          1.19.0,
+          1.24.0,
+          1.25.0,
+          1.30.0,
+        ]
+    steps:
+      - uses: rust-lang/simpleinfra/github-actions/cancel-outdated-builds@HEAD
+        with:
+          github_token: "${{ secrets.GITHUB_TOKEN }}"
+      - uses: actions/checkout@v4
+      - name: Setup Rust toolchain
+        run: TOOLCHAIN=${{ matrix.toolchain }} sh ./ci/install-rust.sh
+      - name: Execute build.sh
+        run: LIBC_CI=1 TOOLCHAIN=${{ matrix.toolchain }} sh ./ci/build.sh
+
+  build_channels_macos:
+    permissions:
+      contents: read # to fetch code (actions/checkout)
+
+    name: Build Channels macOS
+    needs: macos
+    env:
+      OS: macos
+    strategy:
+      fail-fast: true
+      max-parallel: 4
+      matrix:
+        target:
+          - { toolchain: stable, os: macos-13 }
+          - { toolchain: beta, os: macos-13 }
+          - { toolchain: nightly, os: macos-13 }
+          # Use macOS 11 for older toolchains as newer Xcode donesn't work well.
+          # FIXME: Disabled due to:
+          # error: failed to parse registry's information for: serde
+          #- { toolchain: 1.13.0, os: macos-11 }
+          - { toolchain: 1.19.0, os: macos-11 }
+          - { toolchain: 1.24.0, os: macos-11 }
+          - { toolchain: 1.25.0, os: macos-11 }
+          - { toolchain: 1.30.0, os: macos-11 }
+    runs-on: ${{ matrix.target.os }}
+    steps:
+      - uses: rust-lang/simpleinfra/github-actions/cancel-outdated-builds@HEAD
+        with:
+          github_token: "${{ secrets.GITHUB_TOKEN }}"
+      - uses: actions/checkout@v4
+      - name: Setup Rust toolchain
+        run: TOOLCHAIN=${{ matrix.target.toolchain }} sh ./ci/install-rust.sh
+      - name: Execute build.sh
+        run: LIBC_CI=1 TOOLCHAIN=${{ matrix.target.toolchain }} sh ./ci/build.sh
+
+  build_channels_windows:
+    permissions:
+      contents: read # to fetch code (actions/checkout)
+
+    name: Build Channels Windows
+    runs-on: windows-2022
+    env:
+      OS: windows
+    strategy:
+      fail-fast: true
+      matrix:
+        toolchain: [
+          1.19.0,
+          1.24.0,
+          1.25.0,
+          1.30.0,
+          stable,
+        ]
+    steps:
+      - uses: actions/checkout@v4
+      - name: Self-update rustup
+        run: rustup self update
+        shell: bash
+      - name: Execute build.sh
+        run: LIBC_CI=1 TOOLCHAIN=${{ matrix.toolchain }} sh ./ci/build.sh
+        shell: bash
+
+  check_cfg:
+    permissions:
+      actions: write # to cancel workflows (rust-lang/simpleinfra/github-actions/cancel-outdated-builds)
+      contents: read # to fetch code (actions/checkout)
+
+    name: "Check #[cfg]s"
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: rust-lang/simpleinfra/github-actions/cancel-outdated-builds@HEAD
+        with:
+          github_token: "${{ secrets.GITHUB_TOKEN }}"
+      - uses: actions/checkout@v4
+      - name: Setup Rust toolchain
+        run: TOOLCHAIN=nightly sh ./ci/install-rust.sh
+      - name: Build with check-cfg
+        run: LIBC_CI=1 LIBC_CHECK_CFG=1 cargo build -Z unstable-options -Z check-cfg
+
+  # One job that "summarizes" the success state of this pipeline. This can then be added to branch
+  # protection, rather than having to add each job separately.
+  success:
+    name: Success
+    runs-on: ubuntu-latest
+    needs: [
+      docker_linux_tier1,
+      docker_linux_tier2,
+      #docker_linux_build_std,
+      macos,
+      windows,
+      style_check,
+      docker_switch,
+      build_channels_linux,
+      build_channels_macos,
+      build_channels_windows,
+    ]
+    # Github branch protection is exceedingly silly and treats "jobs skipped because a dependency
+    # failed" as success. So we have to do some contortions to ensure the job fails if any of its
+    # dependencies fails.
+    if: always() # make sure this is never "skipped"
+    steps:
+      # Manually check the status of all dependencies. `if: failure()` does not work.
+      - name: check if any dependency failed
+        run: jq --exit-status 'all(.result == "success")' <<< '${{ toJson(needs) }}'