Bug 1714004 - Add a tier 2 build using GCC 11. r=sylvestre,andi

Differential Revision: https://phabricator.services.mozilla.com/D116549

taskcluster/ci/build/linux.yml

@@ -89,6 +89,50 @@ linux64-plain/opt:
     optimization:
         skip-unless-expanded: null
 
+linux64-gcc/opt:
+    description: "Linux64 GCC Opt"
+    index:
+        product: firefox
+        job-name: linux64-gcc-opt
+    treeherder:
+        platform: linux64/opt
+        symbol: Bgcc
+        tier: 2
+    run-on-projects: ['mozilla-central']
+    worker-type: b-linux
+    worker:
+        max-run-time: 7200
+        env:
+            MOZ_LOW_PARALLELISM_BUILD: '1'
+            PERFHERDER_EXTRA_OPTIONS: gcc
+            FORCE_GCC: '1'
+    run:
+        using: mozharness
+        actions: [get-secrets, build]
+        config:
+            - builds/releng_base_firefox.py
+            - builds/releng_base_linux_64_builds.py
+        script: "mozharness/scripts/fx_desktop_build.py"
+        secrets: true
+        tooltool-downloads: public
+        need-xvfb: true
+    use-sccache: true
+    fetches:
+        toolchain:
+            - linux64-binutils
+            - linux64-clang
+            - linux64-gcc-11
+            - linux64-rust
+            - linux64-rust-size
+            - linux64-cbindgen
+            - linux64-dump-syms
+            - linux64-sccache
+            - linux64-nasm
+            - linux64-node
+            - linux64-lucetc
+            - linux64-sysroot
+            - wasi-sysroot
+
 linux64-plain-clang-trunk/opt:
     description: "Linux64 Opt Plain with clang trunk"
     index:

taskcluster/ci/fetch/toolchains.yml

@@ -86,6 +86,16 @@ gcc-9.3.0:
         strip-components: 1
         add-prefix: gcc-source/
 
+gcc-11.1.0:
+    description: GCC 11.1.0+ source code
+    fetch:
+        type: git
+        repo: https://gcc.gnu.org/git/gcc.git
+        # Tip of the releases/gcc-11 as of 2021-06-02.
+        revision: 22e424002217e182dee2fcc7d2df6d0fc601300d
+        artifact-name: gcc-source.tar.zst
+        path-prefix: gcc-source/
+
 gmp-5.1.3:
     description: GMP 5.1.3 source code
     fetch:

taskcluster/ci/toolchain/gcc.yml

@@ -61,6 +61,23 @@ linux64-gcc-9:
             - mpc-1.0.3
             - mpfr-3.1.4
 
+linux64-gcc-11:
+    description: "GCC 11 toolchain build"
+    treeherder:
+        symbol: TL(gcc11)
+    run:
+        script: build-gcc-linux.sh
+    fetches:
+        fetch:
+            - binutils-2.31.1
+            - gcc-11.1.0
+            - gmp-6.1.0
+            - isl-0.16.1
+            - mpc-1.0.3
+            - mpfr-3.1.4
+        toolchain:
+            - linux64-gcc-9
+
 linux64-gcc-sixgill:
     description: "sixgill GCC plugin build"
     treeherder:

taskcluster/scripts/misc/build-gcc-linux.sh

@@ -6,6 +6,8 @@ set -e
 root_dir=$MOZ_FETCHES_DIR
 data_dir=$GECKO_PATH/build/unix/build-gcc
 
+PATH=$MOZ_FETCHES_DIR/gcc/bin:$PATH
+
 . $data_dir/build-gcc.sh
 
 pushd $root_dir/gcc-source