Android build and export for the mono module

4 files changed, 173 insertions, 76 deletions

diff --git a/modules/mono/build_scripts/godotsharptools_build.py b/modules/mono/build_scripts/godotsharptools_build.py
index af3a5cb5c6..17f9a990af 100644
--- a/modules/mono/build_scripts/godotsharptools_build.py
+++ b/modules/mono/build_scripts/godotsharptools_build.py
@@ -1,6 +1,5 @@
 # Build GodotSharpTools solution
 
-
 import os
 
 from SCons.Script import Builder, Dir
@@ -53,21 +52,9 @@ def find_nuget_windows(env):
         if os.path.isfile(hint_path) and os.access(hint_path, os.X_OK):
             return hint_path
 
-    from . import mono_reg_utils as monoreg
-
-    mono_root = ''
-    bits = env['bits']
+    from . mono_reg_utils import find_mono_root_dir
 
-    if bits == '32':
-        if os.getenv('MONO32_PREFIX'):
-            mono_root = os.getenv('MONO32_PREFIX')
-        else:
-            mono_root = monoreg.find_mono_root_dir(bits)
-    else:
-        if os.getenv('MONO64_PREFIX'):
-            mono_root = os.getenv('MONO64_PREFIX')
-        else:
-            mono_root = monoreg.find_mono_root_dir(bits)
+    mono_root = env['mono_prefix'] or find_mono_root_dir(env['bits'])
 
     if mono_root:
         mono_bin_dir = os.path.join(mono_root, 'bin')
@@ -114,21 +101,9 @@ def find_msbuild_unix(filename):
 
 
 def find_msbuild_windows(env):
-    from . import mono_reg_utils as monoreg
+    from . mono_reg_utils import find_mono_root_dir, find_msbuild_tools_path_reg
 
-    mono_root = ''
-    bits = env['bits']
-
-    if bits == '32':
-        if os.getenv('MONO32_PREFIX'):
-            mono_root = os.getenv('MONO32_PREFIX')
-        else:
-            mono_root = monoreg.find_mono_root_dir(bits)
-    else:
-        if os.getenv('MONO64_PREFIX'):
-            mono_root = os.getenv('MONO64_PREFIX')
-        else:
-            mono_root = monoreg.find_mono_root_dir(bits)
+    mono_root = env['mono_prefix'] or find_mono_root_dir(env['bits'])
 
     if not mono_root:
         raise RuntimeError('Cannot find mono root directory')
@@ -148,7 +123,7 @@ def find_msbuild_windows(env):
         }
         return (msbuild_mono, framework_path, mono_msbuild_env)
 
-    msbuild_tools_path = monoreg.find_msbuild_tools_path_reg()
+    msbuild_tools_path = find_msbuild_tools_path_reg()
 
     if msbuild_tools_path:
         return (os.path.join(msbuild_tools_path, 'MSBuild.exe'), framework_path, {})
diff --git a/modules/mono/build_scripts/mono_configure.py b/modules/mono/build_scripts/mono_configure.py
index 4cfa2a5b93..2bce3ed376 100644
--- a/modules/mono/build_scripts/mono_configure.py
+++ b/modules/mono/build_scripts/mono_configure.py
@@ -1,15 +1,30 @@
 import imp
 import os
+import os.path
 import sys
 import subprocess
 
 from distutils.version import LooseVersion
-from SCons.Script import BoolVariable, Dir, Environment, Variables
+from SCons.Script import Dir, Environment
 
 if os.name == 'nt':
     from . import mono_reg_utils as monoreg
 
 
+android_arch_dirs = {
+    'armv7': 'armeabi-v7a',
+    'arm64v8': 'arm64-v8a',
+    'x86': 'x86',
+    'x86_64': 'x86_64'
+}
+
+
+def get_android_out_dir(env):
+    return os.path.join(Dir('#platform/android/java/libs').abspath,
+                        'release' if env['target'] == 'release' else 'debug',
+                        android_arch_dirs[env['android_arch']])
+
+
 def find_file_in_dir(directory, files, prefix='', extension=''):
     if not extension.startswith('.'):
         extension = '.' + extension
@@ -20,47 +35,55 @@ def find_file_in_dir(directory, files, prefix='', extension=''):
 
 
 def copy_file(src_dir, dst_dir, name):
-    from shutil import copyfile
+    from shutil import copy
 
-    src_path = os.path.join(src_dir, name)
-    dst_path = os.path.join(dst_dir, name)
+    src_path = os.path.join(Dir(src_dir).abspath, name)
+    dst_dir = Dir(dst_dir).abspath
 
     if not os.path.isdir(dst_dir):
         os.mkdir(dst_dir)
 
