diff --git a/.github/workflows/test-linux.yml b/.github/workflows/test-linux.yml
index 5016b04c1b8..754ad92a024 100644
--- a/.github/workflows/test-linux.yml
+++ b/.github/workflows/test-linux.yml
@@ -11,6 +11,9 @@ on:
 jobs:
   build-linux:
     runs-on: ${{ matrix.os.id }}
+    env:
+      CC: ${{ matrix.compiler }}
+      CXXSTD: ${{ matrix.cpp_std }}
     strategy:
       matrix:
         os:
@@ -36,11 +39,8 @@ jobs:
           sudo apt-add-repository ppa:ubuntu-toolchain-r/test
           sudo apt-get update
           sudo apt-get install $CC $CXX
-          echo "CC=$CC" >> $GITHUB_ENV
           echo "CXX=$CXX" >> $GITHUB_ENV
           echo "CXXFLAGS=-Wp,-D_GLIBCXX_ASSERTIONS" >> $GITHUB_ENV
-        env:
-          CC: ${{ matrix.compiler }}
 
       - name: Setup Clang
         if: startsWith(matrix.compiler, 'clang')
@@ -53,18 +53,12 @@ jobs:
           sudo apt-get update
           CXX=${CC/#clang/clang++}
           sudo apt-get install $CC $CXX
-          echo "CC=$CC" >> $GITHUB_ENV
           echo "CXX=$CXX" >> $GITHUB_ENV
-        env:
-          CC: ${{ matrix.compiler }}
 
       - name: Runtime environment
         shell: bash
-        env:
-          WORKSPACE: ${{ github.workspace }}
         run: |
-          echo "GITHUB_WORKSPACE=`pwd`" >> $GITHUB_ENV
-          echo "$GITHUB_WORKSPACE/.local/bin" >> $GITHUB_PATH
+          echo "${{ github.workspace }}/.local/bin" >> $GITHUB_PATH
           echo "procs=$(nproc)" >> $GITHUB_ENV
 
       - name: Tool versions
@@ -82,7 +76,7 @@ jobs:
           mkdir build
           cd build
           make -f ../Makefile config-${CC%%-*}
-          make -f ../Makefile -j${{ env.procs }} CXXSTD=${{ matrix.cpp_std }} CC=$CC CXX=$CC LD=$CC
+          make -f ../Makefile -j$procs CXXSTD=$CXXSTD CC=$CC CXX=$CC LD=$CC
 
       - name: Compress build
         shell: bash
@@ -102,6 +96,8 @@ jobs:
     name: Run tests
     needs: build-linux
     runs-on: ${{ matrix.os.id }}
+    env:
+      CC: clang
     strategy:
       matrix:
         os:
@@ -124,16 +120,12 @@ jobs:
           sudo apt-get update
           CXX=${CC/#clang/clang++}
           sudo apt-get install $CC $CXX
-          echo "CC=$CC" >> $GITHUB_ENV
           echo "CXX=$CXX" >> $GITHUB_ENV
 
       - name: Runtime environment
         shell: bash
-        env:
-          WORKSPACE: ${{ github.workspace }}
         run: |
-          echo "GITHUB_WORKSPACE=`pwd`" >> $GITHUB_ENV
-          echo "$GITHUB_WORKSPACE/.local/bin" >> $GITHUB_PATH
+          echo "${{ github.workspace }}/.local/bin" >> $GITHUB_PATH
           echo "procs=$(nproc)" >> $GITHUB_ENV
 
       - name: Checkout Yosys
@@ -158,11 +150,11 @@ jobs:
         if: steps.cache-iverilog.outputs.cache-hit != 'true'
         shell: bash
         run: |
-          mkdir -p $GITHUB_WORKSPACE/.local/
+          mkdir -p ${{ github.workspace }}/.local/
           cd iverilog
           autoconf
-          CC=gcc CXX=g++ ./configure --prefix=$GITHUB_WORKSPACE/.local
-          make -j${{ env.procs }}
+          CC=gcc CXX=g++ ./configure --prefix=${{ github.workspace }}/.local
+          make -j$procs
           make install
 
       - name: Download build artifact