Add preliminary support for Xcode and building universal dylib

Author: cboulay

.github/workflows/cppcmake.yml

@@ -39,18 +39,26 @@ jobs:
         - {name: "ubuntu-24.04", os: "ubuntu-24.04",   cmake_extra: "-DLSL_BUNDLED_PUGIXML=OFF" }
         - {name: "windows-x64",  os: "windows-latest", cmake_extra: "-T v142,host=x86"}
         - {name: "windows-32",   os: "windows-latest", cmake_extra: "-T v142,host=x86 -A Win32"}
-        - {name: "macOS-latest", os: "macOS-latest"}
+        - {name: "macOS-latest", os: "macOS-latest", cmake_extra: "-DCMAKE_OSX_DEPLOYMENT_TARGET=10.15 -DCMAKE_OSX_ARCHITECTURES=x86_64;arm64 DCMAKE_SYSTEM_NAME=Darwin -G Xcode" }
 
     # runs all steps in the container configured in config.docker or as subprocesses when empty
     container: ${{ matrix.config.docker }}
     steps:
     - uses: actions/checkout@v4
+
     - name: set up build environment in container
+      if: ${{ matrix.config.docker }}
       run: |
          set -x
          apt update
          apt install -y --no-install-recommends g++ git ninja-build file dpkg-dev lsb-release sudo curl cmake libpugixml-dev
-      if: ${{ matrix.config.docker }}
+
+    - name: Setup Xcode
+      if: ${{ matrix.config.name == 'macOS-latest' }}
+      uses: maxim-lobanov/setup-xcode@v1
+      with:
+        xcode-version: 'latest-stable'
+
     - name: Configure CMake
       run: |
            if [[ "${{ matrix.config.name }}" = ubuntu-2* ]]; then
@@ -68,8 +76,12 @@ jobs:
                 ${{ matrix.config.cmake_extra }} \
                 ${{ github.event.inputs.cmakeextra }}
             echo ${PWD}
+
     - name: make
-      run: cmake --build build --target install --config Release -j
+      run: cmake --build build --config Release -j
+
+    - name: make install
+      run: cmake --build build --config Release --target install
 
     - name: test install using examples
       run: |
@@ -101,6 +113,7 @@ jobs:
            fi
            cmake -E remove_directory package/_CPack_Packages
            cp testing/lslcfgs/default.cfg .
+
     - name: upload install dir
       uses: actions/upload-artifact@master
       with:
@@ -112,6 +125,7 @@ jobs:
       with:
         name: pkg-${{ matrix.config.name }}
         path: package
+
     - name: print network config
       run: |
            which ifconfig && ifconfig
@@ -133,12 +147,14 @@ jobs:
         install/bin/lsl_test_internal --order rand --wait-for-keypress never --durations yes || test ! -z "${{ matrix.config.docker }}"
         install/bin/lsl_test_exported --order rand --wait-for-keypress never --durations yes
       timeout-minutes: 10
+
     - name: upload dump
       if: failure()
       uses: actions/upload-artifact@master
       with:
         name: dumps-${{ matrix.config.name }}
         path: dumps
+
     - name: upload to release page
       if: github.event_name == 'release'
       env:

cmake/TargetLib.cmake

@@ -47,3 +47,23 @@ target_compile_definitions(lsl
         # don't use #pragma(lib) in MSVC builds. TODO: Maybe this can be inherited from lslobj or removed on lslobj?
         $<$<CXX_COMPILER_ID:MSVC>:LSLNOAUTOLINK>
 )
+
+# Extra configuration for Apple targets -- set xcode attributes
+if(APPLE)
+    set_target_properties(lsl PROPERTIES
+            XCODE_ATTRIBUTE_PRODUCT_BUNDLE_IDENTIFIER "org.labstreaminglayer.liblsl"
+    )
+    # If environment variables are set for Apple Development Team and Code Sign Identity then add these to the target
+    # -> if `-G Xcode` generator is used then Xcode will use these variables to sign the framework.
+    # Note, however, that it is likely that the build products will be modified post-build, invalidating the signature,
+    #  so post-hoc signing will be required. Nevertheless, this is useful for initial signing and normal Xcode workflow.
+    if(DEFINED ENV{APPLE_DEVELOPMENT_TEAM} AND DEFINED ENV{APPLE_CODE_SIGN_IDENTITY_APP})
+        set_target_properties(lsl PROPERTIES
+                XCODE_ATTRIBUTE_CODE_SIGN_IDENTITY $ENV{APPLE_CODE_SIGN_IDENTITY_APP}
+                XCODE_ATTRIBUTE_DEVELOPMENT_TEAM $ENV{APPLE_DEVELOPMENT_TEAM}
+                XCODE_ATTRIBUTE_CODE_SIGN_STYLE "Manual"
+                XCODE_ATTRIBUTE_DEPLOYMENT_POSTPROCESSING YES   # this is needed for strip symbols
+                XCODE_ATTRIBUTE_OTHER_CODE_SIGN_FLAGS "--deep"
+        )
+    endif()
+endif(APPLE)