-    copyfile(src_path, dst_path)
+    copy(src_path, dst_dir)
 
 
 def configure(env, env_mono):
+    from SCons.Script import BoolVariable, PathVariable, Variables
+
     envvars = Variables()
+    envvars.Add(PathVariable('mono_prefix', 'Path to the mono installation directory for the target platform and architecture', '', PathVariable.PathAccept))
     envvars.Add(BoolVariable('mono_static', 'Statically link mono', False))
     envvars.Add(BoolVariable('copy_mono_root', 'Make a copy of the mono installation directory to bundle with the editor', False))
     envvars.Update(env)
 
     bits = env['bits']
+    is_android = env['platform'] == 'android'
 
     tools_enabled = env['tools']
     mono_static = env['mono_static']
     copy_mono_root = env['copy_mono_root']
 
+    mono_prefix = env['mono_prefix']
+
     mono_lib_names = ['mono-2.0-sgen', 'monosgen-2.0']
 
+    if is_android and not env['android_arch'] in android_arch_dirs:
+        raise RuntimeError('This module does not support for the specified \'android_arch\': ' + env['android_arch'])
+
+    if is_android and tools_enabled:
+        # TODO: Implement this. We have to add the data directory to the apk, concretely the Api and Tools folders.
+        raise RuntimeError('This module does not currently support building for android with tools enabled')
+
+    if (os.getenv('MONO32_PREFIX') or os.getenv('MONO64_PREFIX')) and not mono_prefix:
+        print("WARNING: The environment variables 'MONO32_PREFIX' and 'MONO64_PREFIX' are deprecated; use the 'mono_prefix' SCons parameter instead")
+
     if env['platform'] == 'windows':
-        mono_root = ''
+        mono_root = mono_prefix
 
-        if bits == '32':
-            if os.getenv('MONO32_PREFIX'):
-                mono_root = os.getenv('MONO32_PREFIX')
-            elif os.name == 'nt':
-                mono_root = monoreg.find_mono_root_dir(bits)
-        else:
-            if os.getenv('MONO64_PREFIX'):
-                mono_root = os.getenv('MONO64_PREFIX')
-            elif os.name == 'nt':
-                mono_root = monoreg.find_mono_root_dir(bits)
+        if not mono_root and os.name == 'nt':
+            mono_root = monoreg.find_mono_root_dir(bits)
 
         if not mono_root:
-            raise RuntimeError('Mono installation directory not found')
+            raise RuntimeError("Mono installation directory not found; specify one manually with the 'mono_prefix' SCons parameter")
 
         print('Found Mono root directory: ' + mono_root)
 
@@ -113,21 +136,18 @@ def configure(env, env_mono):
             if not mono_dll_name:
                 raise RuntimeError('Could not find mono shared library in: ' + mono_bin_path)
 
-            copy_file(mono_bin_path, 'bin', mono_dll_name + '.dll')
+            copy_file(mono_bin_path, '#bin', mono_dll_name + '.dll')
     else:
         is_apple = (sys.platform == 'darwin' or "osxcross" in env)
 
         sharedlib_ext = '.dylib' if is_apple else '.so'
 
-        mono_root = ''
+        mono_root = mono_prefix
         mono_lib_path = ''
+        mono_so_name = ''
 
-        if bits == '32':
-            if os.getenv('MONO32_PREFIX'):
-                mono_root = os.getenv('MONO32_PREFIX')
-        else:
-            if os.getenv('MONO64_PREFIX'):
-                mono_root = os.getenv('MONO64_PREFIX')
+        if not mono_root and is_android:
+            raise RuntimeError("Mono installation directory not found; specify one manually with the 'mono_prefix' SCons parameter")
 
         if not mono_root and is_apple:
             # Try with some known directories under OSX
@@ -142,7 +162,8 @@ def configure(env, env_mono):
         if not mono_root and mono_static:
             mono_root = pkgconfig_try_find_mono_root(mono_lib_names, sharedlib_ext)
             if not mono_root:
-                raise RuntimeError('Building with mono_static=yes, but failed to find the mono prefix with pkg-config. Specify one manually')
+                raise RuntimeError("Building with mono_static=yes, but failed to find the mono prefix with pkg-config; " + \
+                    "specify one manually with the 'mono_prefix' SCons parameter")
 
         if mono_root:
             print('Found Mono root directory: ' + mono_root)
@@ -174,6 +195,8 @@ def configure(env, env_mono):
 
             if is_apple:
                 env.Append(LIBS=['iconv', 'pthread'])
+            elif is_android:
+                env.Append(LIBS=['m', 'dl'])
             else:
                 env.Append(LIBS=['m', 'rt', 'dl', 'pthread'])
 
