macOS Tiger platform and instructions

CMake/Platforms.cmake

@@ -88,4 +88,16 @@ if(CMAKE_SYSTEM_NAME MATCHES "Darwin")
   # to detect available APIs.
   string(REGEX REPLACE "^([0-9]+)\\.([0-9]+).*$" "\\1" DARWIN_MAJOR_VERSION "${CMAKE_SYSTEM_VERSION}")
   string(REGEX REPLACE "^([0-9]+)\\.([0-9]+).*$" "\\2" DARWIN_MINOR_VERSION "${CMAKE_SYSTEM_VERSION}")
+
+  if(DARWIN_MAJOR_VERSION VERSION_EQUAL 8)
+    include(platforms/macos_tiger)
+  endif()
+
+  # For older macOS, we assume MacPorts because Homebrew only supports newer version
+  if(DARWIN_MAJOR_VERSION VERSION_LESS 11)
+    list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/platforms/macports/finders")
+
+    # On MacPorts, libfmt is in a subdirectory:
+    list(APPEND CMAKE_MODULE_PATH "/opt/local/lib/libfmt11/cmake")
+  endif()
 endif()

CMake/platforms/macos_tiger.cmake

@@ -0,0 +1,20 @@
+# ASAN and UBSAN are not supported by macports gcc14 on PowerPC.
+set(ASAN OFF)
+set(UBSAN OFF)
+
+# SDL2 does not build for Tiger, so we use SDL1 instead.
+set(USE_SDL1 ON)
+
+# ZeroTier is yet to be tested.
+set(DISABLE_ZERO_TIER ON)
+
+# Use vendored libfmt until this issue is resolved:
+# https://trac.macports.org/ticket/71503
+set(DEVILUTIONX_SYSTEM_LIBFMT OFF)
+set(DEVILUTIONX_STATIC_LIBFMT ON)
+
+# https://trac.macports.org/ticket/71511
+set(DEVILUTIONX_SYSTEM_GOOGLETEST OFF)
+set(DEVILUTIONX_STATIC_GOOGLETEST OFF)
+set(DEVILUTIONX_SYSTEM_BENCHMARK OFF)
+set(DEVILUTIONX_STATIC_BENCHMARK OFF)

docs/building.md

@@ -528,6 +528,49 @@ Executing `Packaging/miyoo_mini/build.sh` will create the folder `build-miyoo-mi
 OnionOS Port Collection.
 </details>
 
+<details><summary>macOS 10.4 Tiger</summary>
+
+For macOS Tiger, DevilutionX can be compiled using the compiler and libraries from [MacPorts](https://www.macports.org/).
+
+For PowerPC, you can use precompiled dependencies from here:
+
+http://macports-tiger-ppc.glebm.com/
+
+After installing MacPorts, run:
+
+~~~ bash
+# Some packages may require you to manually deactivate certain ports during installation.
+# Remember to reactivate them after installing.
+sudo port install curl curl-ca-bundle gcc14 cmake \
+  libsdl12 libsdl_image libsodium bzip2 zlib
+
+# Set GCC 14 as the default GCC:
+sudo port select --set gcc mp-gcc14
+~~~
+
+<!-- The following packages have issues so we use the vendored versions:
+     libfmt11 google-benchmark gtest -->
+
+Then, build DevilutionX:
+
+~~~ bash
+CC=gcc cmake -S. -Bbuild-rel -DCMAKE_BUILD_TYPE=Release -DBUILD_TESTING=OFF -DCPACK=ON -DMACOSX_STANDALONE_APP_BUNDLE=ON
+cmake --build build-rel -j "$(sysctl -n hw.ncpu)"
+
+# `sudo` is required to produce a bundle with all the shared libraries.
+sudo cmake --build build-rel --target package -j "$(sysctl -n hw.ncpu)"
+~~~
+
+To run tools from the `tools/` directory (only needed for development), you also need Python:
+
+~~~ bash
+sudo port install python312
+sudo port select --set python python312
+sudo port select --set python3 python312
+~~~
+
+</details>
+
 <details><summary><b>CMake build options</b></summary>
 
 ### General