Fix macOS CMake SDL linking (#584)

* Ignore cmake intermediate build dir

* Fix C++ language version in cmake build scripts

* Set a default SDL2_ROOT_DIR value for macOS in cmake scripts

* Fixed macOS SDL framework linking in cmake scripts

* Added macos-cmake target for CI builds in github workflows

* Use C++17 for building Tests instead of 20, since we build them with VS2019 in some jobs

.github/workflows/Build.yaml

@@ -46,6 +46,33 @@ jobs:
       working-directory: RecastDemo/Build/xcode4/
       run: xcodebuild -scheme Tests -configuration ${{matrix.conf}} -project Tests.xcodeproj build
   
+  macos-cmake:
+    strategy:
+      matrix:
+        conf:
+          - Debug
+          - Release
+
+    runs-on: macos-latest
+    
+    steps:
+    - uses: actions/checkout@v3
+    - name: Download & install SDL
+      run: |
+        curl -L -o SDL2.dmg https://github.com/libsdl-org/SDL/releases/download/release-2.24.2/SDL2-2.24.2.dmg
+        hdiutil attach SDL2.dmg
+        cp -r /Volumes/SDL2/SDL2.framework ${{github.workspace}}/RecastDemo/Bin/
+        hdiutil detach /Volumes/SDL2
+        rm SDL2.dmg
+
+    - name: Configure CMake
+      # Configure CMake in a 'build' subdirectory. `CMAKE_BUILD_TYPE` is only required if you are using a single-configuration generator such as make.
+      # See https://cmake.org/cmake/help/latest/variable/CMAKE_BUILD_TYPE.html?highlight=cmake_build_type
+      run: cmake -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{matrix.conf}} -DSDL2_LIBRARY=${{github.workspace}}/RecastDemo/Bin/SDL2.framework
+
+    - name: Build
+      run: cmake --build ${{github.workspace}}/build --config ${{matrix.conf}}
+  
   linux-premake:
     strategy:
       matrix:

.gitignore

@@ -47,6 +47,9 @@ RecastDemo/Contrib/SDL/*
 ## Generated doc files
 Docs/html
 
+## CMake build cache
+build
+
 ## IDE files
 .idea/
 cmake-build-*/

CMakeLists.txt

@@ -7,6 +7,8 @@ SET(SOVERSION 1)
 set(LIB_VERSION 1.5.1)
 string(REPLACE "." "," LIB_VERSION_NUM "${LIB_VERSION}.0")
 
+set_property(GLOBAL PROPERTY CXX_STANDARD 98)
+
 option(RECASTNAVIGATION_DEMO "Build demo" ON)
 option(RECASTNAVIGATION_TESTS "Build tests" ON)
 option(RECASTNAVIGATION_EXAMPLES "Build examples" ON)

RecastDemo/CMakeLists.txt

@@ -3,11 +3,22 @@ file(GLOB SOURCES Source/*.cpp Contrib/fastlz/fastlz.c)
 list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake)
 
 if(NOT SDL2_ROOT_DIR)
+  if(WIN32)
     set(SDL2_ROOT_DIR "${CMAKE_CURRENT_SOURCE_DIR}/Contrib/SDL")
+  elseif(APPLE)
+    set(SDL2_ROOT_DIR "${CMAKE_CURRENT_SOURCE_DIR}/Bin")
+  endif()
 endif()
 
 find_package(OpenGL REQUIRED)
+if(APPLE)
+  find_library(SDL2_LIBRARY 
+    NAMES SDL2
+    PATHS ${SDL2_ROOT_DIR}
+    REQUIRED)
+else()
   find_package(SDL2 REQUIRED)
+endif()
 
 include_directories(SYSTEM ${OPENGL_INCLUDE_DIR})
 include_directories(SYSTEM Contrib/fastlz)
@@ -19,6 +30,9 @@ include_directories(../DetourTileCache/Include)
 include_directories(../Recast/Include)
 include_directories(Include)
 include_directories(Contrib/SDL/include)
+if(APPLE)
+  include_directories(${SDL2_LIBRARY}/Headers)
+endif()
 
 if (WIN32)
     add_executable(RecastDemo WIN32 ${SOURCES})
@@ -54,7 +68,12 @@ endif()
 
 
 add_dependencies(RecastDemo DebugUtils Detour DetourCrowd DetourTileCache Recast)
+if(APPLE)
+  target_link_libraries(RecastDemo ${OPENGL_LIBRARIES} ${SDL2_LIBRARY} DebugUtils Detour DetourCrowd DetourTileCache Recast)
+else()
   target_link_libraries(RecastDemo ${OPENGL_LIBRARIES} SDL2::SDL2main DebugUtils Detour DetourCrowd DetourTileCache Recast)
+endif()
+
 
 install(TARGETS RecastDemo
         RUNTIME DESTINATION bin

Tests/CMakeLists.txt

@@ -6,6 +6,9 @@ include_directories(./Contrib/Catch)
 include_directories(${CMAKE_CURRENT_SOURCE_DIR})
 
 add_executable(Tests ${TESTS_SOURCES})
+
+set_property(TARGET Tests PROPERTY CXX_STANDARD 17)
+
 add_dependencies(Tests Recast Detour)
 target_link_libraries(Tests Recast Detour)
 add_test(Tests Tests)