From cfaf1bebfe09d38ed93bc7e9b5c6c7319aae11a4 Mon Sep 17 00:00:00 2001
From: PsychoTodd <toddzhang1@gmail.com>
Date: Fri, 1 May 2020 20:44:58 -0700
Subject: [PATCH] add toolchain files for ios simulator.

---
 BUILDING.md                           | 26 ++++++++++++++++++++++++++
 cmake/toolchains/arm-ios-common.cmake |  6 +++++-
 cmake/toolchains/i386-ios.cmake       | 15 +++++++++++++++
 cmake/toolchains/x86_64-ios.cmake     | 15 +++++++++++++++
 4 files changed, 61 insertions(+), 1 deletion(-)
 create mode 100644 cmake/toolchains/i386-ios.cmake
 create mode 100644 cmake/toolchains/x86_64-ios.cmake

diff --git a/BUILDING.md b/BUILDING.md
index 26b3f40..2eb0da2 100644
--- a/BUILDING.md
+++ b/BUILDING.md
@@ -197,6 +197,32 @@ $ cmake ../ -DCMAKE_TOOLCHAIN_FILE=/path/to/Emscripten.cmake
 $ make
 ~~~~~
 
+iOS Builds
+---------------------
+To build Draco for different iOS architectures and simulators for iphone and the simulators
+
+~~~~~ bash
+
+#arm64
+$ cmake ../ -DCMAKE_TOOLCHAIN_FILE=../cmake/toolchains/arm64-ios.cmake
+$ make
+
+#x86_64
+$ cmake ../ -DCMAKE_TOOLCHAIN_FILE=../cmake/toolchains/x86_64-ios.cmake
+$ make
+
+#armv7
+$ cmake ../ -DCMAKE_TOOLCHAIN_FILE=../cmake/toolchains/armv7-ios.cmake
+$ make
+
+#i386
+$ cmake ../ -DCMAKE_TOOLCHAIN_FILE=../cmake/toolchains/i386-ios.cmake
+$ make
+~~~~~~
+
+After building the tools they can be merged into fat lib and used in Iphone applications.
+
+
 Native Android Builds
 ---------------------
 
diff --git a/cmake/toolchains/arm-ios-common.cmake b/cmake/toolchains/arm-ios-common.cmake
index b43f04b..65326d1 100644
--- a/cmake/toolchains/arm-ios-common.cmake
+++ b/cmake/toolchains/arm-ios-common.cmake
@@ -4,7 +4,11 @@ endif()
 set(DRACO_CMAKE_ARM_IOS_COMMON_CMAKE_ 1)
 
 set(CMAKE_SYSTEM_NAME "Darwin")
-set(CMAKE_OSX_SYSROOT iphoneos)
+if(CMAKE_OSX_SDK)
+  set(CMAKE_OSX_SYSROOT ${CMAKE_OSX_SDK})
+else()
+  set(CMAKE_OSX_SYSROOT iphoneos)
+endif()
 set(CMAKE_C_COMPILER clang)
 set(CMAKE_C_COMPILER_ARG1 "-arch ${CMAKE_SYSTEM_PROCESSOR}")
 set(CMAKE_CXX_COMPILER clang++)
diff --git a/cmake/toolchains/i386-ios.cmake b/cmake/toolchains/i386-ios.cmake
new file mode 100644
index 0000000..e9a1055
--- /dev/null
+++ b/cmake/toolchains/i386-ios.cmake
@@ -0,0 +1,15 @@
+if(DRACO_CMAKE_TOOLCHAINS_i386_IOS_CMAKE_)
+  return()
+endif()
+set(DRACO_CMAKE_TOOLCHAINS_i386_IOS_CMAKE_ 1)
+
+if(XCODE)
+  # TODO(tomfinegan): Handle arm builds in Xcode.
+  message(FATAL_ERROR "This toolchain does not support Xcode.")
+endif()
+
+set(CMAKE_SYSTEM_PROCESSOR "i386")
+set(CMAKE_OSX_ARCHITECTURES "i386")
+set(CMAKE_OSX_SDK "iphonesimulator")
+
+include("${CMAKE_CURRENT_LIST_DIR}/arm-ios-common.cmake")
diff --git a/cmake/toolchains/x86_64-ios.cmake b/cmake/toolchains/x86_64-ios.cmake
new file mode 100644
index 0000000..4c50a72
--- /dev/null
+++ b/cmake/toolchains/x86_64-ios.cmake
@@ -0,0 +1,15 @@
+if(DRACO_CMAKE_TOOLCHAINS_X86_64_IOS_CMAKE_)
+  return()
+endif()
+set(DRACO_CMAKE_TOOLCHAINS_X86_64_IOS_CMAKE_ 1)
+
+if(XCODE)
+  # TODO(tomfinegan): Handle arm builds in Xcode.
+  message(FATAL_ERROR "This toolchain does not support Xcode.")
+endif()
+
+set(CMAKE_SYSTEM_PROCESSOR "x86_64")
+set(CMAKE_OSX_ARCHITECTURES "x86_64")
+set(CMAKE_OSX_SDK "iphonesimulator")
+
+include("${CMAKE_CURRENT_LIST_DIR}/arm-ios-common.cmake")