Add LunaSVG

Android/android-ndk-r27d/build/core/stl.mk

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+#
+# Copyright (C) 2023 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# Interprets APP_STL to configure default cflags/ldflags and install rules for
+# libc++ runtime libraries as necessary.
+
+ifneq (,$(call module_needs_clangxx,$(LOCAL_MODULE)))
+
+ifeq ($(APP_STL),none)
+LOCAL_CPPFLAGS += -nostdinc++
+LOCAL_LDFLAGS += -nostdlib++
+else ifeq ($(APP_STL),system)
+# TODO: Actually use the system STL headers for that mode or remove.
+#
+# I'm not sure how long this has been broken, but released NDKs do not use the
+# bionic C++ headers when APP_STL=system, they use the libc++ headers. That's
+# almost certainly unintentional.
+#
+# There may not actually be any compatibility issues with this because bionic's
+# libstdc++ only provides new and delete anyway (the rest of the behavior is
+# just headers that re-expose C APIs in the std namespace). We could choose to
+# delete bionic's headers and keep this "bug" instead.
+
+# LOCAL_CPPFLAGS += -stdlib=libstdc++
+# LOCAL_LDFLAGS += -stdlib=libstdc++
+
+# TODO: Remove when https://reviews.llvm.org/D55856 is merged.
+#
+# The system STL Android.mk will export -lstdc++, but the Clang driver will
+# helpfully rewrite -lstdc++ to whatever the default C++ stdlib linker
+# arguments are, except in the presence of -nostdlib and -nodefaultlibs.
+# That part of the driver does not account for -nostdlib++. We can fix the
+# behavior by using -stdlib=libstdc++ so it rewrites -lstdc++ to -lstdc++
+# instead of -lc++.
+LOCAL_LDFLAGS += -stdlib=libstdc++
+
+ifneq (,$(call module-has-c++-features,$(LOCAL_MODULE),rtti exceptions))
+	LOCAL_LDLIBS += -lc++abi
+endif
+
+else ifeq ($(APP_STL),c++_static)
+LOCAL_LDFLAGS += -static-libstdc++
+endif
+
+# Else c++_shared, and no flags are needed. Shared libc++ is the default
+# behavior for Android targets in Clang.
+#
+# Invalid values will be checked by ndk-stl-check.
+
+endif