@@ -183,7 +206,7 @@ def configure(env, env_mono):
                 if not mono_so_name:
                     raise RuntimeError('Could not find mono shared library in: ' + mono_lib_path)
 
-                copy_file(mono_lib_path, 'bin', 'lib' + mono_so_name + sharedlib_ext)
+                copy_file(mono_lib_path, '#bin', 'lib' + mono_so_name + sharedlib_ext)
         else:
             assert not mono_static
 
@@ -196,9 +219,6 @@ def configure(env, env_mono):
             env.ParseConfig('pkg-config monosgen-2 --libs')
             env_mono.ParseConfig('pkg-config monosgen-2 --cflags')
 
-            mono_lib_path = ''
-            mono_so_name = ''
-
             tmpenv = Environment()
             tmpenv.AppendENVPath('PKG_CONFIG_PATH', os.getenv('PKG_CONFIG_PATH'))
             tmpenv.ParseConfig('pkg-config monosgen-2 --libs-only-L')
@@ -213,11 +233,13 @@ def configure(env, env_mono):
             if not mono_so_name:
                 raise RuntimeError('Could not find mono shared library in: ' + str(tmpenv['LIBPATH']))
 
-            copy_file(mono_lib_path, 'bin', 'lib' + mono_so_name + sharedlib_ext)
+        if not mono_static:
+            libs_output_dir = get_android_out_dir(env) if is_android else '#bin'
+            copy_file(mono_lib_path, libs_output_dir, 'lib' + mono_so_name + sharedlib_ext)
 
         env.Append(LINKFLAGS='-rdynamic')
 
-    if not tools_enabled:
+    if not tools_enabled and not is_android:
         if not mono_root:
             mono_root = subprocess.check_output(['pkg-config', 'mono-2', '--variable=prefix']).decode('utf8').strip()
 
@@ -241,7 +263,7 @@ def make_template_dir(env, mono_root):
 
     template_dir_name = ''
 
-    if platform in ['windows', 'osx', 'x11']:
+    if platform in ['windows', 'osx', 'x11', 'android']:
         template_dir_name = 'data.mono.%s.%s.%s' % (platform, env['bits'], target)
     else:
         assert False
@@ -256,12 +278,13 @@ def make_template_dir(env, mono_root):
 
     # Copy etc/mono/
 
-    template_mono_config_dir = os.path.join(template_mono_root_dir, 'etc', 'mono')
-    copy_mono_etc_dir(mono_root, template_mono_config_dir, env['platform'])
+    if platform != 'android':
+        template_mono_config_dir = os.path.join(template_mono_root_dir, 'etc', 'mono')
+        copy_mono_etc_dir(mono_root, template_mono_config_dir, env['platform'])
 
     # Copy the required shared libraries
 
-    copy_mono_shared_libs(mono_root, template_mono_root_dir, env['platform'])
+    copy_mono_shared_libs(env, mono_root, template_mono_root_dir)
 
 
 def copy_mono_root_files(env, mono_root):
@@ -285,7 +308,7 @@ def copy_mono_root_files(env, mono_root):
 
     # Copy the required shared libraries
 
-    copy_mono_shared_libs(mono_root, editor_mono_root_dir, env['platform'])
+    copy_mono_shared_libs(env, mono_root, editor_mono_root_dir)
 
     # Copy framework assemblies
 
@@ -332,39 +355,55 @@ def copy_mono_etc_dir(mono_root, target_mono_config_dir, platform):
     copy_tree(os.path.join(mono_etc_dir, '2.0'), os.path.join(target_mono_config_dir, '2.0'))
     copy_tree(os.path.join(mono_etc_dir, '4.0'), os.path.join(target_mono_config_dir, '4.0'))
     copy_tree(os.path.join(mono_etc_dir, '4.5'), os.path.join(target_mono_config_dir, '4.5'))
-    copy_tree(os.path.join(mono_etc_dir, 'mconfig'), os.path.join(target_mono_config_dir, 'mconfig'))
+    if os.path.isdir(os.path.join(mono_etc_dir, 'mconfig')):
+        copy_tree(os.path.join(mono_etc_dir, 'mconfig'), os.path.join(target_mono_config_dir, 'mconfig'))
 
     for file in glob(os.path.join(mono_etc_dir, '*')):
         if os.path.isfile(file):
             copy(file, target_mono_config_dir)
 
