CI: Bundle arm64 libraries with Windows multilib package

Author: kinke

.github/actions/merge-windows/action.yml

@@ -63,6 +63,45 @@ runs:
         set PATH=%CD%\ldc2-multilib\lib32;%PATH%
         ldc2-multilib\bin\ldc2 -link-defaultlib-shared -m32 -run hello.d || exit /b
 
+    # preliminary arm64 cross-compilation support
+    - name: Install ninja v1.12.1
+      uses: Ahajha/gha-setup-ninja@69595b0cf872acdad8ce599142fbdc88724b9a2b
+    - name: 'Set VSDIR env variable'
+      shell: bash
+      run: echo "VSDIR=$(vswhere -latest -property installationPath)" >> $GITHUB_ENV
+    - name: Cross-compile arm64 libraries
+      shell: cmd
+      run: |
+        echo on
+        call "%VSDIR%\Common7\Tools\VsDevCmd.bat" -arch=arm64 -host_arch=x64 || exit /b
+        echo on
+        ldc2-multilib\bin\ldc-build-runtime --ninja ^
+          --buildDir=build-libs-arm64 ^
+          --dFlags=-mtriple=aarch64-windows-msvc ^
+          "--ldcSrcDir=%CD%" ^
+          BUILD_LTO_LIBS=ON
+    - name: Copy arm64 libraries
+      shell: bash
+      run: cp -R build-libs-arm64/lib ldc2-multilib/libarm64
+    - name: Add arm64 section to ldc2.conf
+      shell: pwsh
+      run: |
+        cd ldc2-multilib
+        $conf64 = cat etc\ldc2.conf -Raw
+        $conf64 = "`r`n""(aarch|arm)64-.*-windows-msvc"":" + $conf64.Substring($conf64.IndexOf("`r`ndefault:") + 10)
+        $conf64 = $conf64.Substring(0, $conf64.IndexOf("`r`n};`r`n") + 6)
+        $conf64 = $conf64.Replace('%%ldcbinarypath%%/../lib64', '%%ldcbinarypath%%/../libarm64')
+        Add-Content etc\ldc2.conf $conf64
+        cat etc\ldc2.conf
+    - name: Run arm64 hello-world cross-compilation smoke tests
+      shell: cmd
+      run: |
+        echo on
+        call "%VSDIR%\Common7\Tools\VsDevCmd.bat" -arch=arm64 -host_arch=x64 || exit /b
+        echo on
+        ldc2-multilib\bin\ldc2 -mtriple=aarch64-windows-msvc hello.d || exit /b
+        ldc2-multilib\bin\ldc2 -mtriple=aarch64-windows-msvc -link-defaultlib-shared hello.d || exit /b
+
     - name: Pack multilib package
       shell: bash
       run: |

packaging/windows_installer.iss

@@ -29,14 +29,16 @@ SolidCompression=yes
 Name: "english"; MessagesFile: "compiler:Default.isl"
 
 [Files]
-Source: "{#LDCDir}\*"; Excludes: "\lib32,\lib64"; DestDir: "{app}"; Components: core; Flags: ignoreversion recursesubdirs
+Source: "{#LDCDir}\*"; Excludes: "\lib32,\lib64,\libarm64"; DestDir: "{app}"; Components: core; Flags: ignoreversion recursesubdirs
 Source: "{#LDCDir}\lib64\*"; DestDir: "{app}\lib64"; Components: lib64; Flags: ignoreversion recursesubdirs
 Source: "{#LDCDir}\lib32\*"; DestDir: "{app}\lib32"; Components: lib32; Flags: ignoreversion recursesubdirs
+Source: "{#LDCDir}\libarm64\*"; DestDir: "{app}\libarm64"; Components: libarm64; Flags: ignoreversion recursesubdirs
 
 [Components]
 Name: core; Description: "Executables, config file and imports"; Types: full compact custom; Flags: fixed
 Name: lib64; Description: "x64 libraries"; Types: full compact
 Name: lib32; Description: "x86 libraries"; Types: full
+Name: libarm64; Description: "arm64 libraries"; Types: full
 
 [Run]
 ; note: not added to PATH for silent installs with /SILENT or /VERYSILENT