From fe730114224b05cab25f32607af69a80d7b660dd Mon Sep 17 00:00:00 2001
From: xiphon <xiphon@protonmail.com>
Date: Wed, 21 Oct 2020 16:19:26 +0000
Subject: [PATCH] cmake: Android cross compilation support

---
 CMakeLists.txt     | 37 ++++++++++++++++++++++++++++++++-----
 src/CMakeLists.txt | 27 +++++++++++++++++++--------
 2 files changed, 51 insertions(+), 13 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 197e7c30..c39e29c6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -149,9 +149,11 @@ message(STATUS "libusb: include dir at ${LibUSB_INCLUDE_DIRS}")
 message(STATUS "libusb: libraries at ${LibUSB_LIBRARIES}")
 
 # HIDApi
-find_package(HIDAPI REQUIRED)
-message(STATUS "libhidapi: include dir at ${HIDAPI_INCLUDE_DIRS}")
-message(STATUS "libhidapi: libraries at ${HIDAPI_LIBRARIES}")
+if(NOT ANDROID)
+  find_package(HIDAPI REQUIRED)
+  message(STATUS "libhidapi: include dir at ${HIDAPI_INCLUDE_DIRS}")
+  message(STATUS "libhidapi: libraries at ${HIDAPI_LIBRARIES}")
+endif()
 
 # Boost
 if(DEBUG)
@@ -174,7 +176,7 @@ find_package(Boost 1.58 REQUIRED COMPONENTS
 		program_options
 		locale)
 
-if(UNIX AND NOT APPLE)
+if(UNIX AND NOT APPLE AND NOT ANDROID)
     set(CMAKE_SKIP_RPATH ON)
     find_package(X11 REQUIRED)
     message(STATUS "X11_FOUND = ${X11_FOUND}")
@@ -253,7 +255,15 @@ foreach(QT5_MODULE ${QT5_LIBRARIES})
   include_directories(${${QT5_MODULE}_INCLUDE_DIRS})
 endforeach()
 
-pkg_check_modules(QT5_PKG_CONFIG REQUIRED ${QT5_LIBRARIES})
+if(NOT (CMAKE_CROSSCOMPILING AND ANDROID))
+  pkg_check_modules(QT5_PKG_CONFIG REQUIRED ${QT5_LIBRARIES})
+else()
+  set(QT5_LIBRARIES_ABI)
+  foreach(QT5_MODULE ${QT5_LIBRARIES})
+    list(APPEND QT5_LIBRARIES_ABI "${QT5_MODULE}_${CMAKE_ANDROID_ARCH_ABI}")
+  endforeach()
+  pkg_check_modules(QT5_PKG_CONFIG REQUIRED ${QT5_LIBRARIES_ABI})
+endif()
 
 if(QT5_PKG_CONFIG_FOUND)
   set(QT5_PKG_CONFIG "QT5_PKG_CONFIG")
@@ -376,6 +386,23 @@ if(STATIC)
   endif()
 endif()
 
+if(ANDROID)
+  set(QT5_EXTRA_LIBRARIES_LIST
+    GLESv2
+    log
+    z
+    jnigraphics
+    android
+    EGL
+    Qt5VirtualKeyboard_${CMAKE_ANDROID_ARCH_ABI}
+    c++_shared
+  )
+  foreach(LIBRARY ${QT5_EXTRA_LIBRARIES_LIST})
+    find_library(${LIBRARY}_LIBRARY ${LIBRARY} PATHS "${ANDROID_TOOLCHAIN_ROOT}/sysroot/usr/lib/${CMAKE_LIBRARY_ARCHITECTURE}/${ANDROID_PLATFORM_LEVEL}" REQUIRED)
+    list(APPEND QT5_LIBRARIES ${${LIBRARY}_LIBRARY})
+  endforeach()
+endif()
+
 message(STATUS "Using Boost include dir at ${Boost_INCLUDE_DIRS}")
 message(STATUS "Using Boost libraries at ${Boost_LIBRARIES}")
 
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index c7822ee7..003dfe73 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -81,13 +81,20 @@ if(APPLE)
     list(APPEND RESOURCES ${ICON})
 endif()
 
-add_executable(monero-wallet-gui ${EXECUTABLE_FLAG} main/main.cpp
+set(monero_wallet_gui_sources
     ${SOURCE_FILES}
     ${PASS_STRENGTH_FILES}
     ${QR_CODE_FILES}
     ${RESOURCES}
 )
 
+if(NOT ANDROID)
+    add_executable(monero-wallet-gui ${EXECUTABLE_FLAG} ${monero_wallet_gui_sources})
+else()
+    add_library(monero-wallet-gui SHARED ${monero_wallet_gui_sources})
+    set_target_properties(monero-wallet-gui PROPERTIES COMPILE_DEFINITIONS "ANDROID")
+endif()
+
 set_target_properties(monero-wallet-gui PROPERTIES
     RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin"
     MACOSX_BUNDLE TRUE
@@ -164,13 +171,17 @@ if(X11_FOUND)
 endif()
 
 if(WITH_SCANNER)
-    target_link_libraries(monero-wallet-gui
-        ${ZBAR_LIBRARIES}
-        jpeg
-        v4l2
-        v4lconvert
-        rt
-    )
+    if(NOT ANDROID)
+        target_link_libraries(monero-wallet-gui
+            ${ZBAR_LIBRARIES}
+            jpeg
+            v4l2
+            v4lconvert
+            rt
+        )
+    else()
+        target_link_libraries(monero-wallet-gui ${ZBAR_LIBRARIES})
+    endif()
 endif()
 
 add_custom_command(TARGET monero-wallet-gui POST_BUILD COMMAND ${CMAKE_COMMAND} -E copy $<TARGET_FILE:daemon> $<TARGET_FILE_DIR:monero-wallet-gui>)