Test both rtools

Author: andrjohns

.github/workflows/main.yml

@@ -26,7 +26,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [windows-11-arm, ubuntu-24.04-arm]
+        os: [windows-11-arm, windows-latest, ubuntu-24.04-arm]
         config: [
           { label: misc, tests: 'test/unit/*_test.cpp test/unit/math/*_test.cpp test/unit/math/memory' },
           { label: prim, tests: 'test/unit/math/prim' },
@@ -44,9 +44,11 @@ jobs:
     - name: Download and install Rtools45
       if: runner.os == 'Windows'
       run: |
-        Invoke-WebRequest -Uri https://github.com/r-hub/rtools45/releases/download/latest/rtools45-aarch64.exe -OutFile rtools45-aarch64.exe
-        Start-Process -FilePath rtools45-aarch64.exe -ArgumentList "/install /norestart /verysilent /SUPPRESSMSGBOXES" -NoNewWindow -Wait
-        echo "C:/rtools45-aarch64/usr/bin;C:/rtools45-aarch64/aarch64-w64-mingw32.static.posix/bin" | Out-File -Append -FilePath $env:GITHUB_PATH -Encoding utf8
+        $ARCH = if (${{ matrix.os }} == 'windows-11-arm') { 'aarch64' } else { 'x86_64' }
+        $RTOOLS = if (${{ matrix.os }} == 'windows-11-arm') { 'rtools45-$ARCH' } else { 'rtools45' }
+        Invoke-WebRequest -Uri https://github.com/r-hub/rtools45/releases/download/latest/$RTOOLS.exe -OutFile $RTOOLS.exe
+        Start-Process -FilePath $RTOOLS.exe -ArgumentList "/install /norestart /verysilent /SUPPRESSMSGBOXES" -NoNewWindow -Wait
+        echo "C:/$RTOOLS/usr/bin;C:/$RTOOLS/$ARCH-w64-mingw32.static.posix/bin" | Out-File -Append -FilePath $env:GITHUB_PATH -Encoding utf8
 
     - name: Build Math libs
       shell: pwsh
@@ -78,7 +80,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [windows-11-arm, ubuntu-24.04-arm]
+        os: [windows-11-arm, windows-latest, ubuntu-24.04-arm]
         group: [1, 2, 3, 4, 5]
 
     steps:
@@ -90,9 +92,11 @@ jobs:
     - name: Download and install Rtools45
       if: runner.os == 'Windows'
       run: |
-        Invoke-WebRequest -Uri https://github.com/r-hub/rtools45/releases/download/latest/rtools45-aarch64.exe -OutFile rtools45-aarch64.exe
-        Start-Process -FilePath rtools45-aarch64.exe -ArgumentList "/install /norestart /verysilent /SUPPRESSMSGBOXES" -NoNewWindow -Wait
-        echo "C:/rtools45-aarch64/usr/bin;C:/rtools45-aarch64/aarch64-w64-mingw32.static.posix/bin" | Out-File -Append -FilePath $env:GITHUB_PATH -Encoding utf8
+        $ARCH = if (${{ matrix.os }} == 'windows-11-arm') { 'aarch64' } else { 'x86_64' }
+        $RTOOLS = if (${{ matrix.os }} == 'windows-11-arm') { 'rtools45-$ARCH' } else { 'rtools45' }
+        Invoke-WebRequest -Uri https://github.com/r-hub/rtools45/releases/download/latest/$RTOOLS.exe -OutFile $RTOOLS.exe
+        Start-Process -FilePath $RTOOLS.exe -ArgumentList "/install /norestart /verysilent /SUPPRESSMSGBOXES" -NoNewWindow -Wait
+        echo "C:/$RTOOLS/usr/bin;C:/$RTOOLS/$ARCH-w64-mingw32.static.posix/bin" | Out-File -Append -FilePath $env:GITHUB_PATH -Encoding utf8
 
     - name: Build Math libs
       shell: pwsh