 
-def copy_mono_shared_libs(mono_root, target_mono_root_dir, platform):
+def copy_mono_shared_libs(env, mono_root, target_mono_root_dir):
     from shutil import copy
 
+    def copy_if_exists(src, dst):
+        if os.path.isfile(src):
+            copy(src, dst)
+
+    platform = env['platform']
+
     if platform == 'windows':
         target_mono_bin_dir = os.path.join(target_mono_root_dir, 'bin')
 
         if not os.path.isdir(target_mono_bin_dir):
             os.makedirs(target_mono_bin_dir)
 
-        copy(os.path.join(mono_root, 'bin', 'MonoPosixHelper.dll'), os.path.join(target_mono_bin_dir, 'MonoPosixHelper.dll'))
+        copy(os.path.join(mono_root, 'bin', 'MonoPosixHelper.dll'), target_mono_bin_dir)
     else:
-        target_mono_lib_dir = os.path.join(target_mono_root_dir, 'lib')
+        target_mono_lib_dir = get_android_out_dir(env) if platform == 'android' else os.path.join(target_mono_root_dir, 'lib')
 
         if not os.path.isdir(target_mono_lib_dir):
             os.makedirs(target_mono_lib_dir)
 
         if platform == 'osx':
-            copy(os.path.join(mono_root, 'lib', 'libMonoPosixHelper.dylib'), os.path.join(target_mono_lib_dir, 'libMonoPosixHelper.dylib'))
-        elif platform == 'x11':
-            copy(os.path.join(mono_root, 'lib', 'libmono-btls-shared.so'), os.path.join(target_mono_lib_dir, 'libmono-btls-shared.so'))
-            copy(os.path.join(mono_root, 'lib', 'libMonoPosixHelper.so'), os.path.join(target_mono_lib_dir, 'libMonoPosixHelper.so'))
+            # TODO: Make sure nothing is missing
+            copy(os.path.join(mono_root, 'lib', 'libMonoPosixHelper.dylib'), target_mono_lib_dir)
+        elif platform == 'x11' or platform == 'android':
+            lib_file_names = [lib_name + '.so' for lib_name in [
+                'libmono-btls-shared', 'libmono-ee-interp', 'libmono-native', 'libMonoPosixHelper',
+                'libmono-profiler-aot', 'libmono-profiler-coverage', 'libmono-profiler-log', 'libMonoSupportW'
+            ]]
+
+            for lib_file_name in lib_file_names:
+                copy_if_exists(os.path.join(mono_root, 'lib', lib_file_name), target_mono_lib_dir)
 
