android: Require NDK 23 and use default linker lld

Using lld instead of hard-coding ld.gold speeds up
linking liblo-native-code.so from about 40 seconds
to about 10 seconds for my x86 debug Android build with
NDK 23.2.8568313.

lld was added in NDK 21, made default in NDK 22 [1].

lld doesn't know the `--no-keep-files-mapped` option,
so drop that as well.

ld.gold had previously been hard-coded in

commit c6dadf5035c8e1c31dbd3fccec167bd4a906bf54
Date:   Fri Nov 1 17:57:17 2019 +0100

android: Fix linking of liblo-native-code.so on aarch64.

, but lld wasn't available yet back then.

To make sure that lld is used by default, NDK >= 22
has to be used.

In addition, due to a clang bug in NDK 22.1.7171670 [2]
("Misspelled -fnostack-clash-protection"), building for
aarch64 Android with that NDK version would fail as follows:

clang++: error: unknown argument '-fno-stack-clash-protection'; did you mean '-fnostack-clash-protection'?

clang++ version:

$ /home/michael.weghorn/Android/Sdk/ndk/22.1.7171670//toolchains/llvm/prebuilt/linux-x86_64/bin/clang++ --version
Android (7155654, based on r399163b1) clang version 11.0.5 (https://android.googlesource.com/toolchain/llvm-project 87f1315dfbea7c137aa2e6d362dbb457e388158d)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/michael.weghorn/Android/Sdk/ndk/22.1.7171670//toolchains/llvm/prebuilt/linux-x86_64/bin

Rather than work around that bug on LO side, require
NDK 23.x right away, since that provides a clang where this is
fixed.

Both, non-debug as well as `--enable-dbgutil` builds
with NDK version 23.2.8568313 were successfully tested
for all 4 supported architectures and these devices:

* aarch64: Fairphone 3 Plus, LineageOS 19 (Android 12), API 31
* arm32: Samsung Galaxy S4 I9505, LineageOS 17.1 (Android 10), API 29
* x86:
* AVD: Nexus 4, API 16
* AVD: Pixel 2, API 30
* x86_64: AVD: Pixel 2, API 33

[1] https://developer.android.com/ndk/downloads/revision_history
[2] https://bugs.llvm.org/show_bug.cgi?id=47139

Change-Id: I9ea714255faf29d50bb5f8e206f13495637da867
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/146119
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>

1 files changed, 1 insertions, 1 deletions

diff --git a/android/Bootstrap/Makefile.shared b/android/Bootstrap/Makefile.shared
index f9825b583c05..de7351f5e3f8 100644
--- a/android/Bootstrap/Makefile.shared
+++ b/android/Bootstrap/Makefile.shared
@@ -60,7 +60,7 @@ WHOLELIBS = \
 $(OBJLOCAL)/liblo-native-code.so : native-code.cxx $(ALL_STATIC_LIBS)
 	@echo "Linking $@"
 	mkdir -p $(OBJLOCAL)
-	$(CXX) -fuse-ld=gold -Wl,--build-id=sha1 -Wl,--gc-sections -Wl,--version-script=../Bootstrap/version.map -Wl,--no-keep-files-mapped -Wl,--no-undefined -DANDROID -DDISABLE_DYNLOADING -shared -Wl,-soname,liblo-native-code.so -o $(OBJLOCAL)/liblo-native-code.so -I$(BUILDDIR)/config_host -I$(SRCDIR)/include native-code.cxx -L$(INSTDIR)/$(LIBO_LIB_FOLDER) $(WHOLELIBS) $(LIBS) -lc++_static -lc++abi $(if $(filter-out arm64-v8a x86_64,$(ANDROID_APP_ABI)),-landroid_support) $(if $(filter armeabi-v7a,$(ANDROID_APP_ABI)),-lunwind) $(addprefix -l,$(NSSLIBS)) -lGLESv2 -landroid -ljnigraphics -llog -lz
+	$(CXX) -Wl,--build-id=sha1 -Wl,--gc-sections -Wl,--version-script=../Bootstrap/version.map -Wl,--no-undefined -DANDROID -DDISABLE_DYNLOADING -shared -Wl,-soname,liblo-native-code.so -o $(OBJLOCAL)/liblo-native-code.so -I$(BUILDDIR)/config_host -I$(SRCDIR)/include native-code.cxx -L$(INSTDIR)/$(LIBO_LIB_FOLDER) $(WHOLELIBS) $(LIBS) -lc++_static -lc++abi $(if $(filter-out arm64-v8a x86_64,$(ANDROID_APP_ABI)),-landroid_support) $(if $(filter armeabi-v7a,$(ANDROID_APP_ABI)),-lunwind) $(addprefix -l,$(NSSLIBS)) -lGLESv2 -landroid -ljnigraphics -llog -lz
 
 $(SODEST)/liblo-native-code.so : $(OBJLOCAL)/liblo-native-code.so
 	mkdir -p $(SODEST)