add support libc++_shared stl on android

platform/android/SCsub

@@ -2,6 +2,8 @@
 
 import shutil
 from compat import open_utf8
+from distutils.version import LooseVersion
+from detect import get_ndk_version
 
 Import('env')
 
@@ -169,3 +171,7 @@ if lib_arch_dir != '':
 
     out_dir = '#platform/android/java/libs/' + lib_type_dir + '/' + lib_arch_dir
     env_android.Command(out_dir + '/libgodot_android.so', '#bin/libgodot' + env['SHLIBSUFFIX'], Move("$TARGET", "$SOURCE"))
+    ndk_version = get_ndk_version(env["ANDROID_NDK_ROOT"])
+    if ndk_version != None and LooseVersion(ndk_version) >= LooseVersion("15.0.4075724"):
+        stl_lib_path = str(env['ANDROID_NDK_ROOT']) + '/sources/cxx-stl/llvm-libc++/libs/' + lib_arch_dir + '/libc++_shared.so'
+        env_android.Command(out_dir + '/libc++_shared.so', stl_lib_path, Copy("$TARGET", "$SOURCE"))

platform/android/detect.py

@@ -204,18 +204,26 @@ def configure(env):
 
     ## Compile flags
 
+    if env['android_stl']:
+        env.Append(CPPFLAGS=["-isystem", env["ANDROID_NDK_ROOT"] + "/sources/cxx-stl/llvm-libc++/include"])
+        env.Append(CPPFLAGS=["-isystem", env["ANDROID_NDK_ROOT"] + "/sources/cxx-stl/llvm-libc++abi/include"])
+        env.Append(CXXFLAGS=['-frtti',"-std=gnu++14"])
+    else:
+        env.Append(CXXFLAGS=['-fno-rtti', '-fno-exceptions', '-DNO_SAFE_CAST'])
+
     ndk_version = get_ndk_version(env["ANDROID_NDK_ROOT"])
     if ndk_version != None and LooseVersion(ndk_version) >= LooseVersion("15.0.4075724"):
         print("Using NDK unified headers")
         sysroot = env["ANDROID_NDK_ROOT"] + "/sysroot"
-        env.Append(CPPFLAGS=["-isystem", sysroot + "/usr/include"])
+        env.Append(CPPFLAGS=["--sysroot="+sysroot])
         env.Append(CPPFLAGS=["-isystem", sysroot + "/usr/include/" + abi_subpath])
+        env.Append(CPPFLAGS=["-isystem", env["ANDROID_NDK_ROOT"] + "/sources/android/support/include"])
         # For unified headers this define has to be set manually
         env.Append(CPPFLAGS=["-D__ANDROID_API__=" + str(get_platform(env['ndk_platform']))])
     else:
         print("Using NDK deprecated headers")
         env.Append(CPPFLAGS=["-isystem", lib_sysroot + "/usr/include"])
-
+     
     env.Append(CPPFLAGS='-fpic -ffunction-sections -funwind-tables -fstack-protector-strong -fvisibility=hidden -fno-strict-aliasing'.split())
     env.Append(CPPFLAGS='-DNO_STATVFS -DGLES_ENABLED'.split())
 
@@ -246,23 +254,24 @@ def configure(env):
     env.Append(CPPFLAGS=target_opts)
     env.Append(CPPFLAGS=common_opts)
 
-    if env['android_stl']:
-        env.Append(CPPPATH=[env["ANDROID_NDK_ROOT"] + "/sources/cxx-stl/gnu-libstdc++/4.9/include"])
-        env.Append(CPPPATH=[env["ANDROID_NDK_ROOT"] + "/sources/cxx-stl/gnu-libstdc++/4.9/libs/" + arch_subpath + "/include"])
-        env.Append(LIBPATH=[env["ANDROID_NDK_ROOT"] + "/sources/cxx-stl/gnu-libstdc++/4.9/libs/" + arch_subpath])
-        env.Append(LIBS=["gnustl_static"])
-    else:
-        env.Append(CXXFLAGS=['-fno-rtti', '-fno-exceptions', '-DNO_SAFE_CAST'])
-
     ## Link flags
-
-    env['LINKFLAGS'] = ['-shared', '--sysroot=' + lib_sysroot, '-Wl,--warn-shared-textrel']
+    if ndk_version != None and LooseVersion(ndk_version) >= LooseVersion("15.0.4075724"):
+        if LooseVersion(ndk_version) >= LooseVersion("17.1.4828580"):
+            env.Append(LINKFLAGS=['-Wl,--exclude-libs,libgcc.a','-Wl,--exclude-libs,libatomic.a','-nostdlib++'])
+        env.Append(LINKFLAGS=['-shared', '--sysroot=' + lib_sysroot, '-Wl,--warn-shared-textrel'])
+        env.Append(LIBPATH=[env["ANDROID_NDK_ROOT"] + "/sources/cxx-stl/llvm-libc++/libs/"+arch_subpath+"/"])
+        env.Append(LINKFLAGS=[env["ANDROID_NDK_ROOT"] +"/sources/cxx-stl/llvm-libc++/libs/"+arch_subpath+"/libandroid_support.a"])
+        env.Append(LINKFLAGS=[env["ANDROID_NDK_ROOT"] +"/sources/cxx-stl/llvm-libc++/libs/"+arch_subpath+"/libc++_shared.so"])
+    else:
+        env.Append(LINKFLAGS=['-shared', '--sysroot=' + lib_sysroot, '-Wl,--warn-shared-textrel'])
+        if mt_link:
+            env.Append(LINKFLAGS=['-Wl,--threads'])
+            
     if env["android_arch"] == "armv7":
         env.Append(LINKFLAGS='-Wl,--fix-cortex-a8'.split())
     env.Append(LINKFLAGS='-Wl,--no-undefined -Wl,-z,noexecstack -Wl,-z,relro -Wl,-z,now'.split())
     env.Append(LINKFLAGS='-Wl,-soname,libgodot_android.so -Wl,--gc-sections'.split())
-    if mt_link:
-        env.Append(LINKFLAGS=['-Wl,--threads'])
+    
     env.Append(LINKFLAGS=target_opts)
     env.Append(LINKFLAGS=common_opts)