 
 def configure_for_mono_version(env, mono_version):
     if mono_version is None:
-        raise RuntimeError('Mono JIT compiler version not found')
+        if os.getenv('MONO_VERSION'):
+            mono_version = os.getenv('MONO_VERSION')
+        else:
+            raise RuntimeError("Mono JIT compiler version not found; specify one manually with the 'MONO_VERSION' environment variable")
     print('Found Mono JIT compiler version: ' + str(mono_version))
     if mono_version >= LooseVersion('5.12.0'):
         env.Append(CPPFLAGS=['-DHAS_PENDING_EXCEPTIONS'])
diff --git a/modules/mono/build_scripts/patches/fix-mono-android-pthread_mutexattr_setprotocol.diff b/modules/mono/build_scripts/patches/fix-mono-android-pthread_mutexattr_setprotocol.diff
new file mode 100644
index 0000000000..21cb1a0cf8
--- /dev/null
+++ b/modules/mono/build_scripts/patches/fix-mono-android-pthread_mutexattr_setprotocol.diff
@@ -0,0 +1,13 @@
+diff --git a/mono/utils/mono-os-mutex.h b/mono/utils/mono-os-mutex.h
+index e8039bf4094..ee39c0330b3 100644
+--- a/mono/utils/mono-os-mutex.h
++++ b/mono/utils/mono-os-mutex.h
+@@ -57,7 +57,7 @@ mono_os_mutex_init_type (mono_mutex_t *mutex, int type)
+ 	if (G_UNLIKELY (res != 0))
+ 		g_error ("%s: pthread_mutexattr_settype failed with \"%s\" (%d)", __func__, g_strerror (res), res);
+ 
+-#ifdef PTHREAD_PRIO_INHERIT
++#if defined(PTHREAD_PRIO_INHERIT) && __ANDROID_API__ >= 28
+ 	/* use PTHREAD_PRIO_INHERIT if possible */
+ 	res = pthread_mutexattr_setprotocol (&attr, PTHREAD_PRIO_INHERIT);
+ 	if (G_UNLIKELY (res != 0 && res != ENOTSUP))
diff --git a/modules/mono/build_scripts/patches/fix-mono-android-tkill.diff b/modules/mono/build_scripts/patches/fix-mono-android-tkill.diff
new file mode 100644
index 0000000000..05f8dcadcc
--- /dev/null
+++ b/modules/mono/build_scripts/patches/fix-mono-android-tkill.diff
@@ -0,0 +1,70 @@
+diff --git a/libgc/include/private/gcconfig.h b/libgc/include/private/gcconfig.h
+index e2bdf13ac3e..f962200ba4e 100644
+--- a/libgc/include/private/gcconfig.h
++++ b/libgc/include/private/gcconfig.h
+@@ -2255,6 +2255,14 @@
+ #   define GETPAGESIZE() getpagesize()
+ # endif
+ 
++#if defined(HOST_ANDROID) && !(__ANDROID_API__ >= 23) \
++    && ((defined(MIPS) && (CPP_WORDSZ == 32)) \
++        || defined(ARM32) || defined(I386) /* but not x32 */)
++  /* tkill() exists only on arm32/mips(32)/x86. */
++  /* NDK r11+ deprecates tkill() but keeps it for Mono clients. */
++# define USE_TKILL_ON_ANDROID
++#endif
++
+ # if defined(SUNOS5) || defined(DRSNX) || defined(UTS4)
+ 	    /* OS has SVR4 generic features.  Probably others also qualify.	*/
+ #   define SVR4
+diff --git a/libgc/pthread_stop_world.c b/libgc/pthread_stop_world.c
+index f93ce26b562..4a49a6d578c 100644
+--- a/libgc/pthread_stop_world.c
++++ b/libgc/pthread_stop_world.c
+@@ -336,7 +336,7 @@ void GC_push_all_stacks()
+ pthread_t GC_stopping_thread;
+ int GC_stopping_pid;
+ 
+-#ifdef HOST_ANDROID
++#ifdef USE_TKILL_ON_ANDROID
+ static
+ int android_thread_kill(pid_t tid, int sig)
+ {
+diff --git a/mono/metadata/threads.c b/mono/metadata/threads.c
+index ad9b8823f8f..3542b32b540 100644
+--- a/mono/metadata/threads.c
++++ b/mono/metadata/threads.c
+@@ -77,8 +77,12 @@ mono_native_thread_join_handle (HANDLE thread_handle, gboolean close_handle);
+ #include <zircon/syscalls.h>
+ #endif
+ 
+-#if defined(HOST_ANDROID) && !defined(TARGET_ARM64) && !defined(TARGET_AMD64)
+-#define USE_TKILL_ON_ANDROID 1
++#if defined(HOST_ANDROID) && !(__ANDROID_API__ >= 23) \
++    && ((defined(MIPS) && (CPP_WORDSZ == 32)) \
++        || defined(ARM32) || defined(I386) /* but not x32 */)
++  /* tkill() exists only on arm32/mips(32)/x86. */
++  /* NDK r11+ deprecates tkill() but keeps it for Mono clients. */
++# define USE_TKILL_ON_ANDROID
+ #endif
+ 
+ #ifdef HOST_ANDROID
+diff --git a/mono/utils/mono-threads-posix.c b/mono/utils/mono-threads-posix.c
+index 3e4bf93de5f..79c9f731fe7 100644
+--- a/mono/utils/mono-threads-posix.c
++++ b/mono/utils/mono-threads-posix.c
+@@ -31,8 +31,12 @@
+ 
+ #include <errno.h>
+ 
+-#if defined(HOST_ANDROID) && !defined(TARGET_ARM64) && !defined(TARGET_AMD64)
+-#define USE_TKILL_ON_ANDROID 1
++#if defined(HOST_ANDROID) && !(__ANDROID_API__ >= 23) \
++    && ((defined(MIPS) && (CPP_WORDSZ == 32)) \
++        || defined(ARM32) || defined(I386) /* but not x32 */)
++  /* tkill() exists only on arm32/mips(32)/x86. */
++  /* NDK r11+ deprecates tkill() but keeps it for Mono clients. */
++# define USE_TKILL_ON_ANDROID
+ #endif
+ 
+ #ifdef USE_TKILL_ON_ANDROID