From 46c5b289862851aae2c78be3edae2b50d1a0bbfe Mon Sep 17 00:00:00 2001
From: Andy Green <andy@warmcat.com>
Date: Sun, 19 Jan 2020 08:17:20 +0000
Subject: [PATCH] cross: add cmake toolchain file aligned to android aarch64

https://github.com/warmcat/libwebsockets/issues/1830
---
 contrib/cross-aarch64-android.cmake | 48 +++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 contrib/cross-aarch64-android.cmake

diff --git a/contrib/cross-aarch64-android.cmake b/contrib/cross-aarch64-android.cmake
new file mode 100644
index 000000000..8ed84b1d6
--- /dev/null
+++ b/contrib/cross-aarch64-android.cmake
@@ -0,0 +1,48 @@
+#
+# CMake Toolchain file for crosscompiling Android / aarch64
+#
+# This can be used when running cmake in the following way:
+#  cd build/
+#  cmake .. -DCMAKE_TOOLCHAIN_FILE=../cross-aarch64-android.cmake
+#
+
+# Target operating system name.
+set(CMAKE_SYSTEM_NAME Linux)
+set(CMAKE_SYSTEM_PROCESSOR aarch64)
+
+# Name of C compiler.
+set(CMAKE_C_COMPILER "aarch64-linux-android-gcc")
+set(CMAKE_CXX_COMPILER "aarch64-linux-android-g++")
+
+#
+# Different build system distros set release optimization level to different
+# things according to their local policy, eg, Fedora is -O2 and Ubuntu is -O3
+# here.  Actually the build system's local policy is completely unrelated to
+# our desire for cross-build release optimization policy for code built to run
+# on a completely different target than the build system itself.
+#
+# Since this goes last on the compiler commandline we have to override it to a
+# sane value for cross-build here.  Notice some gcc versions enable broken
+# optimizations with -O3.
+#
+if (CMAKE_BUILD_TYPE MATCHES RELEASE OR CMAKE_BUILD_TYPE MATCHES Release OR CMAKE_BUILD_TYPE MATCHES release)
+	set(CMAKE_C_FLAGS_RELEASE ${CMAKE_C_FLAGS_RELEASE} -O2)
+	set(CMAKE_CXX_FLAGS_RELEASE ${CMAKE_CXX_FLAGS_RELEASE} -O2)
+endif()
+
+#-nostdlib
+SET(CMAKE_C_FLAGS "-DGCC_VER=\"\\\"$(GCC_VER)\\\"\" -DARM64=1 -D__LP64__=1 -Os -g3 -fpie -mstrict-align -fPIC -ffunction-sections -fdata-sections " CACHE STRING "" FORCE)
+
+
+# Where to look for the target environment. (More paths can be added here)
+#set(CMAKE_FIND_ROOT_PATH "")
+
+# Adjust the default behavior of the FIND_XXX() commands:
+# search programs in the host environment only.
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+
+# Search headers and libraries in the target environment only.
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+
+